基于Stewart并联机构的直驱式波能转换器能量转换性能研究

Study on energy conversion performance of direct-driven wave energy converter based on Stewart parallel mechanism

为实现对不同方向海洋来流波浪能量的高效俘获,设计了一种基于Stewart并联机构的直接驱动式波浪能量转换器,该转换器的支链单元采用弹簧连接永磁体动子,通过与定子线圈的相对运动实现波浪能与电能的转换。在特定海域波浪环境下对该波能转换器进行动力学分析,并基于弗汝德-克雷洛夫假定法计算了转换器所承受的水平和垂直波浪力;采用ADAMS动力学仿真分析软件对该波能转换器进行动力学建模与能量转换仿真分析,研究了波浪力作用下其弹性支链的变形规律,并分析了支链弹簧刚度系数与动平台质量之比对转换器能量转换率的影响。研究结果表明:在波浪激励下,该波能转换器能够俘获由垂向和横向波浪运动产生的能量;通过优化调整支链弹簧刚度系数与动平台质量的比值,该波能转换器的最大能量转换率可达35.2%。研究结果可为新型高效波能发电装置的设计提供重要的理论依据。

In order to absorb the wave energy from different directions, a direct-driven wave energy converter based on Stewart parallel mechanism was designed. The branch unit of the converter was connected with permanent magnet actuator by spring element, and the wave energy-electric energy was directly converted by relative motion of stator coil. The dynamics analysis of the wave energy converter was carried out under a wave environment in a specific sea area. The horizontal and vertical wave forces acting on the converter were calculated by the F-K hypothesis method. The dynamics modelling and energy conversion simulation analysis of the converter were carried out by using ADAMS dynamics simulation analysis software. The deformation law of the elastic branched chain under the wave force was studied, and the influence of the ratio of stiffness coefficient of branched spring to mass of moving platform on energy conversion rate was analyzed. The results showed that under wave excitation, the energy generated by vertical and transverse wave motions could be absorbed by the wave energy converter. By adjusting the ratio of the spring stiffness coefficient to the mass of the moving platform,the maximum energy conversion rate of the converter device reached about 35.2%. The research results provides an important theoretical foundation for the design of new type of high-efficiency wave power generation device.