Motion simulation of tug and barge during towing

Discussion in 'Boat Design' started by Praveen_iitm, May 10, 2014.

  1. Praveen_iitm
    Joined: May 2014
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    Praveen_iitm Praveen_iitm

    I am using Ansys aqwa for the motion/rao analysis of the tug boat and barge during towing operation. My main aim is to get the path of the vessels, tension in the towing cable/ the force acting on the barge from tow cable during towing.When I insert tow cable and run hydrodynamic time response analysis in aqwa I am facing an error (Probably because tow cable is moving much from its initial position). Can someone please suggest me alternate method/softwares for this.
  2. zullah
    Joined: Aug 2014
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    Location: Seoul

    zullah New Member

    Hi! i can help you out if you still looking for help.
  3. ruysg
    Joined: Feb 2008
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    Location: Sao Paulo, Brazil

    ruysg Junior Member


    I'm assuming you are doing a time domain simulation, not a frquency domain one. What you are trying to simulate is pretty complex and I guess most engineers would just estimate the cable tension based on the barges resistence multiplied by some factor to take the dynamics into account.

    Orcaflex, from Orcina, is a software that is capable of doing what you want, as is Aqwa. However to get any meaningful results will take some hard work. Just to get the model to run and converge properly should be somewhat a challange if you don't have reasonable experience in the field. I would expect a lot of error messages before anything actually works!

    Is this a student task or a actual job task?

  4. tspeer
    Joined: Feb 2002
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    tspeer Senior Member

    Could you generate a linear model for the tug and another one for the barge, and then connect them with a spring to represent the tow line?

    If Ansys can generate the models, you could do the coupled analysis in Matlab/Simulink. Matlab would also be useful for evaluating or designing the control laws on the tug.
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