卡箍刚度的有限元计算与实验测定

FINITE ELEMENT ANALYSIS AND EXPERIMENTAL MEASUREMENT OF STIFFNESS OF HOOP

准确确定卡箍刚度对管路系统的振动特性分析具有重要意义。本文针对航空发动机管路系统中不同卡箍的结构特点，建立了计算卡箍刚度的有限元模型。对单管接地卡箍及双管悬地卡箍的刚度系数进行了有限元计算，还对一典型双管悬地卡箍刚度进行了实验测定。通过卡箍刚度计算结果与实验结果的对比表明，本文建立的卡箍刚度计算方法可用于管路系统振动特性分析工程实际之中。

It is important to determine the stiffness coefficients of the hoops precisely for the vibration analysis of a pipeline system.For this purpose the finite element models for calculating the stiffness coefficients of the hoops are established in accordance with the structural features of the various hoops used in aeroengine pipeline systems.The stiffness coefficients of a grounded hoop for single pipe and a hung hoop for double pipes are obtained by the finite element analysis.In addition,the stiffness coefficients of a typical hung hoop for double pipes are measured by using the established experimental method.The comparison between the calculational and experimental results of the hoop shows that the provided method is feasible in the engineering practice of vibration analysis for a pipe line system.