螺旋桨桨毂疲劳试验加载方法

为解决螺旋桨桨毂疲劳试验中气动载荷、离心载荷的干涉问题,基于对桨毂所受载荷及其可测试性的分析,设计了加载方法.灵活运用全桥电路试验原理,通过载荷的动、静态标定等流程环节,形成以控制应变输出为基础的加载方法.对载荷标定过程中非标定载荷与标定载荷的相关性及其引起的加载误差进行了分析,采用应变线性叠加法减小了两种载荷的相互影响,从而实现气动载荷和离心载荷的准确施加,加载系统的误差在5%以内. 

Loading method on fatigue test of propeller hub

To resolve the problem of interference between aerodynamic load and centrifugal load in fatigue test of propeller hub, a loading method was designed based on the analysis of load on the propeller hub and its testability. Using the test principle of full bridge circuit flexibly, the loading method was formed on the basis of strain output control with the processes of static and dynamic calibration. Besides, the correlation between the calibration load and non-calibration load during the processes of load calibration and the loading error resulted from the correlation were analyzed. The interference between these two loads was reduced by means of strain linear superposition. Thus aerodynamic load and centrifugal load are applied accurately with the error of the loading system less than 5%.