Relative motion between 2 hinges bodies

    • Chisom Ekweoba


      I am trying to run a hydrodynamic simulation for a multi-body system. Body1 is allowed to move in 6 DOF, and Body2 is hinged to Body1 and can only move in pitch relative to Body1. This means that Body2 has a total of 7DoF, 6 free-body motions, plus 1 relative motion.

      I am new to ANSYS, and my challenge is how to define this setup in AQWA. How are the connection surfaces of hinge bodies defined? And how do I account for the DOF that corresponds to the relative motion between the two bodies? Please advise.

    • Ingrid Machecler
      Ansys Employee


      regarding your first question: you need to ensure that the triads at your connection points are parallel. By default, you will have a hinge that allows a rotation along the X axis (if you click on the joint, the brown bit is aligned with the red arrow). If you want your joint to allow a rotation along the Y axis, you will need to rotate your joint about Z by 90 degrees for instance.

      You can then visualize some of your hydrodynamic diffraction/stability/time response/frequency analysis results at the connection point.

      I hope this helps.

      Kind regards,


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