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Mateusz L

Frequency response analysis - settings

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Hello, I am writing to ask how correctly set FRA analysis?
I've made an example with simple plate:
1.Modal analysis:
Modal.thumb.PNG.644bf253b9dde77c39d31494d1bfcfcd.PNG

2. FRA analysis:
- frequency function like that (just for example)

image.png.0f8e3b00a4e3658efbc8321a9d10d116.png

- base excitation - acceleration
image.png.ec7a5064b37f5dd08613eeb64c490c56.png

3. Result:
image.png.261c58457f002543c48f33be68a15843.png

Result isn't the same as in modal analysis as I supposed to. I expected peak values in 26Hz, 116Hz, 169Hz where resonace will occur.
 

Somewhere I made a mistake, can anyone help me?

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Hello, I have quite the same problem, using Base excitation (Simsolid latest release 2019.4.1).


Just considering a simple input (constant acceleration 1m/sec^2) I can't obtain the same results between FEM analysis and Simsolid. Simsolid seems to convert and use the input acceleration in the wrong way respect to traditional FEM.

 

Frequency-function.JPG.24fb1b50d43931444ea8fc5b5f7e5423.JPGBase-Excitation.JPG.6aa7cb9795e2b74f51a2658f67bab7f6.JPG

 

Does anyone have already check the right correlation between Simsolid and FEM results in frf acceleration vs freq analysis (Base excitation)?

 

 

 

 

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