Mechanical Engineering

# Blogs

## Types of Kinematic pairs

When two links (or elements) in a machine are in contact with each other, they form a pair. When the relative motion between these two links is completely or partially constrained, then the links are said to form a kinematic pair.In simple words, a kinematic pair or simply a pair is a joint of two links having relative motion between them.    Kinematic pairs can be classified on the basis of:   1) Nature of contact between the pairing elements  (a) Lower pair – surface

## Types of Hydraulic Turbines

Turbines are machines which convert fluid energy to mechanical energy. When the fluid used is water, they are called hydraulic turbines.  Hydraulic turbines may be classified on the basis of four characteristics :       On the basis of the type of energy at the turbine inlet Impulse turbine total head of the incoming fluid is converted in to a large velocity head at the exit of the supply nozzle ( entire available energy of the w

Mechanics Corner     A Journal of Applied Mechanics & Mathematics by DrD, #33     © Machinery Dynamics Research, 2016 Advanced Polynomial Curve Fitting     The use of polynomials to fit engineering data is a common engineering practice. In school, we learn that "A data set consisting of n data points ((x_{i},y_{i}), i=1,2,3,…n) can be exactly fitted with a polynomial of degree n-1. Thus three data points can be fitted exactly with a quadratic expression, four data points ca

## Braced Cantilever

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, # 32     © Machinery Dynamics Research, LLC, 2015 Braced Cantilever Introduction     Anyone who has actually gotten into machine design is familiar with this difficulty. Consider the situation where a project is well advanced, many plans have been made, and it is all based on the assumption of the adequacy of one particular part. When you finally get to the detailed analysis of that part, the calculat

## What is the name of this mechanism.

good morning Someone could tell me what the name of this mechanism or how can I find a way to design it. It is a shaft that moves in a straight line vertically and along the way makes a 180 ° worst shaft never leaves his line of action . these links you can see the operation of the mechanism     Thank you Imagenes del giro.docx

## ODE Solution --- Fail!!

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, # 31       Machinery Dynamics Research, 2016 ODE Solution --- Fail!!      Introduction     Digital computation has become a major tool for engineers, and it is a great benefit. It can also lead to many pitfalls for the unwary. This note is about the latter, a potential pitfall that many engineers risk on a daily basis, most of them with little awareness of the danger.     Early in the developme

## Change in the website addres

kindly note  Previous url was - http://mechanical-engg.com/forum/ Now current url   http://mechanical-engg.com If you open the old url : it will automatically redirected to new url   Regards Saurabh

## Where is this?

Does anyone recognize where this video is shot? Is it a group of students at a school (what school?), or is it an industrial site (what company)? I am anxious for someone to locate this for me, please. DrD   Saurabh Jain, our host, has identified this location for me, and that is much appreciated. When I watched the video, I was aghast at all those nearly bare feet in a machine shop! I can appreciate that in Indian culture, the simple sandals are socially quite acceptable, bu

## Did I Go to School to Make Copies?

I did not write the linked article. I should have since you will not learn this in school. When we finish 4 or more years of an ME education we are all wound up. We have been working at a pace which would kill us if tried it indefinitely. What shocked me when I entered industry was the trivia that engineers must be involved with. Perhaps like a soldier, you train to fight, but you don't do it 8-12/hr per day for 30 years. I don't know if the following article is accurate for small companies but

Many of you have asked me various questions, so now it is my turn. Let me lay a bit of background first, and then the questions.   I have had some conversations recently with JAG (one of the other writers here at ME Forums) regarding the choice of software for 3D modeling and analysis. JAG has made some excellent suggestions, specifically a cloud based program called Onshape. Unfortunately, for reasons that are unclear, my computer cannot run Onshape; I have worked with their help peop

## Rule and equation

Hi guys, can someone here help me to understand this better, explain in a teoretical way to understand Chvorinov's Rule and Bernoulli`s equation? Not just in a simple way, but deeper, can someone here do that, or knows how?   Thanks in advance!!!!

