航空发动机转子系统模拟支承设计与刚度计算

Rotor Support Simulation Design and Equivalent Stiffness Computation for Aero-engine

为了进行实际航空发动机转子系统组装状态下的模态试验,模拟实际航空发动机转子支承刚度,设计了转子支承结构,在CATIA软件中建立了支承的三维实体模型,将三维模型导入ANSYS Workbench中,采用自动生成网格,考虑到不同的网格划分大小对结果的影响,对支承的不同结构划分了不同大小的网格。为了精确计算支承刚度,对轴承座采用空心轴内表面上加面力、空心轴外表面上加轴承载荷、轴承外圈内表面上加轴承载荷三种施加载荷方式,并进行了计算结果比较,结果表明,支承设计满足了实际航空发动机的转子支承刚度需求,转子支承刚度的计算方法正确可靠。

In order to carry out the modal testing of the actual aero- engine rotor system in assembly state and simulate the stiffness of the actual aeroengine rotor support, in this paper, we design the rotor support structure, a threedimensional solid model that simulates the rotor support is created by CATIA software, then is imported into the ANSYS Workbench software, the FE model is meshed by automatic grid generation technique, considering the effect of different mesh size on the results, the different parts of the support are divided into different size. In order to calculate the stiffness accurately, the load is acted on the bearing pedestal through three methods：surface force on the inner surface of the hollow axis;bearing load on the outer surface of the hollow axis ; bearing load on the inner surface of the outer ring of the bearing. Finally the calculated results of three methods are compared and the results show that this rotor support meet the stiffness requirements of the actual aeroengine rotor support, the methods of the stiffness calculation of the rotor support is correct and effective.