失谐螺栓连接对薄壁圆筒的动力特性影响  

Influence of mistuning bolted joints on dynamic characteristics of thin-walled cylinder

作　　者：姚星宇 YAO Xingyu(Aviation Engineer Institute,Civil Aviation Flight University of China,Guanghan 618307,China)

机构地区：[1]中国民用航空飞行学院航空工程学院,广汉618307

出　　处：《北京航空航天大学学报》2023年第5期1238-1246,共9页Journal of Beijing University of Aeronautics and Astronautics

基　　金：中国民用航空飞行学院重点项目(ZJ2019-05);中国民用航空飞行学院面上项目(BJ2016-03)。

摘　　要：螺栓连接结构的性能退化是航空发动机安全运行必须考虑的问题,螺栓连接预紧失谐这个概念可以表征螺栓连接结构的性能退化,并用预紧失谐量和预紧失谐比例说明预紧失谐的状态。在此基础上,将预紧失谐的概念与螺栓连接改进薄层单元法相结合,研究失谐螺栓连接对薄壁圆筒动力特性的影响。针对预紧失谐对薄壁圆筒的确定性动力特性进行分析,包括固有特性、稳态响应的影响,考虑螺栓预紧力的随机性,研究失谐螺栓连接对薄壁圆筒的概率性动力特性分析。研究结果表明:薄壁圆筒同阶固有频率的分离程度随着预紧失谐量的减小而增大,随着预紧失谐比例的增大呈现“双峰”特点;预紧失谐使得薄壁圆筒响应峰值对应的频率减小但幅值增大,随机预紧失谐使得响应峰值点的频带更宽,并且输入参数为指数分布时,输出参数为威布尔分布。The performance degradation of bolted joints is a problem which should be considered for the safety of aero-engine.The concept of preload mistuning of bolted joints can characterize the performance degradation,and the preload mistuning amplitude and the preload mistuning ratio are used to illustrate the state of the preload mistuning.The influence of mistuning bolted joints on the dynamic characteristics of thin-walled cylinder was studied based on the combination of preload mistuning with the improved thin-layer element method of bolted joints.First of all,the deterministic analysis of the influence of preload mistuning on the thin-walled cylinder was proposed,including the influence of the natural frequency and steady-state response.Moreover,the influence of preload mistuning on the probabilistic response characteristics of thin-walled cylinder was researched considering the randomness of bolt preload.The results indicate that the separation degree of the same-order natural frequency of thin-walled cylinder increases with the decrease of preload mistuning amplitude,and presents a“double peak”characteristic with the increase of preload mistuning ratio.The preload mistuning makes the frequency corresponding to the response peak of thin-walled cylinder reduce but the amplitude increase.The random preload mistuning makes the frequency band of the response peak point wider,and when the input parameter is exponential distribution,the output parameter is Weibull distribution.

关 键 词：螺栓连接 改进薄层单元法 预紧失谐量 预紧失谐比例 薄壁圆筒 概率分析 

分 类 号：V232.7[航空宇航科学与技术—航空宇航推进理论与工程]