发动机附件机匣振动分析与故障排除方法

Vibration Analysis and Troubleshooting Method of Engine Accessory Gearbox

针对典型的发动机附件机匣振动超限情况,分析PULSE振动分析仪采集的振动信号,确定了固有频率共振是引起发动机附件机匣振动超限的主要原因。应用锤击法进行的试验证明,固有频率共振是由振动传感器、振动支架安装到发动机附件机匣上以后产生的,4轴对应的齿轮啮合频率振动激发了系统固有频率共振,使其振动超限。工程上采取两种方法降低附件机匣振动,一是在振动支架上安装辅助重物改变系统固有频率,避免产生固有频率共振;二是调整发动机附件机匣安装状态,降低基础振动水平。

The engine accessory gearbox is kinetic energy conversion device. In the test process, the vibration of accessory gearbox may monitor the working condition of gear. Aiming at the typical engine accessory gearbox vibration fault, using PULSE vibration analyzer, determined that the resonant frequency of the engine was the main cause. Application of hammering method test, verified that accelerometer mounted to the engine casing generated the system natural frequency resonance. Two methods reduce the accessory gearbox vibration level: Changing the natural frequency of the system through mounting an auxiliary weight on the bracket, avoids the generation of resonant frequency.,.