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A control strategy for a duck model

An optimal (complex conjugate) control strategy has been simulated for a 0.1 m diameter duck model. Experimental conditions are such at the model operates at very low Keulegan Carpenter numbers. The experimental results agree well with predictions based on experimentally derived coefficients. The power absorbed by the duck is inferred from the incident, reflected and transmitted wave amplitudes, and from the device forces and velocities. The power extracted from the waves appears to be approximately 15% greater than the power absorbed by the device. Evidence suggests that the missing power results from very small errors in the relative phases of force and velocity, from bearing losses in the pitch axis and from viscous losses at the model water interface which are several times larger than those predicted by Stokes-Wang approximations.

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Paul NEBEL
Record Number: 11026 / Last updated on: 1995-01-09
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Collaboration sought: Information exchange/Training
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