液体推进剂消耗对大型卫星结构动特性的影响分析  

Dynamic analysis of a large scale satellite structure with the liquid propellant consuming

作　　者：武新峰[1] 雷勇军[1] 李道奎[1] 

机构地区：[1]国防科技大学航天与材料工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2012年第4期38-42,共5页Journal of National University of Defense Technology

基　　金：教育部新世纪优秀人才支持计划项目(NCET-08-0148)

摘　　要：为了研究液体推进剂消耗对某大型卫星结构动特性的影响,采用简化的"弹簧-质量"模型分析了推进剂消耗对结构动特性的影响趋势;基于MSC.PATRAN/NASTRAN给出了动力学分析过程中液体推进剂的等效建模和分析方法,包括梁单元法、附加质量法、"RBE3-质量点"单元法和虚拟质量法等;建立了该卫星结构的有限元模型,进行了结构动力学特性和动响应分析,讨论了液体推进剂消耗对其动特性的影响规律。研究结果表明:随着推进剂的消耗,卫星整体振型的固有频率逐渐增大,而部分局部振型的固有频率保持不变;随着推进剂的消耗,卫星仪器安装板动力学响应峰值逐渐增大,所对应的频率也逐渐增大。A simplified ＇ Spring-Mass＇ dynamic model and dynamic analysis were performed to obtain the influence of propellant consuming on the dynamic properties of a large scale satellite structure. Then the finite element modeling and analysis methods, including the beam modeling method, added with the mass method, the ＇ RBE3-Mass＇ modeling method and the virtual mass method, were given based on MSC. PATRAN/ NASTRAN. In the end, the satellite finite element model was established and the dynamic analysis was executed. The analysis results indicate that ： （ 1 ） the frequencies of main mode shapes will raise with the propellant consuming, while those of local shapes will not change ; （ 2 ） The frequency and magnitude of response will raise with the propellant consuming.

关 键 词：液体推进剂 卫星结构 有限元建模 结构动特性分析 

分 类 号：V415[航空宇航科学与技术—航空宇航推进理论与工程]