This document discusses a finite element model for predicting temperature distribution during surface grinding. It begins by reviewing how various grinding parameters affect temperature and approaches to modeling the grinding zone as a heat source. It then presents the proposed finite element model, which considers the grinding wheel a moving heat source along the workpiece surface. The model calculates the heat flux entering the workpiece based on grinding parameters like wheel speed and cutting depth. Results show maximum temperature occurs at the trailing edge but drops off after due to cooling. The model can provide insight into temperature fields in the workpiece and effects of process parameters on thermal loading and residual stresses.
Finite element modeling for maximum temperature in friction stir welding of a...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Theoretical investigations on standing wave thermoacoustic prime mover using ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
STRESS DISTRIBUTION IN GRINDING BY FINITE ELEMENT ANALYSISBijoy Das
This document discusses a finite element analysis of stress distribution during grinding. The analysis models the temperature distribution and resulting stresses in a titanium workpiece under different grinding conditions (dry, wet, wet with pneumatic barrier) and infeeds (10, 20, 30 microns). The model calculates heat flux, temperature, and stresses based on material properties, grinding power, and heat transfer considerations. Results show that temperature profiles and residual stresses vary significantly depending on grinding environment and infeed parameters. Wet grinding and lower infeed generate less tensile stress than dry grinding or higher infeed rates.
Optimization of wall thickness and material for minimum heat lossesIAEME Publication
This document discusses optimizing the wall thickness and materials of an induction furnace to minimize heat losses during iron melting. It begins by introducing induction furnaces and the need for optimization to reduce heat losses. It then details analyzing an existing furnace through calculations of theoretical heat loss and temperature distribution, which are compared to actual measured values showing significant losses. Finite element analysis software is used to optimize the thickness of refractory material, finding a 35% reduction in losses. Additionally, optimizing thermal properties reduces losses by 73%, allowing an overall 70% reduction through proper material thickness and properties.
This document analyzes and models single point cutting of an HSS material tool using ANSYS to optimize transient vibration parameters like temperature and pressure. It describes the tool geometry and material properties and performs a transient analysis in ANSYS applying different pressure loads over time. The results show maximum deformations, strains, and stresses remain below yield criteria, with safety factors all above 10.
This document summarizes a study on modeling material removal rate in electrical discharge machining (EDM) using finite element analysis. It describes developing an axisymmetric thermal model in ANSYS to simulate single sparks during EDM. Temperature distribution is analyzed using transient thermal analysis assuming Gaussian heat distribution. The model is validated by comparing material removal rates from experiments and simulations using the same process parameters. Good agreement between the two approaches is found.
IRJET- Numerical Analysis of Industrial Roll Cooling using FEMIRJET Journal
This document summarizes a numerical analysis of industrial roll cooling using the finite element method. A mathematical model was developed to predict the temperature distribution in work rolls under different cooling conditions. The model considers heat transfer in various zones, including the roll bite, water impingement zones, and water streaming zones. Validation shows the model can accurately reproduce measured roll temperature variations at different depths from the surface. The model is then applied to analyze the effects of spray nozzle position and water flow rate on roll temperatures and thermal strain. Optimizing these cooling parameters can improve roll performance.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Finite element modeling for maximum temperature in friction stir welding of a...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Theoretical investigations on standing wave thermoacoustic prime mover using ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
STRESS DISTRIBUTION IN GRINDING BY FINITE ELEMENT ANALYSISBijoy Das
This document discusses a finite element analysis of stress distribution during grinding. The analysis models the temperature distribution and resulting stresses in a titanium workpiece under different grinding conditions (dry, wet, wet with pneumatic barrier) and infeeds (10, 20, 30 microns). The model calculates heat flux, temperature, and stresses based on material properties, grinding power, and heat transfer considerations. Results show that temperature profiles and residual stresses vary significantly depending on grinding environment and infeed parameters. Wet grinding and lower infeed generate less tensile stress than dry grinding or higher infeed rates.
Optimization of wall thickness and material for minimum heat lossesIAEME Publication
This document discusses optimizing the wall thickness and materials of an induction furnace to minimize heat losses during iron melting. It begins by introducing induction furnaces and the need for optimization to reduce heat losses. It then details analyzing an existing furnace through calculations of theoretical heat loss and temperature distribution, which are compared to actual measured values showing significant losses. Finite element analysis software is used to optimize the thickness of refractory material, finding a 35% reduction in losses. Additionally, optimizing thermal properties reduces losses by 73%, allowing an overall 70% reduction through proper material thickness and properties.
This document analyzes and models single point cutting of an HSS material tool using ANSYS to optimize transient vibration parameters like temperature and pressure. It describes the tool geometry and material properties and performs a transient analysis in ANSYS applying different pressure loads over time. The results show maximum deformations, strains, and stresses remain below yield criteria, with safety factors all above 10.
This document summarizes a study on modeling material removal rate in electrical discharge machining (EDM) using finite element analysis. It describes developing an axisymmetric thermal model in ANSYS to simulate single sparks during EDM. Temperature distribution is analyzed using transient thermal analysis assuming Gaussian heat distribution. The model is validated by comparing material removal rates from experiments and simulations using the same process parameters. Good agreement between the two approaches is found.
IRJET- Numerical Analysis of Industrial Roll Cooling using FEMIRJET Journal
This document summarizes a numerical analysis of industrial roll cooling using the finite element method. A mathematical model was developed to predict the temperature distribution in work rolls under different cooling conditions. The model considers heat transfer in various zones, including the roll bite, water impingement zones, and water streaming zones. Validation shows the model can accurately reproduce measured roll temperature variations at different depths from the surface. The model is then applied to analyze the effects of spray nozzle position and water flow rate on roll temperatures and thermal strain. Optimizing these cooling parameters can improve roll performance.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Experimental investigation and stastical analysis of the friction welding par...eSAT Journals
This document summarizes an experimental investigation into optimizing friction welding parameters for copper alloy Cu Zn28 using the Taguchi method. Friction welding experiments were conducted varying rotational speed, friction pressure, friction time, and forging pressure. Tensile strength and microstructure were analyzed. The optimal parameters for maximum tensile strength were found to be: rotational speed of 1500 RPM, friction time of 5 seconds, friction pressure of 10 bar, and forging pressure of 30 bar. Friction time had the greatest influence on tensile strength based on analysis. Regression models were developed to predict tensile strength and upset based on the parameters. Microstructure analysis showed reduced grain size and no defects in the weld zone.
