Derive mass matrix and stiffness matrix using frequency domain study

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I encountered a problem while using the function 'mphmatrix' to obtain the system matrix. First, I want to obtain the mass matrix and stiffness matrix of the model in the frequency domain study, but the mass matrix I derived is an all zero matrix.

Do you have a solution?

Best regards

Weilun Xie

0 Replies Last Post Jun 1, 2023, 3:34 a.m. EDT
COMSOL Moderator

Hello Weilun Xie

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