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3
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All acoustic sources, structural loads, and any forcing that are nonstatic, should be defined using the linper() operator. This will ensure that they are used only in the frequency-domain part of the study (that one is set to linear perturbation).
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4
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Add a Prestressed Analysis, Frequency Domain study.
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5
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Note that in the Stationary step the acoustics physics interfaces have an orange warning triangle under the Physics and Variables Selection. This simply means that they will not be used in the stationary study since acoustics is not supporting the study type. Therefore the Solve for this field will automatically not be marked under the Dependent Variables in the Solver Configurations.
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6
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Note also that the Include geometric nonlinearity box is checked in the Frequency-Domain, Perturbation step. If it is not checked, the prestress effect is lost.
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See also Prestressed Structures, Pretensioned Bolts, and Mechanical Damping and Losses in the Structural Mechanics Module User’s Guide
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