Research on Design Method of the Hydraulic Energy Conversion System of Inertial Wave-energy-powered Buoy

doi:10.3901/JME.2022.04.222

Abstract

Abstract: Buoys are important tools for ocean exploration, and the use of wave energy to supply power to buoys can meet their high demand on electricity. Aiming at the inertial wave-energy-power-supply buoy, the design method of its hydraulic energy conversion system is studied. The Cummins’ time-domain equation is used to establish a nonlinear discontinuous dynamic model describing the two-body system composed of the buoy and the internal inertial body. It is found that, the main factors that affect energy capture are: the pressure-volume ratio of the accumulator K_a and a coefficient K_r that synthesizes the hydraulic motor displacement, generator load resistance and generator characteristic coefficient. Under the assumption of infinitely large volume of the hydraulic accumulator, the optimal stiffness of the suspension spring is obtained. The results show that K_a does not affect the captured wave energy power and the average pressure of the accumulator but affects the fluctuation range of the accumulator pressure; the captured wave energy power is a unimodal function of K_r, and the peak value corresponds to the optimal value of K_r. The maximum K_a that enables the accumulator pressure standard deviation coefficient to reach the specified threshold is the optimal value of K_a.

Key words: buoy, wave-energy powering, hydraulic system, accumulator, design method

CLC Number:

TK79

WU Jinming, CHEN Ni, QIAN Chen. Research on Design Method of the Hydraulic Energy Conversion System of Inertial Wave-energy-powered Buoy[J]. Journal of Mechanical Engineering, 2022, 58(4): 222-231.

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