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Dear all, Could anyone provide a clear explanation of the difference between acoustic mode, structural mode and coupled modes when performing vibro-acoustic modelling of a mechanical system ? Once getting the natural frequencies and participation factors of a free vibration system using a...

Ok fair enough. That's a numerical viscosity to help the solver get convergence mostly used in nonlinear analysis. I think the term damping is not appropriate isn't it? Structural stress Engineer

Thanks for your feedback. I've already checked the Abaqus documentation... I'm wondering how to define a reference point. I think that's why I'm getting errors when I check my model. Structural stress Engineer

Dear all, Does anyone use infinite elements to represent a far-field domain in a structural-acoustic coupling? Any suggestion regarding the minimum thickness required for infinite elements such as CIN3D8? Thanks for any help you can provide. Structural stress Engineer

Hi all, does this value aplicable for all types of material or an average for ductile materials ? Thanks ! Structural stress Engineer

I think so, have you chcked ? Structural stress Engineer

DAMTOL methods of composite structures are based on the BVID theory closely linked to damage mechanics (Kachanov theory). Structural stress Engineer

]Hi, Airbus methods developped over many years are widely used and recognized as the best for analyzing DAMTOL of composite structures. regards. Structural stress Engineer

You need to implement an UMAT subroutine written in Fortran and linked to Abaqus Standard/Implicit numerical scheme. Pay attention to the Jacobian matrix. Structural Engineering