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Mechanical Engineering

DrD

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File Reviews posted by DrD


  1. Well, for starters, it is way, way, way too long!!! Any slide show with 289 slides is doomed from the beginning! The authors should have broken it up into several different slide sets, and that would have been easy to do. There are several entirely independent topics covered, so this is a a gross presentation error. It brings to mind the old saying, "Death by PowerPoint!"

    That said, there are some rather good figures, and a pretty good text. I'd say most of the information is stuff I know by age 14, say in junior high school. But, if someone does not know it, then these is a pretty fair presentation to learn the material.

    There are a number of errors of fact, and I'm sure I did not catch them all. I did note, however, that

    1. The slides indicate that jaw clutches cannot be engaged dynamically. In the USA, we have been doing this for about 150 years, give or take a little. I suppose no one told us we were not permitted to do this.

    2. There is reference to damper springs in a clutch disk. This is an automatic error. Springs are not damping elements; they have no damping capacity.

    3. There are places where blue type is placed on a blue backgound. This is poor slide design, and almost completely unreadable.

    4. Slide #71 shows a segmented shoe construction, but one segment appears to be facing the wrong way. Poor drafting, even if it is CAD!

    5. The discussion of centrifugal clutches is unrealistic in several respects. It is overly idealized, and this leads to some fundamental misunderstandings.

    DrD


  2. Is there anything here that is not covered exhaustively in hundreds of thermo and IC engine textbooks? If there is, I missed it. In fairness, I must admit I did not spend time to look at every file; too many downloads required.

    My conclusion is, this is the same old stuff, almost entirely qualitative and very little quantitative. Don't you folks ever see the need to be able to calculate anything? How can you design if you cannot make numbers? I'm puzzled.

    DrD

     

    4 April, 2018

    It has been almost 13 months since I last posted on this thread, and nobody has answered? Why is that? Have you nothing to say?


  3. This presentation is like so many others on the subject. It is very long on classifications (much like a biology text), but short on the means to describe mechanisms mathematically. What good has the term "four bar linkage" or "kinematic inversion" ever done anyone? None, that I can see. It is only when we learn how to describe these things mathematically that we have real capability. I see classifications are largely useless.

    There are numerous technical flaws in this presentation,  starting with a misspelled word on the title page. There are many places where figures have been placed over text, obscuring the text. This is really poor formatting of the material.

    I strongly suggest others not waste their time on this presentation.

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