## Nobody Told Me This Was a Math Class

Since a lot of young people visit this forum I thought it could be of value repeat what I learned 40 years ago. I did learn the following from one of my professors not in the classroom but during a meeting with her as my adviser. I did not fully appreciate what she suggested though I did follow her advice and it was the correct thing for me. I was in a city community college (CC). The four year city colleges were somewhat prestigious. The CC prepared students to transfer within the cit

## Economical Robotic Vacuum cleaner

Robotics brings together several very different engineering areas and skills. There are various types of robot such as humanoid robot, mobile robots, remotely operated vehicles, modern autonomous robots etc. This survey paper advocates the operation of a robotic car (remotely operated vehicle) that is controlled by a mobile phone (communicate on a large scale over a large distance even from different cities). The person makes a call to the mobile phone placed in the car. In the case of a call, i

## The Dumbest Guy in the Room.

Over the years I have witnessed a particular mistake repeated. It is usually with an old product that has a problem, or the old product requiring a change or a feature added. The mistake manifests itself with everyone believing they carry the true operation and understanding in their heads. Aside from Scotty aboard the USS Enterprise, most should assume there is something they may not know. When a new product is being developed the team usually follows some development process with defined

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all mechanical engineers blog

## INTERVIEW QUESTIONS AND ANSWERS – MECHANICAL ENGINEERING DESIGN, SAFETY AND MAINTENANCE

Mechanical Engineering Interview Questions and answers for freshers on design, safety and maintenance. 1) What is an accident ? An accident is a unexpected and unforeseen event which may or may not injury to a person or a machine tool. 2) What are the standard sizes of drawing board as per Indian Standards? As per Indian Standards :1250×900,900×650,650×500,500×350,350×250 sizes are available. 3) What are the functions of a scale ? (a) To measure distance accurately.

## Becoming An Expert -- Part 3

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD     © Machinery Dynamics Research, 2016 Becoming An Expert -- Part 3      Introduction     In the previous article on Becoming An Expert--Part 2, I mentioned that there were two big issues for the engineering analysis section at my Houston position, the first being the matter of seismic survivability and the second being torsional vibration. The first item was dealt with in Part 2, and in this art

## A Comment Remembered

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD     © Machinery Dynamics Research, 2016 A Comment Remembered          Recently, in connection with one of the posts on Becoming An Expert, one of the ME Forum readers made a comment to me, something about seeing everything in terms of differential equations. That comment brought to mind a comment made to me many years ago that I want to pass along to you today.     Most of my college education was at th

## Becoming An Expert -- Part 2

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD     © Machinery Dynamics Research, 2016 Becoming An Expert -- Part 2      Introduction     In the previous article on How To Become An Expert, I covered a lot of points in generalities with some short anecdotes from my own experience. In this article and the next, I will describe in considerably more detail a critical period in my own formation, an time of considerable professional embarrassment w

## How To Become An Expert

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD     © Machinery Dynamics Research, 2016 How To Become An Expert      Introduction     This is going to be another of those personal experience/opinion pieces, so if these bore you, be warned! This may be the time to click on something else.     A reader recently wrote to me asking how to become an expert. I have to tell you, I don't spend much time thinking about being an expert, but I suppose o

## Dump Trucks Vs Donkeys.

Nearly Forty years ago, a fellow engineer told me a story that must now be 70 years old. This engineer was born and educated in Egypt. His first job was a large civil engineering project with massive amounts of earth moving. Having a formal education but no local real world experience, he started to estimate how many steam shovels and trucks were required for the job. A Sr. engineer asked, what he planned do with all the equipment once the project was done, and what about the 99 local laborers l

## #28 -- Analytical Design -- Part III

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, # 28     © Machinery Dynamics Research, 2016 Analytical Design -- Part III      Introduction     In Parts I and II of this series, we began looking into the design analysis for an emergency steam cut-off valve for a nuclear power plant. Part I simply posed the problem, and Part II got into the detailed kinematic analysis of the four bar linkage that is to control the motion of the plug as it shut

## John Deere & Culture Shock

More than once, I have remarked in this blog about the lack of participation. I have been mystified by the lack of questions and comments on my articles. Even those that get several thousand views, often have no comments at all. I just don't understand it! Yesterday, I had a visit. My visitor is a former student of mine, a fellow that I taught back in the early 1980s. His name is Bob, and Bob was an Ag Engineering student, if I recall correctly. He took my theory of machines class as an ele

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