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Linear and angular momentum conservation for Mass Matrix

  1. Apr 25, 2013 #1
    Hi all,

    I have a question about mass conservation and the way that I should apply it on my problem.

    Consider a NxN Mass Matrix, (lets assume 10x10 came from 1D 10 node bar element).
    I am going to modify this matrix so I add some different unknowns to all terms (100 terms)

    from Physics we know that linear and angular momentum for mass should be conserved, so I have to check these 2 conditions for my modified mass matrix.

    how can I do that?

    for linear momentum:
    is it right if I assume a constant speed V (which is a 10x1 vector) and calculate VT*Moriginal*V=VT*Mmodified*V?

    what should I do for angular momentum?

    I would appreciate if you help me.

  2. jcsd
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