- The document discusses degrees of freedom (DOF) and Gruebler's criterion for calculating DOF. It then explains Grashof's four-bar mechanism and the conditions for it to have full rotation.
- Kinematic inversions are introduced as the process of obtaining different mechanisms from the same kinematic chain by fixing different links. The four possible inversions of a four-bar chain are described.
- Examples of inversions include the beam engine (crank and lever), the coupling rod of a locomotive (double crank), and Watt's indicator mechanism (double lever).
Unit 2- mechanisms, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Inversion of four bar chain explained detailed graphic, used for better understanding as well as for teaching purose
For video:
Locomotive chain
https://www.youtube.com/watch?v=oTcC_xXfdrA
Four bar chain:
https://www.youtube.com/watch?v=KBFFwgCCP0U
It is a type of steam engine where a pivoted overhead beam is used to apply the force from a vertical piston to a vertical connecting rod.
It is basically a 6 link mechanism that converts rotary motion of crank into linear straight line motion of vertical sliding link that in practice is used in pumps and other purposes.
Unit 2- mechanisms, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Inversion of four bar chain explained detailed graphic, used for better understanding as well as for teaching purose
For video:
Locomotive chain
https://www.youtube.com/watch?v=oTcC_xXfdrA
Four bar chain:
https://www.youtube.com/watch?v=KBFFwgCCP0U
It is a type of steam engine where a pivoted overhead beam is used to apply the force from a vertical piston to a vertical connecting rod.
It is basically a 6 link mechanism that converts rotary motion of crank into linear straight line motion of vertical sliding link that in practice is used in pumps and other purposes.
Mechanics of machines: Linkage MechanismsRohit Singla
Components of Mechanisms
• Link / element
• Kinematic pairs / joints
• Kinematic chain
• Mechanism (Output w.r.t Input)
• Machine (Desired Output)
Link / Element
A single resistant body / combination of resistant
bodies having relative motion with another resistant
body / combination of resistant bodies.
Rigid Body Flexible Body Liquid
The mechanism is an assembly of machine components (Kinematic Links) designed to obtain the desired motion from an available motion while transmitting appropriate forces and moments.
Four bar linkage is a simple planer mechanism which has four bar shaped members. Usually it has one fixed link and three moving links and four pin joints.
Kinematics: The study of motion (position, velocity, acceleration). A major goal of understanding kinematics is to develop the ability to design a system that will satisfy specified motion requirements. This will be the emphasis of this class.
• Kinetics: The effect of forces on moving bodies. Good kinematic design should produce good kinetics.
• Mechanism: A system design to transmit motion. (low forces)
• Machine: A system designed to transmit motion and energy. (forces involved
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.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
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.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
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.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
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Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
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.
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
5. Degrees of freedom
F = 3 (L-1) – 2j – h – Fr
where Fr is the number of redundant degrees of freedom. Now, as the
above mechanism has a cam pair, its degree of freedom must be
found from Gruebler's criterion.
Total number of links = 4
Number of pairs with 1 degree of freedom = 3
Number of pairs with 2 degrees of freedom = 1
F = 3 (L- I) – 2j – 1h – Fr
= 3 (4 - 1) - 2x3 - l x 1- 1 = 1
6. Gruebler’s Criterion
• This criterion is used to find out whether an
assembly of links with 1 d.o.f. lower pairs is a
constrained mechanism or not.
• 3L – 2j – 4 = 0
• L – no. of links j – no.of lower pairs with
one d.o.f
Even Terms
7. F < 0 Pre-loaded structure
Super structure
F = 0 Structure
F = 1 Constrained Mechanism
F > 1 Unconstrained Mechanism
8. Formation of four-bar mechanism
• No. of links – 4, No. of pairs – 4.
• All the pairs are revolute pairs.
Links are :1. Fixed link or Frame
2. Input Link
3. Coupler
4. Output link or Follower
Most of the mechanisms are reversible
12. Grashof’s four-bar mechanism
s+l=p+q
But having pair of equal links
i.e. 4,4, 3 and 3
s
(1) Parallelogram linkage
Double crank
(2) Deltoid linkage
s
l
l
s
l
l
s
s fixed – Double crank
l fixed – crank- rocker
13. GRASHOF’ S LAW
In a planar four bar revolute pair kinematic chain if the sum of the
lengths of the shortest and the longest links is less than or equal
to the sum of the lengths of the other two intermediate links at
least one link will have full rotation.
Mechanisms obtained from the kinematic chain satisfying these
conditions are known as Grashofian Mechanisms.
Mechanisms obtained from the kinematic chain which are not
obeying these conditions are known as Non-Grashofian
Mechanisms.
14. Kinematic Inversions
• Process of obtaining different mechanisms from
the same kinematic chain, by fixing different
links in turn, is known as kinematic inversion.
• Four inversions are possible from four-bar
kinematic chain.
16. Inversions of four bar Mechanisms are named based on
the motions of input link and output link.
Crank - Link with 360 degree rotation
Rocker/Lever – Link with less than 360 degree
rotation
17. Four- bar Inversions
• Crank – Rocker Mechanisms (Two)
• Drag Link / Double Crank Mechanism
• Double – Rocker Mechanism
• Above are Grashofian Inversions
• All four non-Grashofian inversions are
Double – Rocker mechanisms
s l p q
19. Conditions for Inversions
• POSITION OF F0UR – BAR INVERSION
SHORTEST LINK
• Adjacent to the fixed link Crank – Rocker
• Fixed link itself Drag Link (Double Crank)
• Opposite to fixed link Double Rocker
20. Types of Kinematic Chains
• Four bar chain
• Single slider crank chain
• Double slider crank chain
21. Inversions of Four Bar Chain
• Beam engine (crank and lever mechanism)
• Coupling rod of a locomotive (Double crank mechanism)
• Watt’s indicator mechanism (Double lever mechanism)
The purpose of this mechanism
is to convert rotary motion into
reciprocating motion.
22. Inversions of Four Bar Chain
• Beam engine (crank and lever mechanism)
• Coupling rod of a locomotive (Double crank mechanism)
• Watt’s indicator mechanism (Double lever mechanism)
This mechanism is meant for transmitting rotary motion from
one wheel to the other wheel
23. Inversions of Four Bar Chain
• Beam engine (crank and lever mechanism)
• Coupling rod of a locomotive (Double crank mechanism)
• Watt’s indicator mechanism (Double lever mechanism)
Watt's straight line mechanism