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提出一种新型点吸收式波浪能装置,该装置采用弹簧回复液压缸作为二级能量转换机构,在波浪作用下装置垂荡做功。对装置受力分析后建立质量-弹簧-阻尼数学模型,运用基于简单格林函数的边界元方法进行水动力学分析和计算,求出波浪激励力和水动力学系数。重点优化外部弹簧系数和外部阻尼系数这两个关键参数;分析与优化是基于外部阻尼力随位移正弦变化的假定,而在实际系统中液压缸排油的背压基本不变,因此用等效阻尼力的概念来对应处理真实装置的外部阻尼力。最后根据完整的理论分析和优化设计结果举例计算。全文完整地给出处理该类问题的方法,优化的结果可有效指导实际装置的设计工作。
A new point-absorbing wave energy device is proposed. The device uses a spring-return hydraulic cylinder as a secondary energy conversion mechanism, and the device works under the action of waves. After the force analysis of the device, the mass-spring-damping mathematical model is established. The hydrodynamic analysis and calculation are carried out by the boundary element method based on the simple Green’s function. The wave excitation force and hydrodynamic coefficient are obtained. The two key parameters of external spring coefficient and external damping coefficient are optimized. The analysis and optimization are based on the assumption that the external damping force varies sinusoidally with displacement. In the actual system, the backpressure of the cylinder oil discharge is basically unchanged. Therefore, The concept of damping force corresponds to the external damping force of a real device. Finally, based on a complete theoretical analysis and optimization of design results for example. The full text gives a complete solution to this problem, and the optimized result can effectively guide the design of the actual device.