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

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  • #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

    #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

    #1353
    Hull University
    Competitor

    Thanks very much Nathan

    #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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