风扇转子动特性试验与分析

转子不平衡是引起发动机振动的主要原因。针对风扇转子工艺状态平衡良好,但工作状态不平衡量较大所引起振动偏大的现象,对其变化规律及影响因素开展转子动特性试验。采用卧式转子试验器测量风扇转子在工作转速范围内各截面的振动响应,利用三圆法测算出转子动不平衡量在高、低转速间存在的明显差异,主要是套齿连接结构刚度变化及叶片工作状态差异引起。通过窄带跟踪滤波提取出转子在各典型转速下基波弹性线,发现风扇转子本身未发生较大挠曲变形,为准刚体状态。其相位测试结果表明:风扇转子与多功能轴间存在明显的非同步振动规律。

Test and Analysis of Dynamic Characteristic of Fan Rotor

Unbalanced rotor was the main cause of engine vibration. In view of the phenomenon that the process state of the fan rotor was well balanced,but the vibration caused by the large amount of unbalanced working state was large,the dynamic characteristic test of the rotor was carried out for the variation law and influencing factors. A horizontal rotor tester was used to measure the vibration response of each section of the fan rotor in the working speed range. The three circles method was calculated by obvious difference between the rotor dynamic unbalance values at high and low rotational speed,which was mainly caused by the change of the structural stiffness of the socket connection and the difference of the blade working state. The fundamental elastic line of rotor at each typical rotational speed was extracted by narrow-band tracking filter. It was found that no large flexure deformation occur in the fan rotor itself,the fan rotor was quasi-rigid state.The phase test results show that there is obvious non-synchronous vibration law between the fan rotor and the multi-function shaft.