The float of the oscillating-buoy wave energy converter is the core mechanism to obtain wave energy, while the size of the float's motion stroke has an important influence on the energy conversion performance of the converter. Due to limitation of the stroke, in the real sea condition operation often collide with the stroke limiting mechanism, which causes energy loss and even leads to damage of the converter, so it is necessary to install the limiting mechanism with vibration damping in order to provide a buffer, and at the same time, through the adjustment of the parameter of the damping mechanism in order to reduce the energy loss due to the collision with the limiting mechanism. This paper targets the problem of vibration characteristics of the oscillating-buoy wave energy converter with a limiting mechanism, a mathematical model of energy conversion with an end-stop system has been established, for which a time domain method to avoid the huge potential energy error due to the step change of the spring stiffness in numerical simulation has been proposed. On this basis, the effects of Power Take Off (PTO) system parameters, mass, stroke, and end-stop system parameters on the energy capture width ratio of the convertor were investigated, a parameter optimization design method for the limit mechanism is proposed. The results are instructive for further engineering studies of oscillating-buoy wave energy converter.
Key words
wave energy conversion /
end-stop system /
potential energy error /
optimal parameters
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