International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Introduction to Magneto-Rheological Fluid Technology & Its Applicationijiert bestjournal
Magnetorheological (MR) fluid damper are semi active control device that have been applied
a wide range of practical vibration control application. In this study, the methodology adopted
to get a control structure is based on the experimental results. An Experiment has been
conducted to establish the behaviour of the MR damper. In this paper, the behaviour of MR
damper is studied and used in implementing vibration control. The force displacement and
force‐velocity response with varying current has been established for the MR damper. In this
paper we investigated theoretically at fabricated Magnetorheological damper by using
Magnetorheological fluid. Here MR fluid developed first by mixing of prepared nano size
(fe3o4) iron particle by co precipitation method. And a comparative study had done between
these iron particles prepared MR fluid. Here an experimental performed on fabricated MR
damper and discussed the behaviour of MR damper.
Electrical resistivity data interpretation for groundwater detection in titta...eSAT Journals
Abstract The present study aims to detect the groundwater potential in Tittagudi Taluk of Cuddalore District, Tamil Nadu, India using electrical measurement. Electric resistivity data interpretation was carried out using Schlumberger configuration with electrode spacing (AB/2) of 100 m distance. The VES was calculated by multiplying the resistance by constant obtained from the Schlumberger formula. The resistivity curves were analysed with curve matching techniques along with the help of computer programme. The sub-surface lithology was evaluated and correlated with the available borehole data. The results of quantitative interpretation of geoelectrical data indicated that the layer system having minimum of two layers to a maximum of eight layers in the area. The low and high resistivities obtained are ranging from 0.5 to 27755 ohm/m respectively. Majority of resistivity curves are falling in ‘A’ type. The contact zone of sedimentary and crystalline rock formations are clearly delineated on Northeast to Southwest directions along Sirumangalam, Agaram and Sirumalai habitations. The prominent low resistivity anomaly observed in and around Adari area (VES. 03), this have been encountered in all the iso-resistivity contour maps, indicating that, a trend of structural elements like a weaker zone or lineament or fracture occurred in NE direction of the study area which may be a favorable zone for targeting groundwater. Key words: Electrical Measurements, Tittagudi Taluk, Schulmberger Configuration And Iso-Resistivity Maps.
Impact of Buried Conductor Length on Computation of Earth Grid ResistanceIJAPEJOURNAL
Effective design of substation earth grid implies achieving low earth grid resistance and fulfillment of the safety criteria at the lowest possible cost. This paper presents an evaluation of IEEE Standard 80-2000 Equations 50 to 52 to determine the impact of buried conductor length on computation of earth grid resistance. Calculated results indicated that a saturation point is reached beyond which further addition of more conductor length does not significantly reduce the earth grid resistance but incurs more economic implications. These were validated by earth grids designed using CDEGS where good agreement between the calculated and simulated results was found.
Load centers get generated electricity from power
stations that are usually far; uninterrupted consumption or usage
of power has increased in last few years. Transmission system is
the system by means of which electricity is transferred from place
of generation to the consumers. Overhead wires or conductors
are the medium used for transmission of power. These wires are
visible to wind, heat and ice. The efficiency of the power system
increases if the losses of these overhead wires are minimal. These
losses are based on the resistive, magnetic and capacitive nature
of the conductor. It is necessary to create or make proper design
of these conductors accompanied by proper installation. To
balance the working and strength of overhead transmission line
and to minimize its capacitive effect the conductors must be
installed in catenary shape. The sag is required in transmission
line for conductor suspension. The conductors are appended
between two overhead towers with ideal estimation of sag. It is
because of keeping conductor safety from inordinate tension. To
permit safe tension in the conductor, conductors are not
completely extended; rather they are allowed to have sag. For
same level supports this paper provides sag and tension
estimation with different wind speeds under low operating
temperature 2 °C. To calculate sag-tension estimation of ACSR
(Aluminum Conductor Steel Reinforced) overhead lines three
different cases are provided with normal and high wind speed
effects. Four different span lengths are taken for equal level
supports. ETAP (Electrical Transient and Analysis Program) is
used for simulation setup. The results shows that wind speed has
great impact upon line tension and with addition of wind speed
the sag of line remains unaltered while tension changes.
Moreover tension gets increase while increase in wind speed.
Introduction to Magneto-Rheological Fluid Technology & Its Applicationijiert bestjournal
Magnetorheological (MR) fluid damper are semi active control device that have been applied
a wide range of practical vibration control application. In this study, the methodology adopted
to get a control structure is based on the experimental results. An Experiment has been
conducted to establish the behaviour of the MR damper. In this paper, the behaviour of MR
damper is studied and used in implementing vibration control. The force displacement and
force‐velocity response with varying current has been established for the MR damper. In this
paper we investigated theoretically at fabricated Magnetorheological damper by using
Magnetorheological fluid. Here MR fluid developed first by mixing of prepared nano size
(fe3o4) iron particle by co precipitation method. And a comparative study had done between
these iron particles prepared MR fluid. Here an experimental performed on fabricated MR
damper and discussed the behaviour of MR damper.
