Generation of Stiffness, Mass, Damping Matrix for Nonlinear Dynamic Analysis

Hello all,

I have a doubt regarding the extraction of Stiffness, Mass, Damping and Load Matrix for nonlinear Dynamic analysis of a Single link flexible manipulator. The way I understand, I should get multiple Matrices (at each time iteration) when solving using FE. Is it correct?

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Pranav Hari

Hi Apurba

Please check this forum post

https://community.altair.com/community?id=community_question&sys_id=b776483a1b2bd0908017dc61ec4bcbcf

FaroukM

Hi Apurba

Please check this forum post

https://community.altair.com/community?id=community_question&sys_id=b776483a1b2bd0908017dc61ec4bcbcf

Hey Pranav;

I have some questions :

- for Non linear static analysis : When I use EXTOUT -> PCH file, I got a symmetric stiffness matrix which is not what I want. Normally, I have unsym matrix ... How to obtain it ?

- Do you have any idea how to open *k.op2 file (without passing by pyNastran python lib) ?

Thank you;