高转速大长径比传动杆动态特性研究

大客发动机径向传动杆具有长径比大、转速高等特点.为保证传动杆可靠工作,需进行精确的动态特性分析,而边界条件的选取和简化是保证传动杆动态特性准确性的关键.分别使用了简化模型和整体模型计算了传动杆的模态,通过边界条件的选取设置,对传动杆进行了动态特性分析和试验验证,并与试验结果进行了对比.结果显示,使用整体模型计算得到的传动杆模态振型与试验结果较为一致,证明了传动杆边界条件选取方法的正确性.

Dynamic Characteristics Study on Transmission Rod with High Speed and Large Aspect Ratio

The radial drive shaft of commercial aeroengine has the characteristics of large draw ratio and high rotate speed. In order to ensure its reliability, it is necessary to accurately process a dynamic characteristic analysis, in which the boundary conditions make huge sense. Simplified and integrated models were respectively used to analyze the mode of radial drive shaft. By setting the boundary conditions, the dynamic characteristics analysis was processed and the models were verified. The results of comparison show that the modal vibration shape calculated by integrated model is more consistent with the experimental, which demonstrates the correctness of boundary conditions choosing method.