Electrical resistivity data interpretation for groundwater detection in titta...eSAT Journals
Abstract The present study aims to detect the groundwater potential in Tittagudi Taluk of Cuddalore District, Tamil Nadu, India using electrical measurement. Electric resistivity data interpretation was carried out using Schlumberger configuration with electrode spacing (AB/2) of 100 m distance. The VES was calculated by multiplying the resistance by constant obtained from the Schlumberger formula. The resistivity curves were analysed with curve matching techniques along with the help of computer programme. The sub-surface lithology was evaluated and correlated with the available borehole data. The results of quantitative interpretation of geoelectrical data indicated that the layer system having minimum of two layers to a maximum of eight layers in the area. The low and high resistivities obtained are ranging from 0.5 to 27755 ohm/m respectively. Majority of resistivity curves are falling in ‘A’ type. The contact zone of sedimentary and crystalline rock formations are clearly delineated on Northeast to Southwest directions along Sirumangalam, Agaram and Sirumalai habitations. The prominent low resistivity anomaly observed in and around Adari area (VES. 03), this have been encountered in all the iso-resistivity contour maps, indicating that, a trend of structural elements like a weaker zone or lineament or fracture occurred in NE direction of the study area which may be a favorable zone for targeting groundwater. Key words: Electrical Measurements, Tittagudi Taluk, Schulmberger Configuration And Iso-Resistivity Maps.
Impact of Buried Conductor Length on Computation of Earth Grid ResistanceIJAPEJOURNAL
Effective design of substation earth grid implies achieving low earth grid resistance and fulfillment of the safety criteria at the lowest possible cost. This paper presents an evaluation of IEEE Standard 80-2000 Equations 50 to 52 to determine the impact of buried conductor length on computation of earth grid resistance. Calculated results indicated that a saturation point is reached beyond which further addition of more conductor length does not significantly reduce the earth grid resistance but incurs more economic implications. These were validated by earth grids designed using CDEGS where good agreement between the calculated and simulated results was found.
Load centers get generated electricity from power
stations that are usually far; uninterrupted consumption or usage
of power has increased in last few years. Transmission system is
the system by means of which electricity is transferred from place
of generation to the consumers. Overhead wires or conductors
are the medium used for transmission of power. These wires are
visible to wind, heat and ice. The efficiency of the power system
increases if the losses of these overhead wires are minimal. These
losses are based on the resistive, magnetic and capacitive nature
of the conductor. It is necessary to create or make proper design
of these conductors accompanied by proper installation. To
balance the working and strength of overhead transmission line
and to minimize its capacitive effect the conductors must be
installed in catenary shape. The sag is required in transmission
line for conductor suspension. The conductors are appended
between two overhead towers with ideal estimation of sag. It is
because of keeping conductor safety from inordinate tension. To
permit safe tension in the conductor, conductors are not
completely extended; rather they are allowed to have sag. For
same level supports this paper provides sag and tension
estimation with different wind speeds under low operating
temperature 2 °C. To calculate sag-tension estimation of ACSR
(Aluminum Conductor Steel Reinforced) overhead lines three
different cases are provided with normal and high wind speed
effects. Four different span lengths are taken for equal level
supports. ETAP (Electrical Transient and Analysis Program) is
used for simulation setup. The results shows that wind speed has
great impact upon line tension and with addition of wind speed
the sag of line remains unaltered while tension changes.
Moreover tension gets increase while increase in wind speed.
