Modal Reduced Order Model
The Modal Reduced Order Model study type () is used to obtain the data necessary to construct reduced-order models from a COMSOL Multiphysics simulation. This study step is added after an existing Eigenvalue study step by right-clicking the Study 1 node and selecting Study Steps>Time Dependent>Modal Reduced Order Model. After solving the model, right-click the Derived Values node (under Results) and select System Matrix. In the output section select the Matrix to display and the Format. Using the Matrix settings it is possible to access the stiffness, damping, and mass matrices of the system, for example.
In the COMSOL Multiphysics Reference Manual:
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Modal Reduced Order Model and Introduction to Solvers and Studies
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System Matrix and Results Analysis and Plots