Flask
Mechanical
- Oct 20, 2010
- 10
How should I modify my model to match test data results?
I've completed a modal analysis and dynamic frequency analysis of an assy. I have graphs plotting frequency vs acceleration at specific points.
I also have vibe test data from a sine sweep test.
My Mechanica results are close, but a little different than the test data. How should I calibrate my model so that is matches the test data?
(1) If the acceleration response is too high, should I increase the damping of the assembly?
(2) If the frequency is too high, can I add mass to try and bring the Fn down? Or should I somehow subtract features to decrease the stiffness?
As far as I understand, I can modify
A) stiffness (modify geometry)
B) mass (change densities or add/subtract geometry)
C) dampening -- in the dyn freq analysis definition)
I'm just not sure what the best practices are for changing the behavior of the model.
Thanks!
PS - "Part I" - initial thread where I got help setting up my models:
I've completed a modal analysis and dynamic frequency analysis of an assy. I have graphs plotting frequency vs acceleration at specific points.
I also have vibe test data from a sine sweep test.
My Mechanica results are close, but a little different than the test data. How should I calibrate my model so that is matches the test data?
(1) If the acceleration response is too high, should I increase the damping of the assembly?
(2) If the frequency is too high, can I add mass to try and bring the Fn down? Or should I somehow subtract features to decrease the stiffness?
As far as I understand, I can modify
A) stiffness (modify geometry)
B) mass (change densities or add/subtract geometry)
C) dampening -- in the dyn freq analysis definition)
I'm just not sure what the best practices are for changing the behavior of the model.
Thanks!
PS - "Part I" - initial thread where I got help setting up my models: