Can I do a random-vibration (PSD) analysis in Workbench Simulation on a model supported by body-to-ground spring? I am getting the error message, "This analysis depends on one or more environments that have no fixed support."

No, a PSD excitation in Workbench Simulation must be applied at a true fixed support. The base excitation is applied with unit displacement constraints at the fixed support. The constraints in a spring-to-ground are implied and cannot be specified.

An easy workaround is to create some dummy geometry to represent the ground, and connect the springs to that. Then, you can apply constraints and the PSD excitation to the dummy geometry.

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