Vibration suppression is considered as a keyresearch field in civil engineering to ensure the safety and comfort of their occupants and users of mechanical structures. To reduce the system vibration, an effective vibration control with isolation is necessary. Vibration control techniques have classically been categorized into two areas, passive and active controls. For a long time, efforts were made to make the suspension system work optimally by optimizing its parameters, but due to the intrinsic limitations of a passive suspension system, improvements were effective only in a certain frequency range. Compared with passive suspensions, active suspensions can improve the performance of the suspension system over a wide range of frequencies. Semi-active suspensions were proposed in the early 1970s [1], and can be nearly as effective as active suspensions. When the control system fails, the semi-active suspension can still work under passive condition
Vibration suppression is considered as a keyresearch field in civil engineering to ensure the safety and comfort of their occupants and users of mechanical structures. To reduce the system vibration, an effective vibration control with isolation is necessary. Vibration control techniques have classically been categorized into two areas, passive and active controls. For a long time, efforts were made to make the suspension system work optimally by optimizing its parameters, but due to the intrinsic limitations of a passive suspension system, improvements were effective only in a certain frequency range. Compared with passive suspensions, active suspensions can improve the performance of the suspension system over a wide range of frequencies. Semi-active suspensions were proposed in the early 1970s [1], and can be nearly as effective as active suspensions. When the control system fails, the semi-active suspension can still work under passive condition
International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Investigation on Magnetorheological Damper for Its Various ApplicationsIJLT EMAS
Magneto Rheological damper is a special type of
damper that is filled with Magnetorheological fluids which can
be controlled by magnetic field using an electromagnet. These
types of smart fluids change their physical properties when
subjected to magnetic field and turn into visco-elastic solids in
few milliseconds. This property allows the MR damper to be
used as a shock absorber by controlling its damping
characteristics by changing the intensity of electromagnet. This
paper focuses on the various applications of MR dampers in
latest technologies
Design and Testing of Magneto Rheological Damper for Vehicle SuspensionNagesh NARASIMHA PRASAD
Conventional suspension systems have been ruling the automobile industry since ages but with the advancement in material technology it has led us to a new kind of suspension systems known as Active Suspension systems which involves smart materials like Magneto Rheological Fluids (MR), Electro Rheological Fluids (ER) etc. In present day conventional suspension system, we have a coiled spring setup with a simple damper filled with oil in motorcycles which are passive in nature. But off late in 21st century the development of smart materials bought in new dimensions of research in the suspension technology which has led to the era of active suspension systems. Now we can see usage of Semi Active Suspension/Active suspension system in cars and heavy vehicles which enhances the life of automobile, ride comfort and drive control. Though these systems have been developed for high end cars and military vehicles, the implementation of this technology to motorcycles has been a topic of research interest to various motorcycle industries.
We hence designed and machined an Magneto-Rheological Damper to Motorcycles, this system senses the irregularities of the road with various sensors and tries to stiffen and soften the suspension system in motorcycles in turn providing safe and snuggly ride with increased control during rough terrain. Thereby with this suggested concept an alternative design consideration of suspension systems has been offered.
Performance evaluation of Magnetic circuit for M.R. Fluid Damper using F.E.MIDES Editor
The primary purpose of this study is to evaluate and
understand the performance of the Magnetic -Rheological
(MR) damper. It is known that its performance depends upon
the magnetic and hydraulic circuit design. These dampers
are generally used to control the vibrations in various
applications. This work deals with design of an MR damper
for which mathematical model is developed. A finite element
model is built to analyze and investigate the performance of
2-D axi-symmetric MR damper. Various configurations of
damper piston with different number of turns and pole lengths
are simulated. Further, the piston ends of the selected
configuration are modified and investigated. The input current
to the coil and the piston velocity are varied to evaluate the
resulting change in magnetic Field Intensity (H) and damping
Force. The simulation results of the various configurations of
damper show that the performance of filleted piston ends is
superior to that of other configurations for the same magnitude
of coil current and piston velocity.
On-state Torque Optimization for Synthesized MR FluidIJERA Editor
Magneto-Rheological (MR) fluids are the suspension of magnetizable particles in a carrier fluids and their
rheological properties viscosity etc. can be changed by varying the magnetic field applied to it. Due to such
variable characteristics, these MR fluids find wide application in various automotive industries devices e.g. MR
brakes and MR clutches etc. In MR brakes, the MR fluids generate a resisting torque (between housing and
rotor) within milliseconds on the application of magnetic field. In the present work, the optimal values of MR
fluid constituents is obtain which give the high values of on-state torque. For this, 18 samples of MR fluids are
prepared and their compositions are selected using L-18 orthogonal array. Further, an experimental approach is
used to determine and validate the torque generated by the MR fluid samples. For this purpose, experimental
setup is designed and fabricated in-house. ANOVA is used to statistically analyze the significant factors which
affect the on-state torque which in-turn gives the optimal composition of MR fluid. For this optimal composition,
on-state torque of the MR fluid sample came out to be 0.887587 N-m.
PERFORMANCE OF HYBRID ELECTROMAGNETIC DAMPER FOR VEHICLE SUSPENSIONijiert bestjournal
Suspension systems, in the automotive application context, have been designed to maintain
contact between a vehicle’s tires and the road, and to isolate the frame of the vehicle from road
disturbances. Dampers, or so-called shock absorbers, as the undeniable heart of suspension
systems, reduce the effect of a sudden bump by smoothing out the shock. In most shock
absorbers, the energy is converted into heat via viscous fluid. In hydraulic cylinders, the
hydraulic fluid is heated up. In air cylinders, the hot air is emitted into the atmosphere. There are
several common approaches for shock absorption, including material hysteresis, dry friction,
fluid friction, compression of gas, and eddy currents.
