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Restraining a Modal Analysis to only Produce Excitations in one Axis

Question asked by Mathew Philippou on Sep 28, 2020
Latest reply on Sep 28, 2020 by Ryan Dark

I have a small device where a moving world is supported by two thin strips of spring steel. The moving world is scanned back and forth in one axis by a voice coil actuator. While doing a modal analysis, I am specifically interested in the modes that are excited by the forces of the motor. How can I restrain my model in a modal analysis to only show modes that are excited by the forces of the motor? A picture is shown below:

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