基于非线性摆杆刚度机构的点吸式波能转换器

Point-Absorbing Wave Energy Converter Based on Nonlinear Pendulum Stiffness Mechanism

为了稳定捕获海洋低频波能,设计了一种基于非线性摆杆刚度机构的点吸式波能转换器.通过在摆杆间添加简单的拉伸弹性元件,制作了紧凑的摆杆刚度装置.对非线性刚度结构进行了受力分析,结合Cummins方程,建立了非线性波能转换器的时域动力学模型,并分析了规则波作用下点吸式波能转换器的波能转换特性.数值仿真结果表明,引入合适的非线性摆杆刚度机构可以提升系统在波浪激励下的运动响应,降低系统在波浪激励下运动响应峰值对应的频率,从而提高系统对于低频能量的捕获效率.

In order to achieve stable capture of ocean low-frequency wave energy,a point-absorbing wave energy converter based on a nonlinear pendulum stiffness mechanism was designed.A compact pendulum stiffening device was constructed through addition of simple tensile elastic elements between the pendulums.The force analysis of the nonlinear stiffness structure was carried out the time domain dynamic model of the nonlinear wave energy converter was established based on the Cummins equation,and the wave energy conversion characteristics of the point absorption wave energy converter under the action of regular waves were analyzed.Numerical simulation shows that through introduction of an appropriate nonlinear pendulum stiffness mechanism,the motion response of the system under wave excitation can be improved,and the frequency corresponding to the peak motion response of the system under wave excitation can be reduced,thereby improving the system's capture efficiency of low-frequency energy.