The design and simulation of magneto-rheological damper for automobile suspen...IJRES Journal
As the application of magneto-rheological (MR) damper in automobile suspension semi-active
control, according to the character of the MR fluid and the relations between the damping force of MR damper
and the structure parameters, the new-type automobile suspension MR damper was designed. At present, the
design method of MR damper is still depended on the experience of the designer, which can't be calculated
accurately. In this paper, after a review of the features and models of MR materials and devices, geometrical
design and magnetic circuit design of MR damper were presented and discussed in detail, then the performance
of MR damper was analyzed by MATLAB. Simulation results showed that the design method of this automobile
suspension MR damper was feasible and the test performance was satisfactory, which could meet the
requirements of damping system for automobile suspension and achieve the required adjustable range of
anticipative damping force.
This paper presents the experimental and analytical modal analysis of a magneto-rheological
elastomer. The effective material and geometrical properties are measured, and the dynamic behaviour is
investigated through testing. Fabrication of isotropic and anisotropic magneto-rheological elastomers
with different percentages of iron particles are carried out. Also two numbers of silicon elastomer in
which one having steel net kept layer by layer in place of iron particles during pouring of liquid silicon
elastomer in mould, other is simple silicon elastomer without iron particle or steel net are fabricated.The
modal analysis of all samples are being analyzed using FFT analyser. And transmissibility and
amplitudes of all samples are compared with respect to load. A comparative study has been made
between different samples of MRE’s using results and comparisons obtained using experimental method.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Stability Analysis of Journal Bearing Using Electro Rheological Fluid by Fini...ijsrd.com
in rotating machinery, the damping of structure which supports the rotating shaft has significant effect in machine vibration. Therefore by controlling the lubricant properties, the dynamic behavior of the system can be controlled. The objective of this paper is to study the dynamic behavior of a rotor supported by a journal bearing and fed with Electro-rheological (ER) fluid. ER fluids can be used to create ‘smart’ journal bearings & vibration controllers can be constructed to control the Stability of the ER fluid lubricated bearings. The ER fluid behaves like a Bingham fluid with a higher viscosity when electric field is applied, and restores its property when the field is removed. A reversible change in viscosity occurs in milliseconds with the electric field applied.
Comparison of analytical methods of analysing linear induction motors Chandan Kumar
Linear induction motor has found many applications, from slow moving sliding doors to high-speed ground transportation around the world. Although various methods have been developed for the analysis of linear induction motor, only few verifiable comparisons between these methods have been done in literature. These methods solve the Maxwell’s equations in and around the geometry of the machine and take care of the physical dimensions of the machine. These methods which are proved accurate are based on Fourier transform, Fourier series and Space harmonic techniques. Out of different methods of analysis, only few methods have been reported into the literatures which are capable of taking care of topological changes in Linear induction motor. Here in this work different computer programs have been developed which are based on the above techniques. These computer programs have been validated using the published results. These have been predicting the single sided and double sided Linear induction motors. A comparison of these methods has been reported for finding their suitability for the use of these methods for predicting the characteristics of LIM under different operating conditions.
Presented at National Conference on Mathemetical Modelling and Computer Simulation,2011.
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Maruthi Prithivirajan, Head of ASEAN & IN Solution Architecture, Neo4j
Get an inside look at the latest Neo4j innovations that enable relationship-driven intelligence at scale. Learn more about the newest cloud integrations and product enhancements that make Neo4j an essential choice for developers building apps with interconnected data and generative AI.
Pushing the limits of ePRTC: 100ns holdover for 100 daysAdtran
At WSTS 2024, Alon Stern explored the topic of parametric holdover and explained how recent research findings can be implemented in real-world PNT networks to achieve 100 nanoseconds of accuracy for up to 100 days.
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
Building RAG with self-deployed Milvus vector database and Snowpark Container...Zilliz
This talk will give hands-on advice on building RAG applications with an open-source Milvus database deployed as a docker container. We will also introduce the integration of Milvus with Snowpark Container Services.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
zkStudyClub - Reef: Fast Succinct Non-Interactive Zero-Knowledge Regex ProofsAlex Pruden
This paper presents Reef, a system for generating publicly verifiable succinct non-interactive zero-knowledge proofs that a committed document matches or does not match a regular expression. We describe applications such as proving the strength of passwords, the provenance of email despite redactions, the validity of oblivious DNS queries, and the existence of mutations in DNA. Reef supports the Perl Compatible Regular Expression syntax, including wildcards, alternation, ranges, capture groups, Kleene star, negations, and lookarounds. Reef introduces a new type of automata, Skipping Alternating Finite Automata (SAFA), that skips irrelevant parts of a document when producing proofs without undermining soundness, and instantiates SAFA with a lookup argument. Our experimental evaluation confirms that Reef can generate proofs for documents with 32M characters; the proofs are small and cheap to verify (under a second).