Finite Element Analysis of Single Point Cutting ToolIJMER
In this project, temperature at tool-tip interface is determined, generated in high-speed machining operations. Specifically, three different analyses are comparing to an experimental measurement of temperature in a machining process at slow speed, medium speed and at high speed. In addition, three analyses are done of a High Speed Steel and of a Carbide Tip Tool machining process at three different cutting speeds, in order to compare to experimental results produced as part of this study. An investigation of heat generation in cutting tool is performed by varying cutting parameters at the suitable cutting tool geometry. The experimental results reveal that the main factors responsible for increasing cutting temperature are cutting speed (v), feed rate (f), and depth of cut (d), respectively. It is also determined that change in cutting speed and depth of cut has the maximum effect on increasing cutting temperature. Various researches have been undertaken in measuring the temperatures generated during cutting operations. Investigators made attempt to measure these cutting temperatures with various techniques during machining.
In this project, “Fluke 62 max IR thermometer” (Range -40 0C to 650 0C) is used for measuring temperature at tool-tip interface. Single point cutting tool has been solid modeled by using CAD Modeler Pro/E and FEA carried out by using ANSYS Workbench 14.5. Experimental work is done at “Khushi Engineering”, Nagpur.
By varying various parameters the effect of those on temperature are compared with the experimental results and FEA results. After comparison nearly 4% variation is found in between the results.
IRJET - Stress Analysis of Solid Rocket Motor CaseIRJET Journal
This document discusses a stress analysis of a solid rocket motor case conducted using finite element analysis. The analysis studied the actual stress distributions in different parts of the rocket motor case. It was found that element size affects the results, but the effects level off after a particular size. Stresses in the cylindrical shell and hemispherical dome were analyzed. Stress analysis helps determine stresses at different points, which are difficult to calculate using empirical relations. The finite element software ANSYS was used to model the rocket motor case geometry and conduct the stress analysis.
Studies on material removal rate of al6061 while turning with coolant and wit...eSAT Journals
Abstract: Material Removal Rate (MRR) is one of the key attribute of machining process which influences productivity. In this work the effect of various turning process parameters on MRR produced on Al6061 (as cast condition) is investigated. Also, the effect of using coolant on MRR while turning is also determined. MRR is found to increase almost linearly with increase in feed rate. Increase in depth of cut and cutting speed is found to increase the MRR by 70.66 % and 16.36 % respectively. Keywords: Al6061, Material Removal Rate, Turning Process, Spindle Speed, Depth of Cut, ANOVA, Taguchi Method
This document summarizes a study on predicting creep life for gas turbine discs. Creep is an important design consideration for gas turbine components operating at high temperatures. The study models a typical gas turbine disc and analyzes temperature distribution, stresses, and creep strains using finite element analysis. An Inconel 718 disc is modeled and analyzed to determine creep life and emphasize creep considerations in gas turbine disc design. Thermal, stress, and creep analyses are performed to evaluate creep life and strains at different stress levels over time.
IRJET- Thermal Analysis of Heat Transfer through Composite Wall by using F.E....IRJET Journal
1) The document analyzes the thermal behavior of four composite wall materials using finite element analysis (FEA), analytical calculations, and experimental testing.
2) The composites analyzed are MS-Hylum-Wood, MS-Concrete-Fiber Glass, MS-Fiber Glass-Brick, and MS-Wood-Fiber Glass.
3) The study finds that FEA results closely match analytical calculations and experimental values. It also determines that the MS-Hylum-Wood composite has the lowest heat flux, temperatures, heat flow rate, and thermal conductivity compared to the other composites.
Investigation on effective thermal conductivity of foams using transient plan...eSAT Publishing House
The document describes an experimental setup used to determine the effective thermal conductivity of various foam materials (polyurethane foam, latex rubber foam, synthetic foam) using the transient plane heat source method. Thermal conductivity measurements were taken for each foam material at different concentrations (obtained by compressing the foam to different thicknesses). The results showed that increasing the concentration of the material (decreasing porosity) led to an increase in the effective thermal conductivity, as compressing the foam evacuated more of the low conductivity air pockets within the material.
International Journal of Computational Engineering Research (IJCER) ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology
Seismic Performance Study on RC ChimneyIRJET Journal
This study analyzes the seismic performance of a 180m tall reinforced concrete chimney using the SAP 2000 software. A parametric study is conducted to determine the effects of various parameters on the base shear and fundamental time period of the chimney. These parameters include the grade of concrete, wall thickness, top diameter, seismic zone, presence of openings, and soil type. The base shear and time period calculated from SAP 2000 are also compared to those obtained from the Indian code provisions. The results show that increasing the grade of concrete, thickness, top diameter, or soil stiffness decreases the base shear and time period, while more severe seismic zones or the addition of openings increases the seismic response of the chimney.
Investigations on the surface roughness produced in turning of al6061 (as cas...eSAT Journals
Abstract: Surface roughness produced on the machined component is one of the key attribute of machining process. In this work the effect of various turning process parameters on surface roughness produced on Al6061 (as cast condition) is investigated. Also the effect of using coolant on surface roughness while turning is also determined. It is observed increase in cutting speed by 39.29% resulted in decrease of surface roughness by 31.44%. Increase in feed rate and depth of cut leads to increase in surface roughness. Quantitative analysis of surface roughness obtained in machining with coolant and without coolant is also presented. Keywords: Al6061, Surface Roughness, Turning Process, Spindle Speed, Depth of Cut, ANOVA
Design of Micro Cooling Channel for Plastic Injection Moulding by using Mold ...IRJET Journal
This document describes research on designing micro cooling channels for plastic injection molds to improve cooling efficiency and reduce cycle times. It discusses heat transfer modes during molding and calculating cooling requirements. Methods include creating conformal micro channels near the mold surface using 3D printing. Simulations using Moldflow Advisor analyze different channel designs, showing micro channels provide more uniform cooling over smaller areas. The results indicate micro channels can reduce non-uniformity compared to standard channels, decreasing cycle times for plastic parts.
