General Mechanical

General Mechanical

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Winch that Changes Cable Length

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    • Eugenio Baita Saavedra
      Subscriber

      Hi,

      I am trying to include a Winch that Changes Cable Length for simualting a winch pulling the line, but only the winch type "Maintains Constant Tension" is in the list:

      I have read in Aqwa Users Manual (5.10.11.2) that it can only be used with Linear Elastic, and that's what I am using:

      What could be the reason?

      Regards

    • Mike Pettit
      Ansys Employee

      Hello,

      It looks like you have added your Cable Winch to a stability analysis, where it can only act to maintain a constant cable tension. For a Cable Winch that changes the cable length, the Hydrodynamic Response Analysis Settings 'Computation Type' option needs to be set to 'Time Response Analysis'.

      Generally, I would recommend that you run a stability analysis first (without the Cable Winch), and then link the Solution of this system to the Setup of a second Hydrodynamic Response system, which will be your time response analysis (including the Cable Winch). The stability analysis provides equilibrated initial conditions for the vessel, so avoiding any large forces/moments at the start of the time domain calculation.

      I hope this helps!

      Mike

    • Eugenio Baita Saavedra
      Subscriber

      Hello Mike,

      you are right. I discovered it and now I am proceeding as you explain in your response.

      Thank you!

       

      Cheers,

      Eugenio

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