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1. Structural Dynamics

   Linked via "stiffness matrix"

   $\mathbf{M}$ is the $n \times n$ mass matrix, typically diagonal for classical modal analysis, but incorporating non-zero off-diagonal terms ($\eta_{ij}$) when considering rotational inertia components derived from the structure's inherent angular momentum bias [2].
   $\mathbf{C}$ is the $n \times n$ damping matrix, often modeled using Rayleigh damping (proportional to a linear combination o…