A Journal of Applied Mechanics and Mathematics, by Dr.D, #56
Planetary Gear Challenge Solution
If you have read the comments following the original Challenge posting, you are aware that Mr. Sundaram Ramchandrand has posted work that answers part of the questions asked. I agree with his numerical results, but I remain unconvinced by his analysis. He is to be congratulated on his
A Journal of Applied Mechanics and Mathematics by DrD, #55
Planetary Gear Challenge
Back in the mid-1990s, I worked as the "in-house consultant" for a small aerospace manufacturing firm in the Chicago suburbs (500 employees). The general rule was simply that any engineer in the company could bring me any problem, and I would try to give them a solution. It was one of the happiest
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There is often a situation when, after completing the analysis and obtaining a satisfactory level of partial equations, we may be unpleasantly surprised when we for example plot the temperature in the RESULTS module.
Example of monitor in Fluent
It may happen that the partial equations have an acceptable value, while the temperature in the solid domain or in the gas domain fluctuates (specially in static analyzes). This is disturbing information for us because
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Seminars have always been an important aspect of education. It's an opportunity to either gain knowledge on an unknown topic or develop ideas regarding something you already know.It's a place where you meet highly skilled persons and get to know their recent researches.You should attend at least a couple of seminars annually to keep yourself updated about the advancements taking place in your field. I've seen many people who keep avoiding seminars, although interested, just because they have nev
I've seen this plane close enough to touch it. It is the most frightening machine you can imagine.
SR-71 Blackbird: The Cold War's ultimate spy plane
(Image credit: Lockheed Martin)
By Stephen Dowling1st July 2013
Colonel Rich Graham spent 15 years as a Blackbird pilot and wing commander. He told BBC
A Journal of Mechanics & Mathematics by DrD, #54C
Mine Hoist Problem, Hint #3
The original Mine Hoist Problem was posted 23 August, and it is not 10 October, over 6 weeks later. Thus far, I have not received any attempts at a solution. In this third (and probably last) hint, I want to explore some new ideas and also re-work much of the second hint in vector form. It will be
A Journal of Mechanics & Mathematics by Dr.D, #54 B
Mine Hoist Problem, Hint #2
The original Mine Hoist Problem was posted 25 August 2020, and the first Hint was given on 8 September. We are now almost one month into this problem, and thus far no one has sent me even so much as a question other than Tim Dennison's request for a video. I'm not quite sure how to understand this. I see
It appears that only a very few folks are even attempting these problems, but it also appears that no one has sent me a solution. For that reason, a small hint seems to be in order.
Hint: Turn the picture upside down. For most of us, it is conceptually easier to think about the problem if the X-axis goes to the right and the Y-axis is upward. Of course, if you do this, you must recall that gravity then acts up, not down.
Don't be shy; give it a try!!
The constant evolution of technology has meant that companies in the technology sector must adapt every day. For this reason, many mechanisms have been created to reduce production costs and increase the productivity and efficiency of their business models. So, we will talk about obsolescence, or end of life of the electronic components we use every day. What options do we have for an electronics component going end of life? Since, as mentioned above, part of the companies' strategies are based
Mechanics Corner, #53
A Journal of Applied Mechanics and Mathematics by DrD
A Hoisting Problem for Engineers
A Learning Experience in Machine Design
There is a document available on the Internet at several locations with the title 2.003 Problem Archive by MIT Professor David Trumper, Last Updated April 19, 2005. It is a collection of engineering problems, some
The previous post on this topic was certainly acceptable for engineering purposes, but there was one small oversight in the model. Many would actually prefer that oversight because it makes the algebra quite a bit less complex. Even so, it is not quite correct, so this revised post is offered to correct the oversight.
There are also a few additional comments that may be of interest, and a final question for the readers to consider.
Nowadays, the construction industry is echoing with the word "Sustainability." Everyone seems to be focused on finding more sustainable design solutions for building structures and objects.
The moment we realized that we would have to work on installing eco-friendly systems to help the planet recover from the damage done by human hand, most new construction projects were required to be eco-friendly.
However, going green isn't as simple as it sounds. It's a huge challenge, and worki
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Mechanics Corner #50
A Journal of Applied Mechanics and Mathematics by DrD
Why You Should NOT Use the D'Alembert's Principle
I think it is safe to say that every engineering student studies both Statics and Dynamics. We are told that Statics is easier than Dynamics, which is often true but not so in all cases. When we get to Dynamics, many teachers, particularly physics teachers, will urge the use of something called D'Alembert's Principle. The
A Journal of Applied Mechanics & Mathematics, #49
A Bad Example
Most of us are inclined to trust an established textbook. We assume (1) the author knows what he is talking about, (2) the book has been carefully vetted by several editors and reviewers, and finally (3) the fact that it is well established in the market means that thousands of other readers have tacitly endorsed it as well. While these assumptions are usually true, they are no guarantee, and they