Paper: https://eprint.iacr.org/2023/1886
Removing Uninteresting Bytes in Software FuzzingAftab Hussain
Imagine a world where software fuzzing, the process of mutating bytes in test seeds to uncover hidden and erroneous program behaviors, becomes faster and more effective. A lot depends on the initial seeds, which can significantly dictate the trajectory of a fuzzing campaign, particularly in terms of how long it takes to uncover interesting behaviour in your code. We introduce DIAR, a technique designed to speedup fuzzing campaigns by pinpointing and eliminating those uninteresting bytes in the seeds. Picture this: instead of wasting valuable resources on meaningless mutations in large, bloated seeds, DIAR removes the unnecessary bytes, streamlining the entire process.
In this work, we equipped AFL, a popular fuzzer, with DIAR and examined two critical Linux libraries -- Libxml's xmllint, a tool for parsing xml documents, and Binutil's readelf, an essential debugging and security analysis command-line tool used to display detailed information about ELF (Executable and Linkable Format). Our preliminary results show that AFL+DIAR does not only discover new paths more quickly but also achieves higher coverage overall. This work thus showcases how starting with lean and optimized seeds can lead to faster, more comprehensive fuzzing campaigns -- and DIAR helps you find such seeds.
- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
UiPath Test Automation using UiPath Test Suite series, part 5DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 5. In this session, we will cover CI/CD with devops.
Topics covered:
CI/CD with in UiPath
End-to-end overview of CI/CD pipeline with Azure devops
Speaker:
Lyndsey Byblow, Test Suite Sales Engineer @ UiPath, Inc.
GraphSummit Singapore | The Future of Agility: Supercharging Digital Transfor...Neo4j
Leonard Jayamohan, Partner & Generative AI Lead, Deloitte
This keynote will reveal how Deloitte leverages Neo4j’s graph power for groundbreaking digital twin solutions, achieving a staggering 100x performance boost. Discover the essential role knowledge graphs play in successful generative AI implementations. Plus, get an exclusive look at an innovative Neo4j + Generative AI solution Deloitte is developing in-house.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
In his public lecture, Christian Timmerer provides insights into the fascinating history of video streaming, starting from its humble beginnings before YouTube to the groundbreaking technologies that now dominate platforms like Netflix and ORF ON. Timmerer also presents provocative contributions of his own that have significantly influenced the industry. He concludes by looking at future challenges and invites the audience to join in a discussion.
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
Full-RAG: A modern architecture for hyper-personalizationZilliz
Mike Del Balso, CEO & Co-Founder at Tecton, presents "Full RAG," a novel approach to AI recommendation systems, aiming to push beyond the limitations of traditional models through a deep integration of contextual insights and real-time data, leveraging the Retrieval-Augmented Generation architecture. This talk will outline Full RAG's potential to significantly enhance personalization, address engineering challenges such as data management and model training, and introduce data enrichment with reranking as a key solution. Attendees will gain crucial insights into the importance of hyperpersonalization in AI, the capabilities of Full RAG for advanced personalization, and strategies for managing complex data integrations for deploying cutting-edge AI solutions.
GraphSummit Singapore | The Art of the Possible with Graph - Q2 2024Neo4j
Neha Bajwa, Vice President of Product Marketing, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
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1. Nakate A.V., Prashant Pawar / International Journal of Engineering Research and Applications
(IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.1418-1422
1418 | P a g e
“Design and Development of Semi-Active Beams Based on
Embedded Magneto-Rheological Fluid Dampers”
Nakate A.V.*
, Prashant Pawar**
* (Department of Mechanical, S.V.E.R.I. COE Pandharpur, India)
** (Department of Civil, S.V.E.R.I. COE Pandharpur, India)
ABSTRACT:
There are two types of vibration
controlling strategies which are passive strategies
and active strategies. But one modified strategy
was developed known as semi-active vibration
control strategy. MR phenomenon was studied.
Need of these semi-active devices was explained.
Economical, durable and robust MR damper was
developed. MR fluid filled beam and MR fluid
was prepared. Two types of composite beams are
developed and experimented by varying the
dimensions of beams, iron particle percentage in
magnetorheological fluid, magnetic field at
different excitation current. For this composite
beam with increase in magnetic field, damping
was increased and the frequency shift was
observed. Also change in amplitude of vibration
was observed.
