含支承松动故障的航空发动机非同步响应特征  

Characteristics of Aero-engine Asynchronous Response with Support Looseness Fault

作　　者：王海飞[1] 陈果[1] 廖仲坤 张璋[2] 邵伏勇 

机构地区：[1]南京航空航天大学民航学院,南京210016 [2]中国航天科工飞航技术研究院北京动力机械研究所,北京100074

出　　处：《振动．测试与诊断》2016年第5期858-864,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家安全重大基础研究资助项目(613139);江苏省研究生培养创新工程资助项目(KYLX_0295);中央高校基本科研业务费专项资金资助项目

摘　　要：针对航空发动机支承系统中普遍存在的松动故障,为研究松动故障导致的非同步响应特征产生的机理,建立了发动机的转子-支承-机匣整机模型,引入支承松动故障模型,利用数值积分方法求解耦合系统的响应,分析了非同步响应特征。结果表明,对于航空发动机中的支承松动故障,其引发的分频以及倍频原因在于,当刚度变化的周期等于转速周期时,将产生转频的倍频现象,在特定转速下,将激发系统的临界转速对应的频率;当刚度变化的周期等于n倍的转速周期时,则将产生1/n转频的分频及其倍频,在特定转速下,将激发系统的临界转速对应的频率。This paper examines the mechanism of asynchronous response characteristics caused by looseness faults in aero-engine support systems. First, a single-degree-of-freedom rotor model without mass was established, and a looseness fault model was introduced. The response of the system was obtained by the numerical integration method, and the asynchronous response characteristics were analyzed. Second, an entire engine rotor-bearing-casing model was established, and a looseness fault model was introduced. The coupled system response was solved with the numerical integration method, and its asynchronous response characteristics were analyzed. The results showed the reasons that support looseness faults in aero-engines caused frequency division and frequency multiplication: When the changing period of stiffness was equal to that of the rotation speed, frequency multiplication appeared, and the corresponding frequencies of critical speeds were excited at certain speeds. Moreover, when the changing period of stiffness was integer times that of the rotation speed, 1/n times frequency division and frequency multiplication appeared, and the corresponding frequencies of critical speeds were excited at certain speeds. © 2016, Editorial Department of JVMD. All right reserved.

关 键 词：非同步响应特征 动力学建模 松动故障 整机振动 松动机理 

分 类 号：TH113.1[机械工程—机械设计及理论]