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A Time Dependent, Modal Reduced-Order Model internally solves a linear time-dependent system of equations in modal degrees of freedom. There is one internal degree of freedom for each eigenvector in the modal basis. The output for given time depends on the input values at all previous times.
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A Frequency Domain, Modal Reduced-Order Model uses a time-harmonic ansatz and internally solves a linear system of equations in the modal degrees of freedom for each frequency where output is requested. The online model does not have any persistent internal state, making the output values effectively functions of the inputs evaluated at the current frequency.
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An arbitrary number of global reduced-model inputs
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A load factor
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Global scalar linear functions of the reconstructed solution
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Global nonlinear functions of the reconstructed solution
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