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Mechanics Corner

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A Journal of Applied Mechanics and Mathematics by DrD

Entries in this blog

 

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

DrD

DrD

 

Where Will I Find A Job??

Where Will I Find A Job?? As I read over the questions that readers post here on ME Forum and elsewhere, I sense a common theme in many of them. There seems to be a wide, dare I say almost universal, concern about where those currently in college will find employment after graduation. To a degree this is entirely understandable; we all wonder what is in our future. Even so, the level of anxiety that I sense in many of your postings strikes me as extraordinarily high. Let us consider this a bit.

DrD

DrD

 

A Community Built On False Values -- An Opinion Piece

A Community Built on False Values This may well prove to be the least popular thing I ever post on this blog because what I have to say may offend many. I do not say it with the intent to offend, but because I am compelled to give a warning. One of the most interesting things that has developed from my blog, Mechanics Corner, here on the ME Forum has been the opportunity to correspond directly with a modest number of readers. This has included both young men and young women scattered across In

DrD

DrD

 

#20 -- A Question of Stability (Revised)

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, #20     © Machinery Dynamics Research, 2015 A Question of Stability Introduction     The word stability in its several forms is widely used in nontechnical communication. A person whose life it highly consistent from day to day is said to have a stable life. When the political situation in a particular area appears to be unlikely to change, it is said to be stable. A person who is well balanced and un

DrD

DrD

 

#1 -- Introductions

Welcome to the first installment of Mechanics Corner, a feature that we hope will become a regular blog item on Mechanical Engineering Forum. The intent is that every week we will have a new article on some aspect of Applied Mechanics and Mathematics, things of broad interest to mechanical engineers. Some of these articles will be fairly elementary, while others will be considerably more advanced, but the idea is to have something for everyone. We will hope to amuse, entertain, and most importan

DrD

DrD

 

#3 -- Kinematics Part I / Position Analysis

Position Analysis Introduction Many years ago, when I first began to study mechanics, the "conventional wisdom," expressed by both teachers and fellow students, was this: "Statics is easy, Dynamics is hard, and Kinematics -- who bothers to actually study kinematics? Kinematic relations, when needed, simply drop from the sky like rain, but nobody seriously studies kinematics." I eventually found the truth to be a bit more subtle: Statics of structures is generally easy, while the s

DrD

DrD

 

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

DrD

DrD

 

Twenty One Rules for Tech Writing

Twenty One Rules for Tech Writing Introduction One of the things that has surprised me about the readers of ME Forum is the number of folk who want to publish technical papers. When I was an undergraduate (a very, very long time ago), publishing papers was the farthest thing from my mind. I knew that publishing was a concern for some of the faculty, but it was certainly no concern of mine! To my even greater amazement, most of those desiring to write want to write in English, even though this

DrD

DrD

 

#2 -- Box Tipping

Mechanics Corner A Journal of Applied Mechanics and Mathematics by DrD, No. 2 © Machinery Dynamics Research, LLC, 2015 It is a common practice for manufacturers to ship their products in packing crates that are strapped down on pallets for handling. There is often concern about the stability of this package as it is handled in transit to the purchaser. For this problem, we understand that the manufacturer wants to perform a simple test on each package shipped to assure that it wil

DrD

DrD

 

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

DrD

DrD

 

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

DrD

DrD

 

A Question for Readers

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

DrD

DrD

 

#26 -- Analytical Design -- Part I

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, # 26     © Machinery Dynamics Research, 2016 Analytical Design -- Part I      Introduction     On ME Forums, there have been a number of questions raised about design. Many students are writing in asking for ideas for a senior design project, others are asking for help with a design problem, etc. There has been some discussion about "Just what is design?" That was definitely a question in the min

DrD

DrD

 

Engineering Philosophy

  Engineering Philosophy   You have probably heard of Engineering Econ, Engineering Management, etc., but what about Engineering Philosophy?   Most of the time, in engineering discussions we talk about “hard information,” that is, facts, ideas, and methods for doing various engineering activities. But behind all that, guiding it, there needs to be a correct philosop

DrD

DrD

 

#5 -- Kinematics Part III / Accelerations

Mechanics Corner A Journal of Applied Mechanics and Mathematics by DrD, # 5 © Machinery Dynamics Research, LLC, 2015     Vector Loop Kinematics -- Part III Acceleration Analysis Introduction In the first article in this series, titled "Vector Loop Kinematics - Part I/Position Analysis" the idea of using closed vector loops for the position analysis of mechanisms and machines was introduced. A second article, "Vector Loop Kinematics - Part II/Velocity