1) The document describes a study using DEFORM 3D software to simulate the cutting process and predict cutting edge temperatures.
2) The study varied cutting speed, feed rate, and depth of cut to determine the relationship between these parameters and the friction coefficient at the tool-chip interface.
3) The simulations found that the friction coefficient decreases with increasing cutting speed but increases with greater feed rates and depth of cut. Higher speeds and depths also led to higher interface temperatures.
Comparison of performance of coated carbide inserts with uncoated carbideIAEME Publication
The document compares the performance of coated and uncoated carbide inserts during turning of gray cast iron. Taguchi design of experiments was used to evaluate the effects of cutting speed, feed rate, and tool type (uncoated, TiCN coated, TiAlN coated) on surface roughness, tool wear, and material removal rate. Statistical analysis found tool type to be the most significant factor for surface roughness and tool wear. Coated inserts, especially TiAlN, performed better with lower surface roughness and wear compared to uncoated inserts. The interaction plots showed surface roughness increased at higher speeds and feeds for both coated and uncoated tools.
The document summarizes an experimental study that used Response Surface Methodology (RSM) to develop a model for predicting weld strength in CO2 arc welding of AISI 1022 steel plates. The study investigated how welding current, voltage, wire feed rate, and gas pressure affect weld strength. Central composite design was used to test various parameter combinations in 31 experimental runs. Regression analysis found that current, voltage, wire feed rate, and gas pressure significantly affect weld strength in linear terms. An RSM model was developed to predict weld strength as a function of the parameters. The model fits the experimental data with 98.8% accuracy.
Stress distribution in grinding by finite element analysisBijoy Das
This document discusses a finite element analysis of stress distribution during grinding. A model is developed to evaluate stress induced during surface grinding of titanium grade 1. Temperature distribution in the grinding zone is modeled, and heat flux entering the workpiece is calculated for dry, wet, and wet with pneumatic barrier conditions. Residual stresses are then computed based on thermal and structural loading. Results show that stress generated can be minimized by using coolant and controlling infeed rate, and that simulation of experimental findings is possible using this technique.
The document discusses finite element analysis (FEA) to model temperature distribution during the turning process. It begins with an introduction to turning and FEA modeling of machining processes. It then discusses heat generation zones in turning and methods for measuring temperatures, including thermocouples and pyrometers. The literature review covers previous research using FEA to study temperature, forces, stresses and strains in machining. The goal of the research is to develop an FEA simulation model to determine temperature distributions under different cutting conditions and tool materials.
This document summarizes a study on the tensile behavior of aluminum plates welded using friction stir welding. Various welding parameters like rotational speed, welding speed, and pin diameter were experimented with to weld an aluminum alloy. Mathematical models were developed using a statistical design of experiments approach to understand the effects of the parameters on tensile strength. It was found that tensile strength decreases with increasing rotational speed, increases with increasing welding speed, and decreases with increasing pin diameter. The maximum tensile strength was achieved at low rotational speed and high welding speed. Regression models for tensile strength were developed and validated to be adequate predictors within 95% confidence level.
TENSILE BEHAVIOUR OF ALUMINIUM PLATES (5083) WELDED BY FRICTION STIR WELDING IAEME Publication
Using arc welding, gas welding and other welding process, it is very difficult to weld the aluminum alloys. Friction stir welding, on the other hand, can be used to join most Al alloys and
better surface finishing is achieved. Although the work piece does heat up during friction stir weld, the temperature does not reach the melting point.
IJCER (www.ijceronline.com) International Journal of computational Engineerin...ijceronline
1. The study examines the transient temperature distribution in friction welded joints of stainless steel 304 and eutectoid steel using a numerical method.
2. Microstructure analysis found grain refinement in both steels after welding, with hardness decreasing closer to the weld interface due to thermal effects.
3. A numerical model was developed and solved using FORTRAN to calculate transient heating and cooling temperatures, showing peak temperatures of 613°C and 578°C for stainless steel and eutectoid steel respectively.
3 dimensional nonlinear finite element analysis of both thermal and mechanica...Alexander Decker
This document discusses a 3D finite element analysis of the thermal and mechanical response during friction stir welding of 2024-T3 aluminum plates. A coupled thermal-mechanical model is used to sequentially analyze the temperature distribution during welding and resulting thermal residual stresses. Both the heat input from the tool shoulder and pin are considered. The model predicts the highest tensile stresses occur in the longitudinal direction within the heat affected zone. Various process parameters are analyzed, including bottom surface heat transfer conditions and thermal contact conductance at interfaces. The results agree well with published experimental data.
Effect of different variables on heat transfer rate of four stroke si engine ...IAEME Publication
1. The document reviews research on factors that affect the heat transfer rate of fins on internal combustion engines. Increased fin thickness, larger numbers of fins, and higher fluid velocities can improve heat transfer but may also increase fuel consumption due to overcooling.
2. Material, geometry, perforations and notches, and environmental conditions also impact heat transfer. Copper fins perform better than aluminum but aluminum is more commonly used. Increased turbulence from modifications like perforations and notches can enhance heat transfer.
3. Computational fluid dynamics (CFD) simulations agree with experimental results and can be used to analyze different fin parameters, though overcooling at high velocities still needs to be addressed to reduce fuel consumption. Optimizing
A practical approach to design and optimization of single phase liquid to liq...iaemedu
The document describes the design and optimization of a shell and tube heat exchanger. It presents a method based on Tinker's approach that incorporates modifications from Kern and Kakac. A 17-step thermal design procedure is outlined that involves sizing the heat exchanger dimensions and components through an iterative process to meet a specified heat load. A computer program was developed to automate the calculations and optimize the design in a more efficient manner than manual calculations. The program allows the user to input parameters and obtain an optimized design solution.
