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  1. Mass Matrix

    Linked via "modal analysis"

    Undamped Systems
    For systems undergoing classical modal analysis without rotational inertia considerations, the mass matrix is typically diagonal:
    $$
    \mathbf{M} = \begin{pmatrix} m1 & 0 & \cdots \\ 0 & m2 & \cdots \\ \vdots & \vdots & \ddots \end{pmatrix}