航空发动机外部管路振动模态试验研究  

Research on Vibration Modal Experiments of Aero-engine External Pipes

作　　者：黄燕晓[1] 王轩[2] 苗万青 Huang Yanxiao;Wang Xuang;Miao Wanqing(School of Vocation Technology,Civil Aviation University of China,Tianjin 300300,China;School of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学职业技术学院,天津300300 [2]中国民航大学航空工程学院,天津300300

出　　处：《机械科学与技术》2019年第1期156-164,共9页Mechanical Science and Technology for Aerospace Engineering

基　　金：中央高校基本科研业务费项目中国民航大学专项项目(3122017108)资助

摘　　要：为分析不平衡振动对航空发动机外部管路结构影响,构建管路的真实与简化模型,通过双应变片传感器测试管路振动模态试验方法研究两端固支长薄壁管路的振动特征,并对管路模型有限元仿真计算比较。结果表明:简化与真实模型的试验结果基本一致;两种模型主振型均为1弯、2弯、3弯;两种模型固有频率除第1阶管路两端不能完全固支约束差异大外,后2阶在10%误差内;试验结果与仿真结果保持一致。振动模态试验方法对材料参数不全构件振动特征分析,助于管路结构优化与特征精确预测。To analyze the influence of unbalanced vibration on aero-engine external pipes,based on the construction of a real pipe model and a simplified model,the paper probed into the vibration characteristics of the long thin-walled pipes fixed at both ends of the engine with the pipe vibration modal experiment method.And a comparison was made between the experimental result and that obtained through the finite element simulation analysis of the pipe model.It proved that the results obtained from the simplified model and the real model were basically the same;the main vibration types were single bending,double bending and triple bending;the inherent frequency differences of the two models accounted for no more than10%,except that the differences among the first order were considerable because of its adjacency to both ends of the pipe;the experimental results were in line with the simulation ones.The paper concludes that the vibration modal experiment method can be used in the analysis of the vibration characteristic of the components with incomplete material parameters,which will be helpful for the optimization of the pipe structure and actual prediction of its vibration characteristics.

关 键 词：航空发动机 振动 模态分析 试验 固有频率 结构优化 外部管路 

分 类 号：V233[航空宇航科学与技术—航空宇航推进理论与工程]