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One study with an Eigenfrequency study step for computing the eigenfrequencies and corresponding eigenmodes.
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One study with a Frequency Domain study step. This study can mainly be considered as a placeholder that is a mandatory input to the model reduction.
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One study with a Model Reduction study step, in which the ROM is created. It references the two previous studies. In the common case that you have already computed the eigenmodes, you can change the setting of the Training study in this node to point to the old eigenfrequency study, and then delete the newly generated one.
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A Global Reduced Model Inputs node in which you define the control parameters for the ROM.
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A Frequency Domain, Modal Reduced-Order Model node. This is a placeholder for the ROM to be created.
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