Experimental investigation and stastical analysis of the friction welding par...eSAT Journals
This document summarizes an experimental investigation into optimizing friction welding parameters for copper alloy Cu Zn28 using the Taguchi method. Friction welding experiments were conducted varying rotational speed, friction pressure, friction time, and forging pressure. Tensile strength and microstructure were analyzed. The optimal parameters for maximum tensile strength were found to be: rotational speed of 1500 RPM, friction time of 5 seconds, friction pressure of 10 bar, and forging pressure of 30 bar. Friction time had the greatest influence on tensile strength based on analysis. Regression models were developed to predict tensile strength and upset based on the parameters. Microstructure analysis showed reduced grain size and no defects in the weld zone.
Finite Element Analysis of Single Point Cutting ToolIJMER
In this project, temperature at tool-tip interface is determined, generated in high-speed machining operations. Specifically, three different analyses are comparing to an experimental measurement of temperature in a machining process at slow speed, medium speed and at high speed. In addition, three analyses are done of a High Speed Steel and of a Carbide Tip Tool machining process at three different cutting speeds, in order to compare to experimental results produced as part of this study. An investigation of heat generation in cutting tool is performed by varying cutting parameters at the suitable cutting tool geometry. The experimental results reveal that the main factors responsible for increasing cutting temperature are cutting speed (v), feed rate (f), and depth of cut (d), respectively. It is also determined that change in cutting speed and depth of cut has the maximum effect on increasing cutting temperature. Various researches have been undertaken in measuring the temperatures generated during cutting operations. Investigators made attempt to measure these cutting temperatures with various techniques during machining.
In this project, “Fluke 62 max IR thermometer” (Range -40 0C to 650 0C) is used for measuring temperature at tool-tip interface. Single point cutting tool has been solid modeled by using CAD Modeler Pro/E and FEA carried out by using ANSYS Workbench 14.5. Experimental work is done at “Khushi Engineering”, Nagpur.
By varying various parameters the effect of those on temperature are compared with the experimental results and FEA results. After comparison nearly 4% variation is found in between the results.
IRJET - Stress Analysis of Solid Rocket Motor CaseIRJET Journal
This document discusses a stress analysis of a solid rocket motor case conducted using finite element analysis. The analysis studied the actual stress distributions in different parts of the rocket motor case. It was found that element size affects the results, but the effects level off after a particular size. Stresses in the cylindrical shell and hemispherical dome were analyzed. Stress analysis helps determine stresses at different points, which are difficult to calculate using empirical relations. The finite element software ANSYS was used to model the rocket motor case geometry and conduct the stress analysis.
Studies on material removal rate of al6061 while turning with coolant and wit...eSAT Journals
Abstract: Material Removal Rate (MRR) is one of the key attribute of machining process which influences productivity. In this work the effect of various turning process parameters on MRR produced on Al6061 (as cast condition) is investigated. Also, the effect of using coolant on MRR while turning is also determined. MRR is found to increase almost linearly with increase in feed rate. Increase in depth of cut and cutting speed is found to increase the MRR by 70.66 % and 16.36 % respectively. Keywords: Al6061, Material Removal Rate, Turning Process, Spindle Speed, Depth of Cut, ANOVA, Taguchi Method
This document summarizes a study on predicting creep life for gas turbine discs. Creep is an important design consideration for gas turbine components operating at high temperatures. The study models a typical gas turbine disc and analyzes temperature distribution, stresses, and creep strains using finite element analysis. An Inconel 718 disc is modeled and analyzed to determine creep life and emphasize creep considerations in gas turbine disc design. Thermal, stress, and creep analyses are performed to evaluate creep life and strains at different stress levels over time.
IRJET- Thermal Analysis of Heat Transfer through Composite Wall by using F.E....IRJET Journal
1) The document analyzes the thermal behavior of four composite wall materials using finite element analysis (FEA), analytical calculations, and experimental testing.
2) The composites analyzed are MS-Hylum-Wood, MS-Concrete-Fiber Glass, MS-Fiber Glass-Brick, and MS-Wood-Fiber Glass.
3) The study finds that FEA results closely match analytical calculations and experimental values. It also determines that the MS-Hylum-Wood composite has the lowest heat flux, temperatures, heat flow rate, and thermal conductivity compared to the other composites.
Investigation on effective thermal conductivity of foams using transient plan...eSAT Publishing House
The document describes an experimental setup used to determine the effective thermal conductivity of various foam materials (polyurethane foam, latex rubber foam, synthetic foam) using the transient plane heat source method. Thermal conductivity measurements were taken for each foam material at different concentrations (obtained by compressing the foam to different thicknesses). The results showed that increasing the concentration of the material (decreasing porosity) led to an increase in the effective thermal conductivity, as compressing the foam evacuated more of the low conductivity air pockets within the material.
International Journal of Computational Engineering Research (IJCER) ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology
Seismic Performance Study on RC ChimneyIRJET Journal
This study analyzes the seismic performance of a 180m tall reinforced concrete chimney using the SAP 2000 software. A parametric study is conducted to determine the effects of various parameters on the base shear and fundamental time period of the chimney. These parameters include the grade of concrete, wall thickness, top diameter, seismic zone, presence of openings, and soil type. The base shear and time period calculated from SAP 2000 are also compared to those obtained from the Indian code provisions. The results show that increasing the grade of concrete, thickness, top diameter, or soil stiffness decreases the base shear and time period, while more severe seismic zones or the addition of openings increases the seismic response of the chimney.
Investigations on the surface roughness produced in turning of al6061 (as cas...eSAT Journals
Abstract: Surface roughness produced on the machined component is one of the key attribute of machining process. In this work the effect of various turning process parameters on surface roughness produced on Al6061 (as cast condition) is investigated. Also the effect of using coolant on surface roughness while turning is also determined. It is observed increase in cutting speed by 39.29% resulted in decrease of surface roughness by 31.44%. Increase in feed rate and depth of cut leads to increase in surface roughness. Quantitative analysis of surface roughness obtained in machining with coolant and without coolant is also presented. Keywords: Al6061, Surface Roughness, Turning Process, Spindle Speed, Depth of Cut, ANOVA
Design of Micro Cooling Channel for Plastic Injection Moulding by using Mold ...IRJET Journal
This document describes research on designing micro cooling channels for plastic injection molds to improve cooling efficiency and reduce cycle times. It discusses heat transfer modes during molding and calculating cooling requirements. Methods include creating conformal micro channels near the mold surface using 3D printing. Simulations using Moldflow Advisor analyze different channel designs, showing micro channels provide more uniform cooling over smaller areas. The results indicate micro channels can reduce non-uniformity compared to standard channels, decreasing cycle times for plastic parts.
