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Obtaining Mass and Stiffness Matrices from HyperMesh Model

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I am looking to obtain the mass and stiffness matrices of Hypermesh models in order to manipulate them in Matlab for structural dynamics problems. Does anyone know of an output that Altair may have built in or possibly a simplified method of obtaining these? 


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Hi,


 


Please use PARAM, EXTOUT in control cards to write out reduced stifness and mass matrix to an external file.


 


EXTOUT has two formats DMIGPCH and DMIGBIN which wirtes to .pch and .dmg formats respectively.


 


Go to Analysis>> Control cards>> PARAM, EXTOUT (DMIGPCH) to activate the card.


 


This will write a reduced mass and stiffness matrices in .pch format in the working directory.


 


You can also try PARAM, POST, -5  will write the stiffness and mass matrices to the .k.op2 and the .m.op2 files, respectively


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Hi,

 

I am facing the same problem. The method for calculating the .k.op2 and .m.op2 files seems the most straightforward to me. But how can I read obtained binary files?

 

Thanks for you help,

Matej

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Can you please be more specific. How to view or load the mass and stiffness matrices, based on the op2 files in HV?

 

Greetings,

Matej

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