Point absorber wave energy converter is one of the most effective wave energy harness devices. Most of the wave energy converters generate energy by oscillating the floating body. Usually, the power-take-off system is simplified as a linear spring and a linear damper. However, the narrow frequency bandwidth around a particular resonant frequency is not suitable for real vibrations applications. Thus, a nonlinear hardening spring and a linear damper are applied in the power-take-off system. The bandwidth of hardening mechanism is discussed. The dynamic model of wave energy converter is built in regular waves with time domain method. The results show that the nonlinear wave energy converter has higher conversion efficiency than the linear wave energy converter more than the natural frequency state. The conversion efficiency of the nonlinear wave energy converter in the low frequency state is closed to the linear converter. The amplitude of the incident wave, the damping of the nonlinear wave energy converter and the nonlinear parameter α affect the energy capture performance of the wave energy converter.

中文翻译：

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具有非线性硬化弹簧动力输出系统的规则波点吸收波能转换器

点吸收波能转换器是最有效的波浪能线束装置之一。大多数波浪能转换器通过振荡浮体来产生能量。通常，取力器系统被简化为线性弹簧和线性阻尼器。然而，特定谐振频率附近的窄频带宽不适用于实际振动应用。因此，在动力输出系统中应用了非线性硬化弹簧和线性阻尼器。讨论了硬化机制的带宽。波浪能转换器的动力学模型是用时域方法在规则波中建立的。结果表明，非线性波换能器比线性波换能器在固有频率状态下具有更高的转换效率。非线性波能量转换器在低频状态下的转换效率接近线性转换器。入射波的振幅、非线性波浪能转换器的阻尼和非线性参数α影响波浪能转换器的能量捕获性能。