摘要
传统的热振耦合方法缺乏对材料热特性变化的考虑,影响仿真分析的精度。为此,文章提出一种热特性参数与振动动态耦合的分析方法,建立动态变化的热振耦合方程,基于闪光瞬态法得到材料的热特性参数并将其应用在结构传热过程的数值仿真计算中。结果表明,是否考虑材料的热特性变化会对结构的传热过程仿真结果产生较大影响,并进一步影响结构的刚度特性仿真结果,从而造成结构模态分析偏差。采用本研究提出的动态变化的热振耦合模拟方法可提高传热仿真分析的精度和可靠度。
The conventional thermal-vibration coupling method lacks the consideration for the changes in the thermal characteristics of materials,which affects the accuracy of simulation analysis.Therefore,in this paper,an analysis method by dynamic coupling of thermal characteristics and vibration was proposed,and a dynamic thermal-vibration coupling equation was established.Based on the flash transient method,the thermal characteristic parameters of materials were obtained and applied in the numerical simulation of structural heat transfer process.The results show that whether or not the variation of heat transfer characteristics of materials is considered exhibits a great impact on the heat transfer process simulation results of the structure,which will further affect the simulation results of the stiffness characteristics of the structure,resulting in errors in structural modal analysis.The accuracy and reliability of heat transfer simulation analysis can be improved by the proposed dynamic thermal-vibration coupling simulation method.
作者
薛景天
董龙雷
刘振
赵建平
丁镇军
王潇屹
XUE Jingtian;DONG Longlei;LIU Zhen;ZHAO Jianping;DING Zhenjun;WANG Xiaoyi(State Key Laboratory for Strength and Vibration of Mechanical Stuctures,Xi’an Jiaotong University,Xi’an 710049,China;Beijing Institute of Structure and Environment Engineering,Beijing 100076,China;A Department of the PLA Rocket Force,Xi’an 710407,China)
出处
《航天器环境工程》
CSCD
2024年第1期43-48,共6页
Spacecraft Environment Engineering
基金
基础研究项目群(编号:xxxx10110-206)。
关键词
火箭仪器舱
热振耦合
数值仿真
闪光瞬态法
刚度变化
rocket instrument cabin
thermal-vibration coupling
numerical simulation
flash transient method
stiffness change
