典型舱段结构三轴振动/热复合环境虚拟试验方法研究  

Virtual test method for triaxial thermal-vibration composite environment of typical cabin section structure

作　　者：丁镇军[1] 欧阳钦山 刘飞星 董龙雷[2] 魏龙 任方[1,3] DING Zhenjun;OUYANG Qinshan;LIU Feixing;DONG Longlei;WEI Long;REN Fang(Beijing Institute of Intensity and Environment,Beijing 100076,China;State Key Lab for Strength and Vibration of Mechanical Structures,Xi’an Jiaotong University,Xi’an 710049,China;Science and Technology on Reliability and Environment Engineering Laboratory,Beijing Institute of Intensity and Environment,Beijing 100076,China)

机构地区：[1]北京强度环境研究所,北京100076 [2]西安交通大学复杂服役环境重大装备结构强度与寿命全国重点实验室,西安710049 [3]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《振动与冲击》2024年第23期30-37,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金联合基金项目(U20B2002)。

摘　　要：随着航天飞行器面临的力学环境愈发严酷,热与振动环境已成为造成结构损伤和破坏、产品功能下降或失效的关键因素。建立了一种考虑三轴振动与热复合环境的虚拟试验方法,以简化的筒形舱段为对象,分别建立石英灯阵高温加热仿真模型与三轴振动仿真模型,并通过实际试验数据得到振动台-夹具传递函数,将三者结合以建立三轴虚拟热振仿真模型。分别通过舱段结构单轴热振试验与三轴热振试验来验证所建模型的准确性,并基于验证后的模型获取三轴振动下结构中央测点随温度时变的传递函数变化情况。由舱段模态试验验证舱段有限元模型的准确性,对比前6阶模态频率误差不超过5%。在单轴热振试验中,仿真模型各测点响应均方根值(root mean square,RMS)与试验加速度响应RMS的误差不超过15%;在三轴向热振试验中RMS误差不超过20%,验证了所建虚拟热振模型的有效性。With increasingly harsh mechanical environment faced by spacecraft,thermal-vibration environment has become a key factor to cause structural damage and destruction as well as product functionality degradation or failure.Here,a virtual test method considering triaxial vibration-thermal composite environment was established.A simplified cylindrical cabin section was taken as the study object,and high-temperature heating simulation model of quartz lamp array and triaxial vibration simulation model were established,respectively.The shaking table-fixture transfer function was obtained with actual test data,and the three were combined to establish a triaxial virtual thermal-vibration simulation model.The correctness of the established model was verified with uniaxial and triaxial thermal-vibration tests for a cabin section structure.Based on the verified model,transfer function changes with temperature time-varying of the central measured point of the structure were obtained under triaxial vibration.The correctness of the cabin section’s finite element model was verified with the cabin section modal testing.Comparing the cabin section’s test and simulation results,it was shown that for the first 6 modes,modal frequency errors are no more than 5%;in uniaxial thermal-vibration tests,errors between acceleration response root mean square(RMS)values of various measured points obtained with the simulation model and those obtained with tests do not exceed 15%;in triaxial thermal-vibration tests,these RMS errors do not exceed 20%to verify the effectiveness of the established virtual thermal-vibration simulation model.

关 键 词：热振复合环境 虚拟试验方法 石英灯加热仿真 三轴振动 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3