1) The document describes a study using DEFORM 3D software to simulate the cutting process and predict cutting edge temperatures.
2) The study varied cutting speed, feed rate, and depth of cut to determine the relationship between these parameters and the friction coefficient at the tool-chip interface.
3) The simulations found that the friction coefficient decreases with increasing cutting speed but increases with greater feed rates and depth of cut. Higher speeds and depths also led to higher interface temperatures.
Comparison of performance of coated carbide inserts with uncoated carbideIAEME Publication
The document compares the performance of coated and uncoated carbide inserts during turning of gray cast iron. Taguchi design of experiments was used to evaluate the effects of cutting speed, feed rate, and tool type (uncoated, TiCN coated, TiAlN coated) on surface roughness, tool wear, and material removal rate. Statistical analysis found tool type to be the most significant factor for surface roughness and tool wear. Coated inserts, especially TiAlN, performed better with lower surface roughness and wear compared to uncoated inserts. The interaction plots showed surface roughness increased at higher speeds and feeds for both coated and uncoated tools.
The document summarizes an experimental study that used Response Surface Methodology (RSM) to develop a model for predicting weld strength in CO2 arc welding of AISI 1022 steel plates. The study investigated how welding current, voltage, wire feed rate, and gas pressure affect weld strength. Central composite design was used to test various parameter combinations in 31 experimental runs. Regression analysis found that current, voltage, wire feed rate, and gas pressure significantly affect weld strength in linear terms. An RSM model was developed to predict weld strength as a function of the parameters. The model fits the experimental data with 98.8% accuracy.
Stress distribution in grinding by finite element analysisBijoy Das
This document discusses a finite element analysis of stress distribution during grinding. A model is developed to evaluate stress induced during surface grinding of titanium grade 1. Temperature distribution in the grinding zone is modeled, and heat flux entering the workpiece is calculated for dry, wet, and wet with pneumatic barrier conditions. Residual stresses are then computed based on thermal and structural loading. Results show that stress generated can be minimized by using coolant and controlling infeed rate, and that simulation of experimental findings is possible using this technique.
The document discusses finite element analysis (FEA) to model temperature distribution during the turning process. It begins with an introduction to turning and FEA modeling of machining processes. It then discusses heat generation zones in turning and methods for measuring temperatures, including thermocouples and pyrometers. The literature review covers previous research using FEA to study temperature, forces, stresses and strains in machining. The goal of the research is to develop an FEA simulation model to determine temperature distributions under different cutting conditions and tool materials.
This document summarizes a study on the tensile behavior of aluminum plates welded using friction stir welding. Various welding parameters like rotational speed, welding speed, and pin diameter were experimented with to weld an aluminum alloy. Mathematical models were developed using a statistical design of experiments approach to understand the effects of the parameters on tensile strength. It was found that tensile strength decreases with increasing rotational speed, increases with increasing welding speed, and decreases with increasing pin diameter. The maximum tensile strength was achieved at low rotational speed and high welding speed. Regression models for tensile strength were developed and validated to be adequate predictors within 95% confidence level.
TENSILE BEHAVIOUR OF ALUMINIUM PLATES (5083) WELDED BY FRICTION STIR WELDING IAEME Publication
Using arc welding, gas welding and other welding process, it is very difficult to weld the aluminum alloys. Friction stir welding, on the other hand, can be used to join most Al alloys and
better surface finishing is achieved. Although the work piece does heat up during friction stir weld, the temperature does not reach the melting point.
IJCER (www.ijceronline.com) International Journal of computational Engineerin...ijceronline
1. The study examines the transient temperature distribution in friction welded joints of stainless steel 304 and eutectoid steel using a numerical method.
2. Microstructure analysis found grain refinement in both steels after welding, with hardness decreasing closer to the weld interface due to thermal effects.
3. A numerical model was developed and solved using FORTRAN to calculate transient heating and cooling temperatures, showing peak temperatures of 613°C and 578°C for stainless steel and eutectoid steel respectively.
3 dimensional nonlinear finite element analysis of both thermal and mechanica...Alexander Decker
This document discusses a 3D finite element analysis of the thermal and mechanical response during friction stir welding of 2024-T3 aluminum plates. A coupled thermal-mechanical model is used to sequentially analyze the temperature distribution during welding and resulting thermal residual stresses. Both the heat input from the tool shoulder and pin are considered. The model predicts the highest tensile stresses occur in the longitudinal direction within the heat affected zone. Various process parameters are analyzed, including bottom surface heat transfer conditions and thermal contact conductance at interfaces. The results agree well with published experimental data.
Effect of different variables on heat transfer rate of four stroke si engine ...IAEME Publication
1. The document reviews research on factors that affect the heat transfer rate of fins on internal combustion engines. Increased fin thickness, larger numbers of fins, and higher fluid velocities can improve heat transfer but may also increase fuel consumption due to overcooling.
2. Material, geometry, perforations and notches, and environmental conditions also impact heat transfer. Copper fins perform better than aluminum but aluminum is more commonly used. Increased turbulence from modifications like perforations and notches can enhance heat transfer.
3. Computational fluid dynamics (CFD) simulations agree with experimental results and can be used to analyze different fin parameters, though overcooling at high velocities still needs to be addressed to reduce fuel consumption. Optimizing
A practical approach to design and optimization of single phase liquid to liq...iaemedu
The document describes the design and optimization of a shell and tube heat exchanger. It presents a method based on Tinker's approach that incorporates modifications from Kern and Kakac. A 17-step thermal design procedure is outlined that involves sizing the heat exchanger dimensions and components through an iterative process to meet a specified heat load. A computer program was developed to automate the calculations and optimize the design in a more efficient manner than manual calculations. The program allows the user to input parameters and obtain an optimized design solution.
