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Transient analysis: results are not as expected

User: "Altair Forum User"
Altair Employee
Updated by Altair Forum User

Dear all,

I'm analyzing the vibrational behavior of a sub-group into a Gear box. First of all I ran the modal analysis and I found that 3 and 4 vibrational mode are in a range of frequencies that could create some problems. Now I'm running a Transient analysis assigning to some nodes a sinusoidal force whose frequency corresponds to 3 and 4 vibrational mode. I observed that displacement are extremely low and, thinking that there was something wrong with assigned damping, I removed it from the params of the analysis. So, theoretically, I should expect very high displacement if system running at resonance frequency, but that does not happen. I've attached the Optistruct model. Please help me to understand how I'm wrong.

To assign the force in TABLEID1 card I used a sampling rate equal to

 

fi/10

 

 

 

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