万向铰式倾转旋翼整体模态分析与试验

摘要

Based on finite element method (FEM), dynamic model of tiltrotor with universal joint hub and advanced geometry blades is established. Modes of the free-free blades and the rotor are analyzed,and modes measurement of the blades and the rotor is accomplished with LMS system by combining local coordinates with global ones. Results of mode identification in experiment are compared with calculation results. Availability and rationality are verified between experimental procedure and analytical method.The comparation shows that the established model has a great practicability and a good ability to analyze natural characteristic of tiltrotor with universal joint hub.%针对带有复杂几何外形桨叶的万向铰式倾转旋翼,利用有限元法进行动力学建模,并对根部自由桨叶以及安装在台架上的旋翼进行模态分析.利用LMS系统通过局部坐标与整体坐标相结合的方式对模型桨叶及旋翼进行模态测量,并将实验的模态识别结果与理论分析结果进行对比,相互验证了实验方法与分析方法的有效性与合理性,结果表明所建立分析模型及方法实用性强,可以有效分析万向铰式倾转旋翼的固有特性.