风电齿轮箱固有特性分析及工作模态测试

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The drive and structure system coupled dynamics model of wind turbine gearbox was built using finite element method, in which four spring elements was used to simulate each bearing connection. The inherent characteristics of the gearbox under practical constraint were analyzed to get its first 20 modal frequencies and modal shapes. Meanwhile a test was also carried out to obtain the gearbox＇s modal parameters in 5 different conditions using operational modal identification technique based on response data. The results of test and finite element analysis were consistent by comparison. It indicated that the coupled dynamics model was correct, so the model could be used to analyze gearbox in- stead of physical model.采用有限元的方法建立了风电齿轮箱传动系统与结构系统的耦合动力学模型。在轴承连接处采用4个弹簧单元进行模拟，分析了齿轮箱在实际约束条件下的固有特性，得到了其前20阶模态频率与振型。同时对齿轮箱进行了实验，采用基于响应数据的工作模态辨识技术，得到其在5种不同工况下的模态参数，并把得到的参数和有限元的分析结果进行对比，两者的结果基本吻合。结果表明建立的耦合动力学模型是正确的，可以用它来替代实物模型对齿轮箱进行分析。