热流环境下薄壁结构随机振动响应计算与疲劳分析

沙云东; 艾思泽; 张家铭

doi:10.13224/j.cnki.jasp.2020.07.008

热流环境下薄壁结构随机振动响应计算与疲劳分析

doi: 10.13224/j.cnki.jasp.2020.07.008

基金项目: 辽宁省“兴辽英才计划”项目(XLYC1802086); 共用技术(G-ZB0022017)

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出版历程
- 收稿日期: 2019-12-03
- 刊出日期: 2020-07-28

Random vibration response calculation and fatigue analysis of thin-walled structures under heat flux environment,

Key Laboratory of Advanced Measurement and Test Technique for Aviation,Propulsion System,Liaoning Province,School of Aero-engine,Shenyang Aerospace University,Shenyang 110136,China

摘要

摘要: 针对高速热流环境下薄壁结构随机振动应力响应变化规律与疲劳失效问题,进行了数值仿真计算与高温随机振动试验。通过对比仿真计算结果与试验结果发现模态误差小于28%,应力响应误差小于4%。结构疲劳失效时间误差小于3 430 s,验证了此仿真方法的可用性与准确性。使用该数值仿真方法,基于耦合的FEM/BEM（有限元/边界元）理论,通过Fluent软件模拟高速热流环境,实现了高速热流环境下薄壁结构随机振动应力响应的计算。获取了薄壁结构在不同振动量级与热流环境影响下动力学响应与疲劳失效时间。分析不同环境温度各流速下结构热随机振动应力响应及疲劳失效时间变化规律,并阐述造成这种变化的原因。完成的工作可对高速热流环境下薄壁结构热随机振动疲劳失效时间预估提供参考依据。
- 热流环境 /
- 薄壁结构 /
- 随机振动 /
- 疲劳失效 /
- 试验验证
Abstract: For the problem of random vibration stress response variation law and fatigue failure time of thin-walled structures under high-speed heat flux environment, numerical simulation calculations and high temperature random vibration tests were carried out. By comparing the simulation results with the experimental results, the modal error was less than 28% and the stress response error was less than 4%. The structural fatigue failure time error was less than 3 430 s, verifying the reliability of the numerical simulation. Based on the coupled FEM/BEM（finite element method/boundary element method） theoretical, the Fluent software was used to simulate the high-speed heat flux environment, and the calculation of the random vibration stress response of the thin-walled structure under high-speed heat flux environment was realized. The dynamics response and fatigue failure time of thin-walled structures under different vibration magnitudes and heat flux environments were obtained. The variation law of structural thermal random vibration stress response and fatigue failure time under different environment temperatures and flux rates was analyzed, and the reasons for these changes were explained. The work completed can provide a reference for the estimation of thermal random vibration fatigue failure time of thin-walled structures under high-speed heat flux environment.
- heat flux environment /
- thin-walled structure /
- random vibration /
- ,fatigue failure /
- experimental verification

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