摘要
飞行器气动加热使结构力学性能下降,同时在结构内部产生很高的温度及温度梯度,产生不均匀的热应力,影响了结构的固有动力学特性。对一变厚度板进行了瞬态热环境下的结构模态分析。结果表明,受热后结构固有频率均呈下降趋势,频率之间带宽变窄,并且热效应对一阶弯扭耦合模态影响最大。
The aerodynamic heating induces the decrease of structural mechanical property of flight device, and causes high temperature and high temperature gradient which generates non-uniform thermal stress. As a result, the natural dynamic characteristics of structure is effected. A variable-thickness plate is modelled to analyse the structural model under the transient thermal environment. The results illustrate that the nature frequency decreases due to aerodynamic heating, the frequency band width narrow down and the first bending-torsion couple frequency declines sharply due to the thermal effect.
出处
《导弹与航天运载技术》
北大核心
2009年第5期50-52,56,共4页
Missiles and Space Vehicles
关键词
热环境
振动
模态
Thermal environment
Vibration
Model
