大型空间结构热-动力学耦合有限元分析  

Coupled thermal-dynamic FEM analysis of large scale space structures

作　　者：程乐锦[1] 薛明德[1] 

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《清华大学学报（自然科学版）》2004年第5期681-684,688,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八六三"高技术项目(863-2-2-1-9)

摘　　要：针对大型空间结构的热诱发振动问题,发展了一种热动力学耦合的有限元方法。将结构变形对入射热流的影响进行Taylor展开并略去高阶项,从而得到耦合结构变形的热传导方程,由振型叠加法得到减缩并解耦的动力学方程,然后通过时间积分方法混合迭代求解结构的热动力学响应。对哈勃太空望远镜太阳能帆板的热颤振行为,该方法所得数值解与文献理论解符合得较好。对复杂的空间结构给出了热动力学响应,并发现热动力学耦合效应和热诱发振动稳定性的决定因素是结构参数及加热条件。Thermally induced vibration of large space structures was analyzed using a coupled thermal-dynamic finite element method (FEM). The heat conduction equations were coupled with the structural deformations by expanding the heat generation terms in terms of powers of the deformations in Taylor series and neglecting higher-order items. Reduced, uncoupled motion equations were then obtained by modal superposition. The thermal-dynamic response of the space structures was determined by solving these equations with an iterative time integration method. Numerical results for the thermal flutter of the solar array on the Hubble Space Telescope agree well with the analytical solution. The thermal-dynamic responses for a typical complex space structure were analyzed. The result shows that the structural properties and heating conditions play a decisive role in the thermal-dynamic coupling and thermally induced vibration stability.

关 键 词：空间结构 热-动力学耦合 有限元分析 热诱发振动 热颤振 结构动力学 

分 类 号：V414.1[航空宇航科学与技术—航空宇航推进理论与工程]