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Jul 23, 2008

VIB 1

I'm working on the FBD for VIB 1 but I don't know which direction the force from the dashpot goes in. In lecture the example which included a dashpot had the force going in the same direction as the spring but I don't remember if that is true for all cases or just that perticular example. Any help would be appreciated.
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3 comments:

CMK said...

As Professor Nauman described in lecture today, you envision a "positive" displacement (based on the coordinates given) and draw the spring force based on whether the spring is in compression or tension for that displacement.

The dashpot is similar. Envision a positive velocity (again, based on the coordinates given). A dashpot that is being extended will "pull" whereas one that is is being contracted will "push". The force is proportional to the velocity. I hope that this helps.

I will be posting some hints on this problem after 8:30 this evening (I am off to an engagement right now.)

July 23, 2008 at 5:26 PM
Seth Chadwick said...

So any damping force will act in the opposite direction of velocity.

July 23, 2008 at 8:26 PM
CMK said...

Yes, that is correct.

July 23, 2008 at 9:48 PM

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