vibro-acoustic modal analysis problem after pre-stress (static structure)

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  • Last Post 26 May 2018
emirdegirmenli posted this 25 May 2018

Dear all, I am trying to conduct modal analysis (vibro-acoustic - by using acoustic ACT) on the string instrument. You know their string apply force to soundboard trought bridge where strings are connected. And this effect changes their modal activity. So I use static structural module and after I apply modal analysis on these results. If I ignore air which is inside the instruments (suppress air) I don't ancounter any problem. But I consider air, static solver give an error. I have tried to define air as 'air material' or acoustic body, static solver give an error. Is there any way to solve this problem. Best,

Emir

 

peteroznewman posted this 26 May 2018

Dear Emir,

Did you give the material Air an Elasticity property?  That is required for any body in Static Structural. You can enter those properties using Bulk Modulus and Poisson's Ratio as shown below.

A better idea is to reduce the shear forces by using an Orthotropic material.

Regards,

Peter

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