This document summarizes a numerical study that examines the effects of fin spacing, fin material, and jet velocity on the heat transfer performance of plate fin heat sinks cooled by impinging air jets. The study considers fin spacings of 2mm, 3mm, and 4mm, and fin materials of aluminum, copper, and steel. Jet velocities of 5m/s, 10m/s, and 15m/s are examined. The results show that heat transfer rate increases with decreasing fin spacing, higher thermal conductivity fin materials like copper, and increasing jet velocity. Copper fins achieved the highest heat transfer rates but are heavier and more expensive than aluminum. A fin spacing of 2mm with aluminum fins and a jet velocity of 15
Problems of Heat, Mass and Momentum Transfer in Manufacturing Processes: A Br...drboon
In machining processes the chip flows over the tool rake and carries heat away as it moves. This is a case of mass transportation with heat transfer. Similarly, during hot forging, upsetting or coining processes heat is transferred from the hot billet to the relatively cooler dies, punches or hammers with momentum transfer under high impact load. Also, in high energy rate fabrication (HERF) processes, such as electromagnetic forming, explosive forming, impact extrusion, etc. heat is generated almost instantaneously, in milliseconds, and its dissipation is a serious industrial problem due to the very short process cycle time. In the present paper some of the problems related to heat, mass and momentum transfer in the above mentioned manufacturing processes are reviewed and compared with experimental results.
ANALYSIS OF RESIDUAL STRESSES AND DISTORTIONS IN TIG-WELDED STAINLESS STEEL P...IAEME Publication
In this article, the weld joint suffers various types of weld-induced residual stress fields (hoop and axial) and deformation patterns (axial shrinkage, radial shrinkage). In this paper Three dimensional finite element modeling of residual stresses in a tig-welded stainless steel pipe is presented with an emphasis on modeling procedures for the global residual stress characteristics. To precisely capture the distortions and residual stresses, computational methodology based on three dimensional finite element model for the simulation of gas tungsten elctrode gas inert gas welding in thin-walled pipe is presented.
This document summarizes a study that used finite element modeling to analyze residual stresses and distortions in tungsten inert gas (TIG)-welded stainless steel pipe. A three-dimensional finite element model was created to simulate the TIG welding process using sequentially coupled thermal and structural analyses. Temperature distributions, residual stresses, and distortions were computed and validated through experimental measurements. The simulations showed close correlation with experiments and captured non-axisymmetric effects, which simplified axisymmetric models cannot. The model aims to precisely predict welding distortions and stresses in thin-walled pipe joints.
EXPERIMENTAL INVESTIGATION OF CONVECTION HEAT TRANSFER FOR LAMINAR FLOW IN AN...IAEME Publication
The document summarizes an experimental investigation of convection heat transfer for laminar flow in an inclined annulus. An annular copper pipe was exposed to a constant heat flux and rotated through inclination angles from 0° to 90° in 10° increments. Results showed that the heat transfer coefficient decreased inversely with inclination angle, with a maximum 6.6% reduction at 90°. Reynolds number also decreased inversely with angle from 1750 to 1700. Experimental results closely matched a correlation up to 40° inclination. The study analyzed the effect of inclination angle on heat transfer in laminar flow through an annulus.
The document summarizes an experimental investigation of convection heat transfer for laminar flow in an inclined annulus. An annular copper pipe was exposed to a constant heat flux and rotated through inclination angles from 0° to 90° in 10° increments. Results showed that the heat transfer coefficient decreased inversely with inclination angle, with a maximum 6.6% reduction at 90°. Reynolds number also decreased inversely with angle from 1750 to 1700. Experimental results closely matched a correlation up to 40° inclination. The study found inclination angle had a small effect on heat transfer for laminar flow in the annulus.
Effect of Process Parameters on the Total Heat Damaged Zone (HDZ) during Micr...IJAMSE Journal
In micro electrical discharge machining, three subsurface layersare formed on the workpiece, they are; recast zone, heat affected zone and converted zone, primarily due to heating-quenching cycles. The HDZ in micro-EDM is characterized by cracks and weakness in the grain boundary and thermal residual stresses. This paper presents the effect of process parameters on the HDZ in micro-EDM of plastic mold steel 1.2738. As the energy of the sparks increases, the thickness of the HDZ increases and the average coefficient of correlation between energy and HDZ considering three different sections of the zone is 0.8099. Therefore, the effect of process parameters governing the discharge energy are analyzed; they are: average current (Ia), peak current (Ip) and pulse ‘on-time’ (Ton). An overall increase in heat-damaged zone thickness by 105% is observed with an increase in pulse on time.
MODELING AND EXPERIMENTAL STUDY OF THERMAL/ WEAR BEHAVIOR IN CAST IRON TURNIN...IAEME Publication
The present works involves the study of thermal and wear behaviour of tool and work interface. Experiments were conducted on a precision centre lathe and cutting forces, temperature at tool tip, thickness and weight of Chips
formed during machining along with tool wear data were recorded. The influence of cutting parameters was studied.
Based on the main effects plots obtained. Finite element analysis was done using ANSYS software tool and was used to
find the tool tip deflection, counterplots. Thermal analysis was done to determine the temperature distribution over
machining interface.
