This document summarizes two types of damping: Coulomb damping and viscous damping. Coulomb damping involves friction between two surfaces, with a friction force proportional to the normal force. Viscous damping dissipates energy through forces proportional to velocity as objects move through fluids. Examples of each type are given, such as friction joints in airplanes for Coulomb damping and fluid films between surfaces for viscous damping. Key differences between the two types are outlined in a table, such as viscous damping force depending on velocity while Coulomb damping force depends on friction coefficients.
single degree of freedom systems forced vibrations KESHAV
SDOF, Forced vibration
includes following content
Forced vibrations of longitudinal and torsional systems,
Frequency Response to harmonic excitation,
excitation due to rotating and reciprocating unbalance,
base excitation, magnification factor,
Force and Motion transmissibility,
Quality Factor.
Half power bandwidth method,
Critical speed of shaft having single rotor of undamped systems.
BEST PPT FOR DOWNLOADING & SUBMISSION
INFORMATION IN POINTS
When the inertia forces are considered in the analysis of the mechanism, the analysis is known as dynamic force analysis.
Now applying D’Alembert principle one may reduce a dynamic system into an equivalent static system and use the techniques used in static force analysis to study the system.
Garcia and Bayo (1994), Wang and Wang (1998), Shi and Mc Phee (2000) were interested in the analytical and
experimental study of the dynamic response of these mechanisms
What is a single degree of freedom (SDOF) system ?
Hoe to write and solve the equations of motion?
How does damping affect the response?
#WikiCourses
https://wikicourses.wikispaces.com/Lect01+Single+Degree+of+Freedom+Systems
https://eau-esa.wikispaces.com/Topic+Single+Degree+of+Freedom+%28SDOF%29+Systems
single degree of freedom systems forced vibrations KESHAV
SDOF, Forced vibration
includes following content
Forced vibrations of longitudinal and torsional systems,
Frequency Response to harmonic excitation,
excitation due to rotating and reciprocating unbalance,
base excitation, magnification factor,
Force and Motion transmissibility,
Quality Factor.
Half power bandwidth method,
Critical speed of shaft having single rotor of undamped systems.
BEST PPT FOR DOWNLOADING & SUBMISSION
INFORMATION IN POINTS
When the inertia forces are considered in the analysis of the mechanism, the analysis is known as dynamic force analysis.
Now applying D’Alembert principle one may reduce a dynamic system into an equivalent static system and use the techniques used in static force analysis to study the system.
Garcia and Bayo (1994), Wang and Wang (1998), Shi and Mc Phee (2000) were interested in the analytical and
experimental study of the dynamic response of these mechanisms
What is a single degree of freedom (SDOF) system ?
Hoe to write and solve the equations of motion?
How does damping affect the response?
#WikiCourses
https://wikicourses.wikispaces.com/Lect01+Single+Degree+of+Freedom+Systems
https://eau-esa.wikispaces.com/Topic+Single+Degree+of+Freedom+%28SDOF%29+Systems
This presentation gives the information about 'vibration measuring instruments' covering syllabus of Unit-5 of Theory of vibrations or mechanical vibrations for BE course under VTU, Belgaum. This presentation is prepared by Hareesha N G, Asst. Prof, Dept of Aerospace, DSCE, B'Lore-78.
Some basic defintions of the topics used in Strength of Materials subject. Pictorial presentation is more than details. Many examples are provided as well.
Aircraft refrigeration system (air cooling system)Ripuranjan Singh
Aircraft air refrigeration systems are required due to heat transfer from many external and internal heat sources (like solar radiation and avionics) which increase the cabin air temperature. With the technological developments in high-speed passenger and jet aircraft's, the air refrigeration systems are proving to be most efficient, compact and simple. Various types of aircraft air refrigeration systems used these days are.
Simple air cooling system
Simple air evaporative cooling system
Boot strap air cooling system
Boot strap air evaporative cooling system
Reduced ambient air cooling system
Regenerative air cooling system
COMPRESSOR EFFICIENCY AND TURBINE EFFICIENCY.
Comparison of Various Air Cooling Systems used for Aircraft ON basis of dart
This presentation gives the information about 'vibration measuring instruments' covering syllabus of Unit-5 of Theory of vibrations or mechanical vibrations for BE course under VTU, Belgaum. This presentation is prepared by Hareesha N G, Asst. Prof, Dept of Aerospace, DSCE, B'Lore-78.
Some basic defintions of the topics used in Strength of Materials subject. Pictorial presentation is more than details. Many examples are provided as well.
