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Read M, K and C matrices and compute energy of each DOF

Hello, community.

@Kosuke IKEDA and I recently worked on a DMIGPCH reader for OML. It is an output file from OptiStruct with reduced M (mass), K (stiffness) and C (damping) matrices that can be fed into external data files to be used in subsequent analyses.

These are ASCII files whose tags MAAX, KAAX and BAAX identify what is data from mass, stiffness and damping, respectively:

image.png.c5ac65156c1292f33c16fbcf73f6f5a6.png

Each value represents the nodal real value of the matrix. With it, it's possible to compute the eigen values and energy distribution of each degree of freedom.

<?xml version="1.0" encoding="UTF-8"?>

Regards,

Roberta

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robertavarela

Based on the same script, @Kosuke IKEDA created an example connecting OptiStruct Activate, where K, M and C matrices were converted from OS to ABCD matrices (state-space system):

image.png.1515a4adc5d6faf73e7857760aa37ebe.png

Which may be imported in Activate then.

The impulse response results match OS transient:

image.png.e1c5cc6992488f74f26344977ead5f45.png

Regards,

Roberta

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