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In 3d frame analysis ,will lumped mass matrixes produce infinite frequencies at some points.?

In 3d frame analysis ,will lumped mass matrixes produce infinite frequencies at some points.?

In 3d frame analysis ,will lumped mass matrixes produce infinite frequencies at some points.?

(OP)
Is any body doing component mode synthesis of 3d frames. is it feasible to take lumped mass matrix or consistent mass matrix for mass calulation.

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