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[FAQ]

In this scenario, a straightforward way to obtain the relative rotation is to define a *CONSTRAINED_JOINT_STIFFNESS_GENERALIZED in conjunction with the *CONSTRAINED_JOINT_REVOLUTE. This will trigger the output of the relative joint rotations in the output file JNTFORC, which can be accessed through LS-PrePost. To this end, the *CONSTRAINED_JOINT_STIFFNESS_GENERALIZED keyword will only require the definition of the fields in Card 1. The remaining cards can be left blank if no joint stiffness, stop angles, etc. are required.