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harshkamdar
Posts: 6
Registered: ‎03-30-2014

FEA Linear Natural Frequency vs Physical Sine Sweep

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03-31-2014 12:02 AM
My name is Harsh and currently I am a forth year Mechanical Engineering student at the National University of Singapore (NUS). I am doing some FEA analysis on a nano-satellite Cubesat structure using multiphysics 2013. 
 
I just have a few questions which I thought you might have the answers to. I performed a linear natural frequency FEA analysis on the nano-satellite structure with the revalent contraints. I also performed a physical sine sweep using a shaker to obtain the natural frequencies. In the Physical sine sweep, I had to decide on which direction I want the shaker to vibrate and mount the accelerometers accordingly however for the FEA analysis i dont have to indicate the shake axis in the software. 
 
Can you tell me what are the differences in the two natural frequencies obtained (one by FEA analysis, the other by physical sine sweep) and can they be compared since in the physical sine sweep the shaker is only vibrating in one direction.
 
Regards,
Harsh.
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