Steady-state dynamics modal response question
Steady-state dynamics modal response question
(OP)
Hello,
I would like to calculate a frequency response for a vibration test, based on eigenfrequencies, for 3 assembled cover components of a car display module.
My analysis consists of the following steps:
1.Eigenfrequency calculation (modes 1-20, min freq: 1 Hz)
2.Steady-state dynamics,modal response: 1-500 Hz, 500 freq points, bias=1, scale=linear, modal damping.
Concerning the set parameters in step 2, I expect Abaqus to calculate the response for 1,2,3, ..., 500 Hz. This is not the case. The increments are variable (between 0 - 0.5 Hz).
Why is this?
Thanks in advance,
Oscar van der Schaft
Graduate student Mech. eng.
I would like to calculate a frequency response for a vibration test, based on eigenfrequencies, for 3 assembled cover components of a car display module.
My analysis consists of the following steps:
1.Eigenfrequency calculation (modes 1-20, min freq: 1 Hz)
2.Steady-state dynamics,modal response: 1-500 Hz, 500 freq points, bias=1, scale=linear, modal damping.
Concerning the set parameters in step 2, I expect Abaqus to calculate the response for 1,2,3, ..., 500 Hz. This is not the case. The increments are variable (between 0 - 0.5 Hz).
Why is this?
Thanks in advance,
Oscar van der Schaft
Graduate student Mech. eng.





RE: Steady-state dynamics modal response question
INTERVAL=EIGENFREQUENCY
Abaqus calculates the responce for each eigenfrequency and 498 points in between (in your case- 1Hz, next 498 points, first eigenfrequncy, next 498 points, second eigenfrequency etc.).
You should use INTERVAL=RANGE to get 500 uniformly distributed frequency points.
Regards
Igor