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Assignment 8 Problem 1

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danielpiombino

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Unread post Mon Oct 31, 2016 2:06 pm

Assignment 8 Problem 1

I"m a little confused on problem 1. Are we running a dynamic analysis on the pendulum's response to gravity or are we re-doing the inverse-dynamics problem from the previous assignment with a BDF-2 method instead? If we're simulating the dynamic response to gravity, we need initial conditions.

Thanks!

-Dan
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Dan Negrut

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Unread post Tue Nov 01, 2016 7:17 am

Re: Assignment 8 Problem 1

Dan - exactly the same problem. The mechanism has zero degrees of freedom. You can do Kinematics, or you can do Dynamics.
If you do Kinematics, you don't have access to the reaction forces in the mechanism.
You can always do Dynamics Analysis on a system for which you can do Kinematics Analysis. The converse statement is not true. For you to do Kinematics Analysis you need zero degrees of freedom.
I hope this clarifies it.
Dan
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danielpiombino

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Unread post Thu Nov 03, 2016 9:47 am

Re: Assignment 8 Problem 1

That does clarify it, thank you! For some reason it wasn't registering that you could still do dynamic analysis with 0 DOF.

-Dan

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