DrD

DrD

 

#7 -- Kinematics Part IV / Degrees of Freedom & Constraints

Mechanics Corner A Journal of Applied Mechanics and Mathematics by DrD, # 7 © Machinery Dynamics Research, LLC, 2015 Degrees of Freedom &  Constraints Introduction   The term "Degrees of Freedom" (often abbreviated as DOF) has been carefully avoided for the most part in these presentations up to this point, although it has crept in unavoidably a time or two. In this article, we attempted to face the matter squarely and deal with it fully. It is an importan

DrD

DrD

 

#21 -- Rigid Body Rotordynamic Instability, Part I

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, #21     © Machinery Dynamics Research, 2015 Rigid Body Rotordynamic Instability, Part I      Introduction     The rotating elements of machinery are usually balanced to avoid vibration which results in noise and fatigue damage. That said, perfect balance is not possible, and there are practical and economic limits to the effort that can be expended to balance machine components. Consequently,

DrD

DrD

 

How Do You Compute?? -- A Poll

The use of desktop, laptop, tablet, and other computers has become routine these days for engineering work. Along with this, there has been an ever-increasing number of software options for engineering calculations. It would be interesting to know just what software the readership here uses in their daily work and/or study.

DrD

DrD

 

#4 -- Kinematics Part II / Velocity Analysis

Mechanics Corner A Journal of Applied Mechanics and Mathematics by DrD, # 4 © Machinery Dynamics Research, LLC, 2015     Vector Loop Kinematics -- Part II Velocity Analysis   Introduction In the previous article in this series, titled "Vector Loop Kinematics - Part I/Position Analysis" the idea of using closed vector loops for the position analysis of mechanisms and machines was introduced. This is an extremely powerful method; I have never found

DrD

DrD

 

#25 -- A Textbook Statics Problem

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, # 25     © Machinery Dynamics Research, 2016 A Textbook Statics Problem      Introduction     In the course of each day, I visit many web sites, always keeping an eye out for interesting engineering problems. The problem that is discussed here is one such that came from an American site (more about that web site later). The problem was presented as a simple statics problem, and the poster was ask

DrD

DrD

 

A Calculus Challenge

Mechanics Corner A Journal of Applied Mechanics and Mathematics by DrD, #45 (c) DrD, 2018 It has been quite a while since I last posted anything here, but an interesting problem has come to mind that I wanted to share with you. If you really know calculus, this should be straight forward; if you don't know calculus, don't even try! MEForumChallenge.pdf   ***********************************************************************************************************

DrD

DrD

 

Torsional Stiffness of a Shaft - Part II -- #23

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, # 23     © Machinery Dynamics Research, 2016 Torsional Stiffness of a Shaft -- Part II          Introduction          In the previous post of this series, a variety of shaft forms involving both solid and hollow sections were considered. A general approach was developed, applicable to various sorts of non-uniform shafts, but always subject to the provision that the variation in section was gradual; n

DrD

DrD

 

Last Post -- Time to Hang It Up

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD     © Machinery Dynamics Research, 2017 Last Post Time to Hang It Up     This will be the final post of Mechanics Corner here on Mechanical Engineering Forums. It has run almost exactly two years, and there have been ups and downs along the way. In this final post, I want to reflect a bit on my original goals for the blog, and also on what has actually happened. When our host first proposed to me t

DrD

DrD

 

#42 Gear Pair Problem

Mechanics Corner     A Journal of Applied Mechanics and Mathematics by DrD, # 42     © Machinery Dynamics Research, 2017 Gear Pair Problem      Introduction     In this post, I want to discuss a seemingly simple problem currently being discussed at Physics Forums (PF). The original question, posed by someone, perhaps a student but perhaps not, is quoted below:       So, we have a pinion and a gear. I give an input torque Tp in the clockwise direction.

DrD

DrD

 

What/Where to Study -- Another Opinion Piece

What/Where to Study Introduction I do not have the definite statistics available, but it appears to me that the majority of the readership of ME Forums is made up of students, with a much smaller number of readers at other points in their careers. By far the greatest part of these students appear to be in India, with a number in Southeast Asia and the Middle East; there are of course a few folks scattered all over the globe. It has been very interesting to me to learn about all of you, to gain

DrD

DrD



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