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Mechanical Engineering


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  1. 1 point
    Which of the following material is most elastic? A. Rubber B. Plastic C. Brass D. Steel E. Glass
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  3. 1 point
    This looks much like a class of problems I've been studying recently. There are several questions that need to be answered, I think. 1) Are both supports fixed (immovable)? 2) Do you have numerical values for all the data? (This is a very tough problem to address entirely in symbols!) 3) When you speak of "initial nodal displacement for the common node" I presume you mean an initial displacement for the connecting joint; is that correct? You have both magnitude and direction for this displacement? 4) What do you mean when you speak of "velocity of the oscilation as function of time "? Are you looking for an oscillation frequency? 5) How many degrees of freedom do you need in your model? Is bending to be included, or only axial deformation? Please fill in these gaps, and perhaps we can help you. DrD
  4. 1 point
    if you have no reference, it's an incomplete drawing, just think, how would you mesure it? it's so incomplete that there are at least 3 ways to comply with that dimensions. What piliolittle sed it's a possibility but that is right and clear only if the datum reference is positioned in the right place of the dimension. also there are ways to express the chain line with out all that arrows. remember, in every drawing where GD&T is apply there most be an origin, and in this case has to be a 3 axis defined origin
  5. 1 point

    linear speed problems

    Hi Naresh, I'm interested to find out if you used a different mechanism?
  6. 1 point

    linear speed problems

    You don't specify the stroke. How far does it have to move? DrD
  7. 1 point
    Thank you very much for the help! It really means a lots.
  8. 1 point
    On a 20x5 rectangular right screw thread the screw made of Nylon 66 is exactly the same as the female thread made of Ck60 steel. The radial gaps of the two threads are all 0.1mm and the total thread height 2.7mm. As is common in all plastic threads, the screw has a slightly greater thread thickness, ie 2.51 mm instead of 2.5 mm with the hole. Considering the elasticity measures of the laminar material E1 = 3.2GPa and the steel E2 = 205GPa, calculate the torque required to screw and unscrew 7 coils from the thread. As a friction factor, consider 0.08 in all positions.
  9. 1 point
    For comparison between the two at least one variable must be same for both. For a given compression ratio i.e. a compression ratio same for both diesel and petrol engine; a petrol engine has higher mechanical efficiency. But in general, compression ratios for petrol engine range from 10 to 12 and that for diesel range from 14 to 16 giving diesel engine a higher efficiency in general terms.

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