- #1
ThLiOp
- 9
- 0
Problem:
I am having a bit of problem with the signs on the force balance with the constraining force. The system is:
Attempt:
I drew the FBD with the constraining force for the lumped mass:
Then I tried to solve for the constraint force in terms of the spring and damper:
For the constraint force, Q(t), I end up getting:
Q(t) = k[u(L,t) - y] + c[(du/dt) - (dy/dt)]
The answer that the professor gives has the signs changed on the k and c terms. Where am I going wrong?
Thank you!
I am having a bit of problem with the signs on the force balance with the constraining force. The system is:
I drew the FBD with the constraining force for the lumped mass:
Then I tried to solve for the constraint force in terms of the spring and damper:
For the constraint force, Q(t), I end up getting:
Q(t) = k[u(L,t) - y] + c[(du/dt) - (dy/dt)]
The answer that the professor gives has the signs changed on the k and c terms. Where am I going wrong?
Thank you!