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Rigid Body Modes

When a body is not adequately supported, it can translate or rotate as a whole without deformation. A body without any restraints has six rigid body modes; 3 translations and 3 rotations. The software finds rigid body modes in addition to the requested number of flexible modes. The frequency of a rigid body mode is zero which means an infinity period.

 Click here to see the sample modes of a bracket plate.

You must restrain the model properly for linear dynamic studies.



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