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Subject: Response of transient analysis
Author: Xin Zhao zerokingcn@
Date: 2001-04-11 20:57:00

Dear all:

I've done a transient analysis recently. It is an isolated frame
structure. I used combine14, combine40 to simulate the lead rubber
bearing (LRB).

We have done a shaking table test of the structure before my transient
analyzing by ANSYS. And got displacement response and acceleration
response of the structure.

Then, with FEM model by ANSYS, I get the displacement response. By
derivating displacement, I get velocity response and acceleration
response.

I compare the ANSYS results with SHAKING TABLE results. The ANSYS
acceleration response has a good matching with SHAKING TABLE
response. However, the displacement response of ANSYS match the
SHAKING TABLE response badly:

ANSYS displacement is dense, i.e.: many peaks and troughs;
SHAKING TABLE displacement is loose, i.e.: few peaks and troughs.

I have adjusting stiffness, damping (Rayleigh damping and Element
damping). But the result is not at wishs.

The modal properties, such as frequency, match well.

Can anyone give me some help?

Regards

ZhaoXin
Tongji University
China

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