Aircraft refrigeration system (air cooling system)Ripuranjan Singh
Aircraft air refrigeration systems are required due to heat transfer from many external and internal heat sources (like solar radiation and avionics) which increase the cabin air temperature. With the technological developments in high-speed passenger and jet aircraft's, the air refrigeration systems are proving to be most efficient, compact and simple. Various types of aircraft air refrigeration systems used these days are.
Simple air cooling system
Simple air evaporative cooling system
Boot strap air cooling system
Boot strap air evaporative cooling system
Reduced ambient air cooling system
Regenerative air cooling system
COMPRESSOR EFFICIENCY AND TURBINE EFFICIENCY.
Comparison of Various Air Cooling Systems used for Aircraft ON basis of dart
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
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Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
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Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
2. DAMPING
It is the resistance to the motion of vibrating body
These are of 2 types
1 Coulomb damping
2 Viscous damping
3. • Coulomb damping is a type of constant mechanical damping in which energy is
absorbed via sliding friction. The friction generated when a body is allowed to
slide over the another body surface , The surface of the body offers some
resistance to the movement of the other body. This resistance force is called as
force of friction or dry force.
• In general, damping is the dissipation of energy from a vibrating system where
the kinetic energy is converted into heat by the friction.
COULOMB DAMPING
4. Modes of Coulomb damping
• Coulomb damping absorbs energy with friction, which converts that kinetic energy into
thermal energy or heat. The Coulomb friction law is associated with two aspects. Static
and kinetic frictions occur in a vibrating system undergoing Coulomb damping
• Static friction occurs when the two objects are stationary or undergoing no relative
motion. For static friction, the friction force F exerted between the surfaces having no
relative motion cannot exceed a value that is proportional to the product of the normal
force R and the coefficient of static friction μs:
Fs = µsR
Where
Fs = frictional force
µs = coefficient of static friction
R= normal force
5. Modes of Coulomb damping
• Kinetic friction occurs when the two objects are undergoing relative motion and
they are sliding against each other. The friction force F exerted between the
moving surfaces is equal to a value that is proportional to the product of the
normal force R and the coefficient of kinetic friction μk:
Fk = µkR
Where
Fk = frictional force
µk = coefficient of kinetic friction
R= normal force
In both of these cases, the frictional force (F) always opposes the direction of
motion of the object. The normal force (R) is perpendicular to the direction of
motion of the object and equal to the weight of the object sliding.
6. • Newton's Second Law states that the equation of motion of the block is
m {x’’} = -kx-F or m{x}=-kx’+F
depending on the direction of motion of the block. In this equation {x} is the
acceleration of the block and {x’} is the position of the block. A real-life example
of Coulomb damping occurs in large structures with non-welded joints such as
airplane wings.
7. VISCOUS DAMPING
• Viscous damping is the dissipation of energy that occurs when a particle in a
vibrating system is resisted by a force the magnitude of which is a constant,
independent of displacement and velocity, and the direction of which is opposite to
the direction of the velocity of the particle.
• Viscous damping is caused by such energy losses as occur in liquid lubrication
between moving parts
• These can be applied for liquids as well as solids
• Liquids observes the energy so energy dissipates
• Example : 2 plates with oil in between
8. Viscous Damping
Viscous damping force is a formulation of the damping phenomena,
in which the source of damping force is modeled as a function of
the volume, shape, and velocity of an object traversing through a real
fluid with viscosity.
Typical examples of viscous damping in mechanical systems include:
• Fluid films between surfaces
• Fluid flow around a piston in a cylinder
• Fluid flow through an orifice
• Fluid flow within a journal bearing
9. S.NO Viscous damping Coulomb damping
1 In case of viscous damping, the ratio of 2
successive amplitudes was constant and
envelope of maxims of displacement time
curve was exponential curve.
In case of coulomb damping, the difference
between any 2 successive amplitudes is constant
and envelope of maxims of displacement time
curve was straight line.
2 In viscous damping, the system once disturbed
from mean equilibrium position then finally it
comes to rest in equilibrium position only and
theoretically it takes ∞∞ time.
In coulomb damping, the body may finally come
to rest in equilibrium or in displaced position
depending upon the initial amplitude and amount
of friction present.
3 Damping force is proportional to the velocity. Coulomb's damping force is independent of
velocity but depends on the co efficient of friction.
4 In viscous under damping system mass
oscillates about the same mean position.
Mean position about which mass oscillates varies
with each half cycle.
5 Applied for both liquids and solids Applied only for solids
6 Liquid observes energy so energy dissipation
takes place
Energy dissipates because of friction between 2
solid surfaces