NUMERICAL AND EXPERIMENTAL VALIDATION OF CHIP MORPHOLOGYIAEME Publication
The extensive research studies are used to divination the behavior of complex
Metal cutting processes. The cutting parameters such as speed, feed and force play
important role on conform chip morphology. The experimental techniques for
investigation the chip morphology is expensive and time consuming. To overcome
these difficulties Finite element modeling and simulation process are used as effective
tool to divination the effect of cutting variables. In the present study FEA simulation
process model is developed to divination the chip morphology and cutting forces in
turning of Al-6061 with WC tool. Johnson cook material models are considered for
visco-elastic material behavior. The obtained simulation process results are compared
with experimental process results
NUMERICAL AND EXPERIMENTAL VALIDATION OF CHIP MORPHOLOGYIAEME Publication
The extensive research studies are used to divination the behavior of complex
Metal cutting processes. The cutting parameters such as speed, feed and force play
important role on conform chip morphology. The experimental techniques for
investigation the chip morphology is expensive and time consuming. To overcome
these difficulties Finite element modeling and simulation process are used as effective
tool to divination the effect of cutting variables. In the present study FEA simulation
process model is developed to divination the chip morphology and cutting forces in
turning of Al-6061 with WC tool. Johnson cook material models are considered for
visco-elastic material behavior. The obtained simulation process results are compared
with experimental process results
THERMAL ANALYSIS OF HEAT SINK (VARIABLE SHIELD PROFILE) USED IN ELECTRONIC CO...IAEME Publication
This paper deals with the comparative study of heat sink having fins with shield of various profiles namely Trapezoidal with curved and plane inclination and slope shield as heat sinks are the commonly used devices for enhancing heat transfer in electronic components. For the purpose of study heat sink is modeled by using the optimal geometric parameter such as fin height, fin thickness, base height, fin pitch as 48 mm, 1.6 mm, 8mm, 4mm and after that simulation is done at
heat load of 75W and with a air velocity of 4.7171m/s and air inlet temperature is taken as 295 K. The simulation is carried out with a commercial package provided by fluent incorporation.
This document presents a computational fluid dynamics (CFD) analysis of different heat sink shield profiles for electronic cooling. Three shield profiles - trapezoidal with curved inclination, trapezoidal with plane inclination, and slope shield - were modeled and simulated under a heat load of 75W. The trapezoidal shield with curved inclination achieved the lowest maximum temperature of 325.58K, highest heat transfer coefficient of 29.32, and highest surface Nusselt number of 1211.604, indicating it has the best thermal performance of the three profiles analyzed.
Similar to Model for prediction of temperature distribution in workpiece for surface grinding using fea (20)
Tech transfer making it as a risk free approach in pharmaceutical and biotech iniaemedu
Tech transfer is a common methodology for transferring new products or an existing
commercial product to R&D or to another manufacturing site. Transferring product knowledge to the
manufacturing floor is crucial and it is an ongoing approach in the pharmaceutical and biotech
industry. Without adopting this process, no company can manufacture its niche products, let alone
market them. Technology transfer is a complicated, process because it is highly cross functional. Due
to its cross functional dependence, these projects face numerous risks and failure. If anidea cannot be
successfully brought out in the form of a product, there is no customer benefit, or satisfaction.
Moreover, high emphasis is in sustaining manufacturing with highest quality each and every time. It
is vital that tech transfer projects need to be executed flawlessly. To accomplish this goal, risk
management is crucial and project team needs to use the risk management approach seamlessly.
Integration of feature sets with machine learning techniquesiaemedu
This document summarizes a research paper that proposes a novel approach for spam filtering using selective feature sets combined with machine learning techniques. The paper presents an algorithm and system architecture that extracts feature sets from emails and uses machine learning to classify emails and generate rules to identify spam. Several metrics are identified to evaluate the efficiency of the feature sets, including false positive rate. An experiment is described that uses keyword lists as feature sets to train filters and compares the proposed approach to other spam filtering methods.
Effective broadcasting in mobile ad hoc networks using gridiaemedu
This document summarizes a research paper that proposes a new grid-based broadcasting mechanism for mobile ad hoc networks. The paper argues that flooding approaches to broadcasting are inefficient and cause network congestion. The proposed approach divides the network into a hierarchical grid structure. When a node needs to broadcast a message, it sends the message to the first node in the appropriate grid, which is then responsible for updating and forwarding the message within that grid. Simulation results showed the grid-based approach outperformed other broadcasting protocols and was more reliable, efficient and scalable.
Effect of scenario environment on the performance of mane ts routingiaemedu
The document analyzes the effect of scenario environment on the performance of the AODV routing protocol in mobile ad hoc networks (MANETs). It studies AODV performance under different scenarios varying network size, maximum node speed, and pause time. The performance is evaluated based on packet delivery ratio, throughput, and end-to-end delay. The results show that AODV performs best in some scenarios and worse in others, indicating that scenario parameters significantly impact routing protocol performance in MANETs.
Adaptive job scheduling with load balancing for workflow applicationiaemedu
This document discusses adaptive job scheduling with load balancing for workflow applications in a grid platform. It begins with an abstract that describes grid computing and how scheduling plays a key role in performance for grid workflow applications. Both static and dynamic scheduling strategies are discussed, but they require high scheduling costs and may not produce good schedules. The paper then proposes a novel semi-dynamic algorithm that allows the schedule to adapt to changes in the dynamic grid environment through both static and dynamic scheduling. Load balancing is incorporated to handle situations where jobs are delayed due to resource fluctuations or overloading of processors. The rest of the paper outlines the related works, proposed scheduling algorithm, system model, and evaluation of the approach.
This document summarizes research on transaction reordering techniques. It discusses transaction reordering approaches based on reducing resource conflicts and increasing resource sharing. Specifically, it covers:
1) A "steal-on-abort" technique that reorders an aborted transaction behind the transaction that caused the abort to avoid repeated conflicts.
2) A replication protocol that attempts to reorder transactions during certification to avoid aborts rather than restarting immediately.
3) Transaction reordering and grouping during continuous data loading to prevent deadlocks when loading data for materialized join views.
The document discusses semantic web services and their challenges. It provides an overview of semantic web technologies like WSDL, SOAP, UDDI, and OIL which are used to build semantic web services. The semantic web architecture adds semantics to web services through ontologies written in OWL and DAML+OIL. Key approaches to semantic web services include annotation, composition, and addressing privacy and security. However, semantic web services still face challenges in achieving their full potential due to issues in representation, reasoning, and a lack of real-world applications and data.
Website based patent information searching mechanismiaemedu
This document summarizes a research paper on developing a website-based patent information searching mechanism. It discusses how patent information can be used for technology development, rights acquisition and utilization, and management information. It describes different types of patent searches including novelty, validity, infringement, and state-of-the-art searches. It also evaluates and compares two major patent websites, Delphion and USPTO, in terms of their search capabilities and features.