Keywords: Amplitude, Damping, Magnetic field,
MR phenomenon
I. INTRODUCTION
Modern industry has a great need of
advanced damping system which could dissipate
energy from the random vibration to improve
structural safety and system performance. Most of
the existing systems are equipped with the passive
damping system because of its simplicity in
reflecting or absorbing part of input energy without
any power requirement. Another important vibration
reduction approach is the semi-active system which
takes advantages of both the passive and active
damping systems. Magneto Rheological (MR)
dampers and Electro Rheological (ER) dampers are
the two main examples of this approach. However
due to various advantages of MR dampers over ER
dampers, MR dampers are getting more attention.
MR dampers are the same as classical dampers
except the fluid used in the damper. This fluid is
called as MR fluid. MR damper fluids are relatively
new semi-active devices that utilize MR fluids to
provide controllable damping forces. MR dampers
are one of the most promising control devices for
engineering applications because they have many
advantages such as small power requirement,
reliability and low price to manufacture. MR fluids
are always better than ER fluids. MR fluids had
more yield strength than ER fluids. Operating
temperature range is also high for MR fluids as
compared to ER fluids. Power supply needed for
MR fluids is very less than ER fluids. As per above
comparison between MR fluids & ER fluids we can
say that MR fluids are always better than ER fluids.
Semi-active devices are capable of
charging the properties as per requirement with
minimum power requirement and less complicated
design as compared to the active devices. This helps
in reducing the manufacturing and operating cost as
compared with active devices. Most of the semi-
active devices are based on the fluids with
rheological properties such as Electro Rheological
(ER) and Magneto Rheological (MR) fluids. Due to
various advantages, semi-active vibration reduction
devices are becoming popular in various
applications in automobile, mechanical, civil and
aerospace engineering. These fluids can provide
significant and rapid changes in the damping
properties with application of an magnetic field.
With the extensive research on MR fluids
and MR dampers, researchers have shifted focus on
development of MR fluid based applications.
However lot of work is needed in the development
of semi-active beams which will have enormous
applications. Main focus of MR based beam was
based on MR elastomer based beams which helped
in achieving variable stiffness along with variable
damping. Recently, few researchers have started
developing sandwich beams based on the MR fluids.
To overcome these shortcomings, this work
focuses on developing beams based on the
Principles equivalent to MR fluid dampers. In this
study, various configurations of MR dampers will
be embedded in the beams and their damping and
stiffness performance will be studied.
In the present study, two types of cantilever
sandwich MR beams are fabricated and these
vibration responses under varying magnetic fields
are studied. In the first type free and forced
vibration response of aluminium sandwich beam is
presented. The comparison of partially treated
aluminium beam against the fully filled beam is
evaluated. In the second type composite cylindrical
MR sandwich beam subjected to forced vibrations is
studied. It consists of an external stainless steel pipe
with end mass, an inner interchangeable rod (of
different diameter and material) and sandwich layer
of MR fluid. Results showed that under increased
magnetic field vibration controllability of cantilever
beams is improved in turns of variations of vibration
2. Nakate A.V., Prashant Pawar / International Journal of Engineering Research and Applications
(IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.1418-1422
1419 | P a g e
amplitudes and shift of peaks in resonant natural
frequencies.
II. LITRATURE REVIEW
Carlson et al. [1] discovered that
Controllable magnetorheological (MR) fluid devices
had reached the stage where they were in
commercial production. Such devices had found
application in a variety of real world situations
ranging from active vibration control to aerobic
exercise equipment. Examples of several,
commercial MR fluid devices were described and
the comparative ability of MR and ER fluids to meet
the needs of particles devices was discussed.
According to Karakocet et al. [2], design
considerations for building an automotive magneto-
rheological(MR) brake were discussed. The
proposed brake consists of multiple rotating disks
immersed in a MR fluid and an enclosed
electromagnet. When current was applied to the
electromagnet, the MR fluid solidifies as its yield
stress varies as a function of the magnetic field
applied. This controllable yield stress produced
shear friction on the rotating disks, generating the
braking torque. In this work, practical design criteria
such as material selection, sealing, working surface
area, viscous torque generation, applied current
density, and MR fluid selection were considered to
select a basic automotive MR brake configuration.
Then, a finite element analysis was performed to
analyze the resulting magnetic circuit and heat
distribution within the MR brake configuration. This
was followed by a multidisciplinary design
optimization (MDO) procedure to obtain optimal
design parameters that can generate the maximum
braking torque in the brake. A prototype MR brake
was then built and tested and the experimental
results showed a good correlation with the finite
element simulation predictions. However, the
braking torque generated was still far less than that
of a conventional hydraulic brake, which indicated
that a radical change in the basic brake
configuration was required to build a feasible
automotive MR brake.
Pan et al. [3] developed analytical model of
a magnetorheological damper and its application to
the vibration control. Magnetorheological (MR)
fluid and its damper had received a great deal of
attention in the recent years. It was very useful for
this MR controllable damper in the vibration control
system, especially as a semi-active control device.
