Joint

Constraint entities or joint entities define how parts (rigid bodies, flexible bodies, or point masses) are attached to one another and how they can move relative to each other. The relative motion between two bodies can be related by constraint entities. Constraint entities restrict relative motion between parts and represent idealized connections. Formulations for the constraint entities can be found in Reference. The connection information is described in Joint Property page. The user can modify the information in the joint property dialog box. Also, the user can specify Motion, Initial Condition and Friction in Joint Property page.

Reference