Abstract
This paper presents a novel two-body counter-rotating wave energy converter (CR-WEC) designed to power deep-sea exploration equipment. In contrast to conventional two-body structures, which employ relative motion, the CR-WEC powers the Power Take-Off (PTO) via absolute motion to circumvent the issue of a limited working stroke. We present the power equation of CR-WEC in the frequency domain, based on the actuator disk model from the wind turbine field, in order to elucidate the energy absorption characteristics of this type of two-body absorber and investigate the influence of parameters on power acquisition. Experiments conducted as part of this study have confirmed this theory's applicability to the CR-WEC. Through an approximation, we derive the frequency point corresponding to the maximum value of the equation, which we refer to as the Power Maximum Frequency Point (PM-FP) in this paper. Under the external excitation of both regular and irregular waves, we investigate how parameter modification can enhance the absorber's capture characteristics in specific cases. After modifying the parameters according to the principles derived from the aforementioned research, the system's theoretical power output can more than double. In addition, this study's conclusions emphasize the benefits of CR-WEC with cascade expansion. By connecting multiple PTOs in series, power generation can be enhanced.
Published Version
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