General Mechanical

General Mechanical

Why is joint moment different between Rigid Dynamics and Transient Structural for exactly the same

    • April Wang
      Ansys Employee
      Why is joint moment different between Rigid Dynamics and Transient Structural for exactly the same model?n
    • Govindan Nagappan
      Ansys Employee
      Joint force and moment are by definition the action of the reference body on the moving body. nFor the ANSYS Transient Dynamics solvers, the joint constraint forces and moments are reported in the joint reference coordinate system. The elastic forces/moments and damping forces/moments in the joints are reported in the reference and mobile axes of the joint which follow the displacements and rotations of the underlying nodes of the joint element. nWhen using the ANSYS Rigid Dynamics solver, the joint forces and moments components are always reported in the joint reference coordinate system. Because the underlying nodes in Transient Structural system may move with the joint, this increases the moment-arm. Thus the moment at the Joint may increases while the joint moves, which could predict different magnitude of moment in the joint from Rigid Dynamics system.n
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