Revisiting the experiment on detecting of replay and message modificationiaemedu
This document summarizes a research paper that proposes methods for detecting message modification and replay attacks in ad-hoc wireless networks. It begins with background on security issues in wireless networks and types of attacks. It then reviews existing intrusion detection systems and security techniques. Related work that detects attacks using features from the media access control layer or radio frequency fingerprinting is also discussed. The paper aims to present a simple, economical, and platform-independent system for detecting message modification, replay attacks, and unauthorized users in ad-hoc networks.
1) The document discusses the Cyclic Model Analysis (CMA) technique for sequential pattern mining which aims to predict customer purchasing behavior.
2) CMA calculates the Trend Distribution Function from sequential patterns to model purchasing trends over time. It then uses Generalized Periodicity Detection and Trend Modeling to identify periodic patterns and construct an approximating model.
3) The Cyclic Model Analysis algorithm is applied to further analyze the patterns, dividing the domain into segments where the distribution function is increasing or decreasing and applying the other techniques recursively to fully model the cyclic behavior.
Performance analysis of manet routing protocol in presenceiaemedu
This document analyzes the performance of different routing protocols in a mobile ad hoc network (MANET) under hybrid traffic conditions. It simulates a MANET with 50 nodes moving at speeds up to 20 m/s using the AODV, DSDV, and DSR routing protocols. Traffic included both constant bit rate and variable bit rate sources. Results found that AODV had lower average end-to-end delay and higher packet delivery ratios than DSDV and DSR as the percentage of variable bit rate traffic increased. AODV also performed comparably under both low and high node mobility scenarios with hybrid traffic.
Performance measurement of different requirements engineeringiaemedu
This document summarizes a research paper that compares the performance of different requirements engineering (RE) process models. It describes three RE process models - two existing linear models and the authors' iterative model. It also reviews literature on common RE activities and issues with descriptive models not reflecting real-world practices. The authors conducted interviews at two Indian companies to model their RE processes and compare them to the three models. They found the existing linear models did not fully capture the iterative nature of observed RE processes.
This document proposes a mobile safety system for automobiles that uses Android operating system. The system has two main components: a safety device and an automobile base unit. The safety device allows users to monitor the vehicle's location on a map, check its status, and control functions remotely. It communicates with the base unit in the vehicle using GPRS. The base unit collects data from sensors, determines the vehicle's GPS location, and can execute control commands like activating the brakes or switching off the engine. The document provides details on the design and algorithms of both components and includes examples of Java code implementation. The goal is to create an intelligent, secure and easy-to-use mobile safety system for vehicles using embedded systems and Android
Efficient text compression using special character replacementiaemedu
The document describes a proposed algorithm for efficient text compression using special character replacement and space removal. The algorithm replaces words with non-printable ASCII characters or combinations of characters to compress text files. It uses a dynamic dictionary to map words to their symbols. Spaces are removed from the compressed file in some cases to further reduce file size. Experimental results show the algorithm achieves better compression ratios than LZW, WinZip 10.0 and WinRAR 3.93 for various text file types while allowing lossless decompression.
The document discusses agile programming and proposes a new methodology. It provides an overview of existing agile methodologies like Scrum and Extreme Programming. Scrum uses short sprints to define tasks and deadlines. Extreme Programming focuses on practices like test-first development, pair programming, and continuous integration. The document notes drawbacks like an inability to support large or multi-site projects. It proposes designing a new methodology that combines the advantages of existing methods while overcoming their deficiencies.
Adaptive load balancing techniques in global scale grid environmentiaemedu
The document discusses various adaptive load balancing techniques for distributed applications in grid environments. It first describes adaptive mesh refinement algorithms that partition computational domains using space-filling curves or by distributing grids independently or at different levels. It also discusses dynamic load balancing using tiling and multi-criteria geometric partitioning. The document then covers repartitioning algorithms based on multilevel diffusion and the adaptive characteristics of structured adaptive mesh refinement applications. Finally, it discusses adaptive workload balancing on heterogeneous resources by benchmarking resource characteristics and estimating application parameters to find optimal load distribution.
A survey on the performance of job scheduling in workflow applicationiaemedu
This document summarizes a survey on job scheduling performance in workflow applications on grid platforms. It discusses an adaptive dual objective scheduling (ADOS) algorithm that takes both completion time and resource usage into account for measuring schedule performance. The study shows ADOS delivers good performance in completion time, resource usage, and robustness to changes in resource performance. It also describes the system architecture used, which includes a planner and executor component. The planner focuses on scheduling to minimize completion time while considering resource usage, and can reschedule if needed. The executor enacts the schedule on the grid resources.
A survey of mitigating routing misbehavior in mobile ad hoc networksiaemedu
This document summarizes existing methods to detect misbehavior in mobile ad hoc networks (MANETs). It discusses how routing protocols assume nodes will cooperate fully, but misbehavior like packet dropping can occur. It describes several techniques to detect misbehavior, including watchdog, ACK/SACK, TWOACK, S-TWOACK, and credit-based/reputation-based schemes. Credit-based schemes use virtual currencies to provide incentives for nodes to forward packets, while reputation-based schemes track nodes' past behaviors. The document aims to survey approaches for mitigating the impact of misbehaving nodes in MANET routing.
A novel approach for satellite imagery storage by classifyiaemedu
This document presents a novel approach for classifying and storing satellite imagery by detecting and storing only non-duplicate regions. It uses kernel principal component analysis to reduce the dimensionality and extract features of satellite images. Fuzzy N-means clustering is then used to segment the images into blocks. A duplication detection algorithm compares blocks to identify duplicate and non-duplicate regions. Only the non-duplicate regions are stored in the database, improving storage efficiency and updating speed compared to completely replacing existing images. Support vector machines are used to categorize the non-duplicate blocks into the appropriate classes in the existing images.
A self recovery approach using halftone images for medical imageryiaemedu
This document summarizes a proposed approach for securely transferring medical images over the internet using visual cryptography and halftone images. The approach uses error diffusion techniques to generate a halftone host image from the grayscale medical image. Shadow images are then created from the halftone host image using visual cryptography algorithms. When stacked together, the shadow images reveal the secret medical image. The halftone host image also contains an embedded logo that can be extracted to verify the integrity of the reconstructed image without a trusted third party.