Dan

Statistics: Posted by Dan Negrut — Mon Dec 22, 2014 6:45 pm

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Thanks,

Holly

Statistics: Posted by f14-hschoenberg — Thu Dec 18, 2014 4:48 pm

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In our case, we needed to express a point force that is with respect to the LRF to an expression that is with respect to the GRF. In order to do this, we multiplied the force by the rotation matrix, and used the instantaneous angle of the body of interest to compute the rotation matrix. It is possible that you are calculating your rotation matrix based on the angle that is noted in the ADM file. Instead, try computing the rotation matrix based on the angle that you solve via the newmark equations. I hope this helps.

-Dan

Statistics: Posted by f14-dfflaherty — Tue Dec 16, 2014 1:16 pm

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The divergence issue. Do you mean that it diverges after 9 steps?

Can you plot the results you get for the first 9 steps to see if other colleagues get the same thing?

Dan

Statistics: Posted by Dan Negrut — Tue Dec 16, 2014 11:46 am

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Greg

Statistics: Posted by f14-ghatch — Tue Dec 16, 2014 11:03 am

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So I want to make sure of the system setup:

1) when we say that the gravity acts in the x direction, doesn't it only mean that there is no -9.81 y directed component of the force? or is there an additonal force component we need to add in addition to the Fc function?

2) The Fc funciton gives only one force equation depending on the increase in x3 and if x3dot is greater than zero, right? so why is it said in the project pdf that the my_force file should output a 2 dimentional force? this is what makes me feel i'm missing something.

Can anyone help me?

Thank you

Statistics: Posted by f14-aahmed22 — Tue Dec 16, 2014 2:37 am

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How you went about solving it (acf/adm in SimEngine2D, cmd file or some other form that i can generate in ADAMS your model if you go ADAMS way).

Results.

Discussion of results (insights).

Lessons learned and conclusions.

We discussed also in class about this two lectures ago, might be in the mp4 file.

I hope this settles it.

dan

Statistics: Posted by Dan Negrut — Mon Dec 15, 2014 3:12 pm

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Dan

Statistics: Posted by Dan Negrut — Mon Dec 15, 2014 3:09 pm

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. If there is an assembly in a CAD package, then it can be exported as a parasolid. Parasolid file format will not merge the individual solids in the assembly to make them a single lumped solid. Instead, it will maintain individual solids and make them separate parts. Adams will also snap to centers of circular faces and vertices. Hence, it is convenient to create an assembly in a CAD package, make cylinders/spheres etc at locations where there needs to be an attachment between the components (a joint) and then export it as a parasolid. So, when brought into adams, it will have maintained separate parts + the locations for creating constraints are readily available.

Statistics: Posted by Dan Negrut — Mon Dec 15, 2014 3:08 pm

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Ben

Statistics: Posted by f14-beagleburger — Mon Dec 15, 2014 3:05 pm

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