热流环境下薄壁连接结构随机振动响应数值计算  

Random Vibration Response Numerical Calculation of Thin-walled Connection Structures under Heat Flux Environment

作　　者：刘爽 沙云东 LIU Shuang;SHA Yundong(School of Aero-engine,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学航空发动机学院,沈阳110136

出　　处：《装备环境工程》2025年第3期53-61,共9页Equipment Environmental Engineering

基　　金：中国航发产学研合作项目(HFZL2018CXY017)。

摘　　要：目的研究薄壁连接结构在热流冲击和随机振动环境下的应力响应特性。方法基于非线性大挠度振动理论进行薄壁结构高温随机振动响应分析,同时开展热振联合试验。根据试验验证的计算分析方法及热-流-固耦合理论,开展薄壁连接结构在热流冲击环境中的随机振动响应分析。结果基频误差均小于4%,轴向应力误差均小于2.4%。结论随着温度升高,薄壁连接结构应力响应峰值向左移动,应力响应曲线趋势不发生改变。流速在100~140m/s时,对薄壁连接结构应力响应趋势的影响较小,随着流速的增大,结构应力相应数值有小幅增加。振动量级与薄壁连接结构轴向应力呈正相关,且振动量级增加,结构应力数值变化明显,在150~450℃对结构轴向应力的影响占主导地位。The work aims to investigate the stress response characteristics of thin-walled connection structures under thermal shock and random vibration environments.A high-temperature random vibration response analysis of thin-walled structures was carried out based on the nonlinear large deflection vibration theory,while combined thermal-vibration tests were conducted simultaneously.A random vibration response analysis of thin-walled connection structures in the thermal shock environment was performed based on the verified calculation and analysis method and the heat-flux-solid coupling theory.The base frequency error was less than 4%,and the axial stress error was less than 2.4%.With the increase in temperature,the peak of the stress response of the thin-walled connection structure shifts to the left,and the stress response trend remains unchanged.The flow rate within the range of 100-140 m/s has a relatively small influence on the stress response trend of the thin-walled connection structure.As the flow rate increases,the corresponding value of the structural stress increases slightly.The vibration level is positively correlated with the axial stress of the thin-walled connection structure.Moreover,as the vibration level increases,the structural stress changed significantly.The temperature range of 150-450℃ plays a dominant role in influencing the axial stress of the structure.

关 键 词：薄壁连接结构 热流固耦合 随机振动 应力分布 模态频率 试验验证 

分 类 号：V214.4[航空宇航科学与技术—航空宇航推进理论与工程]