带摩擦阻尼叶片与轮盘耦合系统的振动分析

本文用非比例粘性阻尼等效航空发动机叶／盘耦合系统振动时叶片上凸肩（冠）接触面间产生的摩擦阻尼效应对叶／盘系统固有振动特性及响应特性的影响。利用由滞后弹簧摩擦模型所得到的等效粘性阻尼及等效刚度系数，在局部坐标下建立接触面间的刚度及阻尼矩阵，以分析阻尼对叶／盘系统的减振效应。文中所建立的基本公式、分析方法、由计算所导出的无因次曲线及振型与振动应力分布的后处理云图，可供叶轮机的设计、研制、排故及改型参考。

VIBRATION ANALYSIS OF BLADED DISC COUPLING SYSTEM WITH FRICTION DAMPING

Nonproportional viscous damping is used to simulate the effect of frictional constraint at the shroud interfaces.The effects on the natural vibration behavior and dynamic response are investigated.The damping matrix and stiffness matrix of the interfaces in local coordinate system are presented by using the equivalent viscous damping and stiffness coefficients of the spring/friction model.The response displacements and the corresponding response stress distributions of the coupling system under three kinds of boundary conditions at shroud contact interfaces are obtained respectively by using mode superposition method.The calculation method,the basic analysis approach and the important conclusions provided in the paper may be available for reference in the designing,development and modification of turbomachinery.