金属热防护系统动力学建模研究  

Study on dynamic modeling of metallic thermal protection system

作　　者：王亮[1] 陈怀海[1] 贺旭东[1] 

机构地区：[1]飞器结构力学与控制教育部重点实验室,南京航空航天大学振动工程研究所,南京210016

出　　处：《固体火箭技术》2011年第5期639-643,共5页Journal of Solid Rocket Technology

基　　金：自然科学基金(10972104)

摘　　要：研究了金属热防护系统的动力学建模及简化计算方法。首先,给出了蜂窝结构面外的等效热导率、比热容、密度和弹性系数的表达式,并给出了算例验证;其次,建立了包括外层蜂窝、中间防热层、内层蜂窝、应变隔离层和承力结构的完整模型,研究了外表面受高温加热情况下结构的热力学响应及弯曲模态;最后,提出了带金属热防护系统的结构弯曲热模态计算的简化方法,实现了带金属热防护系统的结构弯曲热模态的快速计算,而且发现温度对结构模态有较大影响,当承力结构温度为130℃左右时,前三阶弯曲固有频率均减小4%以上,第三阶下降最明显,达到9%左右。The dynamic modeling of metallic thermal protecteon system（MTPS） and the simplified method were studied.Firstly,the expression of equivalent thermal conductivities,specific heat capacity,density and elastic coefficient of metallic honeycombs were presented,which were verified by numerical examples.Secondly,a complete model with outer honeycombs,middle thermal protection layer,inner honeycombs,isolation and load-carrying construction was established,and the thermodynamical response and the bending modes of airframe structure under high temperature were studied.Thirdly,an simplified model for bending modes calculation was proposed.Results show that it is effective in fast calculation of bending modes of the structure with MTPS,and the influence of high temperature on structure modes is notable.When the temperature of the load-carrying construction is about 130 ℃,the first three order bending inherent frequencies decrease by more than 4%,among which the third mode decreases by 9%.

关 键 词：金属热防护系统 动力学 热力学 蜂窝 模态分析 

分 类 号：V414.6[航空宇航科学与技术—航空宇航推进理论与工程]