摘要
为了研究涡轮转子叶片在高温环境中气流激振力作用下随机振动疲劳失效机理,从基础研究出发,采用薄壁板件为研究对象。基于高温试验台与振动台联合试验,结合数值仿真,得到了不同温度和不同振动量级组合下试验件根部与颈部的轴向动应力响应规律。基于疲劳累积损伤理论,采用改进的雨流计数法预估试验件的疲劳寿命。通过高温随机振动试验,同时参照常温随机振动试验,获得试验件在实际工况下的应力、应变、频率等动力学响应和寿命数据,并对各个试验组的响应与寿命进行数据统计,仿真与试验结果比较发现:数值仿真对试验件破坏位置判断准确,应力响应误差在5.6%以内,频率响应相差1%左右,疲劳寿命相差28.6%以内,证明了高温条件下随机振动疲劳分析方法是有效的而且精确的。
In order to study the random vibration fatigue failure mechanism of turbo-rotor blades under the excitation of high-temperature airflow,as a basic research on this question,thin-walled plates were adopted as simulation and experimental objects.By high-temperature test chamber and shaking table tests,the axial dynamic stress responses of test pieces were obtained under different temperature and vibration level.Based on the theory of Miner linear fatigue accumulative damage,an improved rain flow counting method was used to estimate the fatigue life of thin-walled structures.Using an integrated test bench composed of a high-temperature test bench and a shaking table,the stress and life data of the test pieces under actual working conditions were obtained,and the simulation and experimental results were compared.The results show that by simulation the failure position of the test pieces can be detected accurately,the stress response error is less than 5.6%,the maximum error of the frequency responses is about 1% and the fatigue life is less than 28.6%,which proves that the analysis method for the random vibration fatigue estimation in high temperature condition is effective and accurate.
作者
沙云东
朱付磊
赵奉同
张墨涵
SHA Yundong;ZHU Fulei;ZHAO Fengtong;ZHANG Mohan(Liaoning Province Key Laboratory of Advanced Measurement and Test Technology of Aviation Propulsion Systems,Shenyang Aerospace University,Shenyang 110136,China;School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第2期64-71,85,共9页
Journal of Vibration and Shock
基金
航空基础科学基金(20151554002)
关键词
薄壁板
高温条件
随机振动
疲劳寿命
试验验证
thin plate
high temperature condition
random vibration
fatigue life
experimental verification
作者简介
第一作者:沙云东,男,博士,教授,1966年生;通信作者:汤文辉,男,博士,教授。