水平轴风力机柔性叶片多体动力学建模与动力特性分析  

Multibody dynamic modeling and dynamic characteristics analysis of flexible blades for a horizontal axis wind turbine

作　　者：莫文威 李德源[1] 夏鸿建[1] 吕文阁[1] 

机构地区：[1]广东工业大学机电工程学院,广州510006

出　　处：《振动与冲击》2013年第22期99-105,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51276043)资助

摘　　要：为用较少自由度实现水平轴风力机柔性叶片气弹耦合分析,用超级单元(Superelement)方法将柔性叶片离散为由带有力元弹簧及阻尼器的旋转铰连接的有限个数体,基于多体动力学理论,应用R-W(Roberson-Wittenburg)方法导出叶片多体系统动力学微分-代数方程组;研究方程组数值积分方法及通过脉冲响应谱实现系统动力特性分析方法;分析某1.5 MW风力机叶片在脉冲载荷作用下的动力响应与固有频率,并通过与ANSYS、ADAMS结果对比验证方法及编制程序的有效性与正确性。结果表明,超级单元法能用较少自由度准确描述柔性叶片弹性变形与动力载荷与叶片位移间耦合,为风力机气动弹性耦合及稳定性分析提供实用分析方法。In order to realize the aeroelastic coupling analysis of flexible blades of a horizontal axis wind turbine with fewer DOF, a so-called superelement approach was used to approximate a flexible blade into a series of rigid bodies connected with springs and dampers. A set of dynamic differential-algebraical equations of the blade multibody system was deduced with R-W method based on the theory of computational dynamics of multibody system. The numerical integration methods for solving the set of equations and the analysis method for dynamic characteristics of the system with the impulse response spectrum were presented here. The dynamic response and natural frequencies of a 1.5 MW wind turbine blade were analyzed and the results were compared with those calculated with ANSYS and ADAMS. The results verified the effectiveness and correctness of the modeling method and the computing program. The results showed that the superelement modeling method can describe the elastic deformation of a blade and the coupling between dynamic loads and blade elastic deformation well, and the proposed method is feasible for the aeroelastic coupling and stability analysis of a wind turbine system.

关 键 词：风力机 柔性叶片 多体系统 超级单元 动力特性 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]