To develop the control algorithms that take
maximum advantage of the unique features of the
MR damper, a model was needed to be developed
that can adequately characterize the damper intrinsic
behavior. Following a review of three mechanical
models for MR damper the effect of these models on
the vibration control was analyzed in a one-degree-
of-freedom system. Numerical simulations were
performed when the MR damper was used as the
passive type damper on-off type damper and quasi-
skyhook type damper. The results show that the
models were less affecting the vibration control
performance, and the MR damper appears the best
control performance in the quasi-skyhook type.
Vibration analysis of a multi-layer beam
containing magnetorheological fluid by Rajmohan et
al. [4] exhibited rapid variations in their rheological
properties when subjected to varying magnetic field
and thus offered superior potential for applications
in smart structures requiring high bandwidth. MR
sandwich structures could apply distributed control
force to yield variations in stiffness and damping
properties of the structure in response to the
intensity of the applied magnetic field and could
thus provided vibration suppression over a broad
range of external excitation frequencies. This study
investigated the properties of a multi-layered beam
with MR fluid as a sandwich layer between the two
layers of the continuous elastic structure. The
governing equations of a multi-layer MR beam were
formulated in the finite element form and using the
Ritz method. A free oscillation experiment was
performed to estimate the relationship between the
magnetic field and the complex shear modulus of
the MR materials in the pre-yield regime. The
validity of the finite element and Ritz formulations
developed was examined by comparing the results
from the two models with those from the
experimental investigation. Various parametric
studies had been performed in terms of variations of
the natural frequencies and loss factor as functions
of the applied magnetic field and thickness of the
MR fluid layer for various boundary conditions. The
forced vibration responses of the MR sandwich
beam were also evaluated under harmonic force
excitation. The results illustrated that the natural
frequencies could be increased by increasing the
magnetic field while the magnitudes of the peak
deflections could be considerably decreased, which
demonstrated the vibration suppression capability of
the MR sandwich beam.
Vibration analysis of a partially treated
multi-layer beam with magnetorheological fluid by
Rajmohan et al. [5] suggested that semi-active
vibration control based on magnetorheological (MR)
materials offered excellent potential for high
bandwidth control through rapid variations in the
rheological properties of the fluid under varying
magnetic field. Such fluids may be conveniently
applied to partial or more critical components of a
large structure to realize more efficient and compact
vibration control mechanism with variable damping.
This study investigated the properties and vibration
responses of a partially treated multi-layer MR fluid
beam. The governing equations of a partially treated
multi-layered MR beam were formulated using
3. Nakate A.V., Prashant Pawar / International Journal of Engineering Research and Applications
(IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.1418-1422
1420 | P a g e
finite element method and Ritz formulation. The
results showed that the natural frequencies and
transverse displacement response of the partially
treated MR beams were strongly influenced not only
by the intensity of the applied magnetic field, but
also by the location and the length of the fluid
pocket. The application of partial treatment could
also alter the deflection pattern of the beam,
particularly the location of the peak deflection.
III. ANALYSIS
MR sandwich cantilever beams of various
configurations were tested on the experimental
setup. It consists of an exciter, oscillator, FFT
analyzer, fixture for holding the beams and software
for getting results. The experiments are organized in
three different sections.
3.1 Aluminium plate beam
Middle filled aluminium plate cantilever
beam containing magnetorheological fluid with 50%
iron particles was experimented. Without any
external magnetic field this beam was studied and
also studied the effect of external magnetic field on
the beam.
Without any magnetic field the response
showed higher amplitudes of vibration 2.17mm and
it was observed that resonance frequency of the
beam was 30Hz. With further increase in magnetic
field 500 gauss there was slight decrease in
amplitude of vibration up to 1.55mm and resonance
frequency remained same to 28Hz.
Figure 1 Aluminium plate beam middle filled
Table 1 Displacement Response for Different
Excitation Current without any Magnetic Field
Frequency
in Hz
Current
in Amp
Displacement
in mm
24
0.6
0.749
26 1.82
28 2.08
30 2.17
32 1.04
34 0.769
36 0.478
Table 2 Displacement Response for Different
Excitation Current with Magnetic Field 550 gauss
Frequency
in Hz
Current
in Amp
Displacement
in mm
24
0.6
0.560
26 1.02
28 1.55
30 1.08
32 0.715
34 0.474
36 0.323
Figure 2 Displacement Response Curve for
Aluminium Plate Beam Middle Filled and 50% Iron
Particles at Different Magnetic fields
3.2 Cantilever Beam with 0.5mm gap (inner
diameter of steel cylinder was 17mm and outer
diameter wooden of rod was 16mm) and
Magnetorheological fluid with 30% iron particle
MR sandwich beam was assembled to
maintain 0.5mm gap and fitted on the fixture for
testing. Tests were conducted at different
frequencies and different currents and the
displacements were obtained for various magnetic
fields.
