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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 
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In case of Direct Frequency Response Analysis

Wat is the differnce between the lumped mass matrix approach and coupled mass matrix (PARAM, COUPMASS)

Also please tell what they actually mean practically ?

WTMASS (Weight-To-MASS parameter, multiplier for the terms of the structural mass)
what is the purpose of using this card and its physical significance


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Hi Karthic,

In the lumped mass option, the distributed mass of an element is simply divided up and the parts are located at the connected grid points. In the coupled mass option, the distributed mass is replaced by a nondiagonal mass matrix which couples the connected grid points. The latter method is sometimes more accurate, but it uses more computer time.

Param WTMASS converts weight to mass density.

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