航空发动机附件齿轮行波共振噪声测量与分析  

Noise measurement and analysis on the travelling wave resonance of aero-engine accessory gears

作　　者：何刘海 吴桂娇 王平 武昌耀 HE Liuhai;WU Guijiao;WANG Ping;WU Changyao(AECC Key Laboratory of Aero-engine Vibration Technology,AECC Aviation Powerplant Research Institute,Zhuzhou 412002,China)

机构地区：[1]中国航发湖南动力机械研究所中国航空发动机集团航空发动机振动技术重点实验室

出　　处：《振动与冲击》2019年第22期210-215,共6页Journal of Vibration and Shock

摘　　要：航空发动机附件齿轮由于行波共振会引起成块断裂的破坏。针对航空发动机转速高、测量环境复杂、信噪比低等特点,为了准确测量行波共振转速,设计合适的声波导管,将齿轮产生的机械噪声以平面波的形式从附件机匣内部传递出来,布置声传感器测量齿轮噪声,并对声信号进行时频分析,获得齿轮的行波共振转速、频率及激励源。其结果与有限元计算结果相比最大误差为3.75%,验证了该结果的准确性。对比分析了齿轮在不同边界条件下的行波共振转速,结果显示边界条件对高阶行波频率影响较小,为航空发动机齿轮设计和故障诊断提供了简单、有效的手段。Aero-engine accessory gears could be damaged in the form of block fracture due to traveling-wave resonance.Considering the features of high speed,complicated measuring environment and low SNR,a measurement method for traveling-wave resonance was proposed.Acoustic sensors were placed to measure the mechanical noise of accessory gears exported from the inside of an accessory gearbox in the form of plane wave by using an acoustic catheter.Then the time-frequency analysis of signals was carried out to achieve the traveling wave resonance speed,its frequency and the excitation source of gears.The maximum error is 3.75%,compared with the result of the finite element calculation,which verifies the accuracy of the method.The experimental results of gears under different boundary conditions were compared.The results show that the boundary conditions have little effect on the high-order traveling wave frequency.The study provides a simple and effective means for the aero-engine gear design and troubleshooting.

关 键 词：航空发动机 附件齿轮 行波共振 声波导管 

分 类 号：V233.19[航空宇航科学与技术—航空宇航推进理论与工程] O422.2[理学—声学]