Figure 3 Experimental setup for MR sandwich beam
with applied magnetic field
Table 3 Displacement Response for Different
Excitation Current without any Magnetic Field
0
1
2
3
24 26 28 30 32 34 36 38 40
Without Any
Magnetic
Field
With
Magnetic
Field 500
gauss
Frequency
in Hz
Current
in Amp
Displacement
in mm
24
0.9
0.564
26 0.761
28 1.04
30 2.13
32 5.24
34 1.58
36 0.896
4. Nakate A.V., Prashant Pawar / International Journal of Engineering Research and Applications
(IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.1418-1422
1421 | P a g e
Table 4 Displacement Response for Different
Excitation Current with Magnetic Field 600 gauss
Frequency
in Hz
Current
in Amp
Displacement
in mm
24
0.9
0.624
26 0.818
28 1.08
30 2.52
32 3.65
34 1.29
36 0.938
Without any magnetic field the response
showed higher amplitudes of vibration 5.24mm and
it was observed that response frequency of the beam
was 32Hz. With further increase in magnetic field
600 gauss there was slight decrease in amplitude of
vibration up to 3.65mm and resonance frequency
remained same to 32Hz.
Figure 4 Displacement Response Curve for Beam
with Wooden Rod having Field Gap 0.5mm and
30% Iron Particles at Different Magnetic fields
3.3 Cantilever Beam with Metal Rod, Gap 0.5mm
(inner diameter of steel cylinder was 17mm and
outer diameter steel of rod was 16mm) and
Magnetorheological Fluid at Various Magnetic
Fields
MR sandwich beam was assembled to
maintain 0.5mm gap and fitted on the fixture for
testing. Tests were conducted at different
frequencies and different currents and the
displacements were obtained for various magnetic
fields.
Table 5 Displacement Response for Different
Excitation Current without any Magnetic Field
Frequency
in Hz
Current
in Amp
Displacement
in mm
16
0.9
0.400
18 0.487
20 0.675
22 1.08
24 3.23
26 1.14
28 0.480
Without any magnetic field the response
showed higher amplitudes of vibration 3.23mm and
it was observed that resonance frequency of the
beam was 24Hz. With further increase in magnetic
field 550 gauss there was considerable decrease in
amplitude of vibration up to 2.46mm and resonance
frequency remained same to 24Hz.
Table 6 Displacement Response for Different
Excitation Current with Magnetic Field 550 gauss
Frequency
in Hz
Current
in Amp
Displacement
in mm
16
0.9
0.424
18 0.559
20 0.841
22 1.46
24 2.46
26 1.08
28 0.576
Figure 5 Displacement Response Curve for Beam
with Metal Rod having Field Gap 0.5mm and 30%
Iron Particles at Different Magnetic fields
IV. CONCLUSION
According to the readings and related
plotted graphs for aluminium plate beam middle
filled by varying intensities of applied magnetic
field both change in frequency and damping was
observed. Also with increase in magnetic fields the
amplitude of vibrations reduced. It was observed
that for steel cylinder and wooden rod composite
beam with increase in magnetic field, damping was
increased. For steel cylinder and steel rod composite
beam also damping was increased with increasing
magnetic field. The structural vibrations can be
reduced by using MR fluid filled beams with very
simple and economical arrangement. Also variable
damping can be obtained by varying the
compositions and the applied magnetic field.
REFERENCES
[1] Carlson J.D., Catenaries D.M., and St. Clair
K.A. (1995) “Commercial
Magnetorheological Fluid Devices,”
Proceedings of 5th International Conference
0
2
4
6
24 26 28 30 32 34 36 38 40
Without Any
Magnetic Field
With Magnetic
Field 600 gauss
0
0.5
1
1.5
2
2.5
3
3.5
0 20 40
Without Any
Magnetic
Field
With
Magnetic
Field 550
gauss
5. Nakate A.V., Prashant Pawar / International Journal of Engineering Research and Applications
(IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 3, Issue 3, May-Jun 2013, pp.1418-1422
1422 | P a g e
on ER Fluids, MR Fluids and Associated
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[2] Karakoc K., Park E.J. and Suleman A. (2008)
“Design Considerations for an Automotive
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[3] Pan G., Matsuhisa H. and Houda Y. (2000),
“Analytical Model of a Magnetorheological
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Annual
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1850-1855.
[4] Rajamohan V., Sedaghati R. and Rakheja S.
(2010) “Vibration Analysis of Multilayer
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[5] Rajamohan V., Sedaghati R. and Rakheja S.
(2010) “Vibration Analysis of a Partially
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