WECCCOMP – Forums › WECCCOMP forum › Constraints on position and viscous force consideration in simulation evaluation

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  • 28th February 2018 at 2:32 pm #1347
    Hull University
    Competitor

      Please we have two question
      1. In the evaluation criteria we would like to know the value of z_max (the displacement constraint on the PTO (in m)). Is there a specific value that should be consider?
      2. In the provided Simulink WECCC model the nonlinear effects, such as viscous force, are not considered. Please, should we consider this in this first stage (simulation)?

      Thanks a lot
      Mustafa Abdelrahman
      Hull University team

      1st March 2018 at 10:16 pm #1349
      Tom Nathan
      Organiser

        Hull University,

        Thank you for your questions. The WECCCOMP organizers’ responses are below:

        1. The value for Z_{max} is 0.06 m (6 cm), please use this value for calculating the evaluation
        criteria.
        2. A validation study was completed that included a linear rotational damping term to tune the
        WEC-Sim model to match experimental measurements of the Wavestar. The
        wecSimInputFile.m was modified to include a body(1).linearDamping term that was
        determined from experimental tests. This term includes the combination of bearing friction
        and fluid viscous damping. Please pull the latest version of WECCCOMP from the Github
        repository.

        Thank you again for your questions, if you need additional clarification, please post to the forum and the organizers will respond as quickly as possible.

        Cheers,
        Nathan Tom
        National Renewable Energy Laboratory

        14th March 2018 at 12:32 am #1353
        Hull University
        Competitor

          Thanks very much Nathan

          14th March 2018 at 8:22 pm #1365
          Tom Nathan
          Organiser

            Hull University,

            After some discussion between the WECCCOMP organizers, we have decided to increase the maximum allowable motor linear displacement.

            1. The value for Z_{max} is now 0.08 m (8 cm), please use this value for calculating the evaluation
            criteria.

            Apologies for any confusion this has caused. If you require additional clarification, please post to the forum and the organizers will respond as quickly as possible.

            Cheers,
            Nathan Tom
            National Renewable Energy Laboratory

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