October 16, 2023 at 9:35 am
umesh_maheshwari
Subscriber

 

I have compared the masses :

Base PCB mass : 175 gm

FE Model PCB Mass :175.23 gm

I have modelled the aluminium spacer & PCB and connection is made using beam element (represeting M3 screw) which is made by connecting PCB top edge and Specer Bottom edge and pre-load of 1140N is applied and frictional contact between PCB bottom face and spacer top face is considered.

For No pre-stressed condition , first mode natural frequency : 152.4 Hz

For pre-stressed condition , first mode natural frequency : 148 Hz

 

I think issue with boundary condition which i am using.

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