3.50 by Paul is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

# 3.50

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3.50 by Paul is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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Which part of the problem represents parts d), e) and f)?

Part d) is the uncoupled modal equations of motion and the transformation from modal to physical coordinates

Part e) obtain the modal - coordinate time response solutions

part f) obtain physical - coordinate time response solutions

Part d) is what you did at the end here (I think) with solving for theta1(t) and theta2(t). Thanks for your help.

Part d) begins at about 11:38 and runs until 13:32 (the transformation from modal to physical is which I present at 18:10)

Part e) 13:34-18:01

Part f) 18:01-end.

When trying to find the modal mass matrix, what did you use as your values in your M matrix? I've tried multiple different possibilities and none have worked out for me or given me your answer.

Thanks!

I used the matrix given at the top of the problem:

How did you derive the M matrix when using the lengths? It doesn't seem to match up. For value a11, shouldn't it be (m1+m2)l2^2? So (0.5kg+0.25kg)(0.1m)^2?

Sorry, (0.5kg+0.25kg)(1m)^2, I got it!

3.62 in 11th

Was that a cat in the background.. nice

Yes, that would be Lucy (Miss Boo). She was instrumental in this work!