液体推进剂消耗对大型卫星结构动特性的影响分析
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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.
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.
引文
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[3]Djerassi S.An algorithm for simulation of motions of variable-mass system[J].Journal of Guidance,Control andDynamics,1998,21(3):427-434.
[4]Cveticanin L.Conservation laws in systems with variablemass[J].Journal of Applied Mechanics,1993,60(12):954-958.
[5]Kane T R,Levinson D A.Formulation of equations of motionfor complex spacecraft[J].Journal of Guidance Control andDynamics,1980,3(2):99-112.
[6]Pan Z W,Xing Y F,Zhu L W,et al.Liquid propellantanalogy technique in dynamic modeling of launch vehicle[J].Science China:Technological Sciences,2010,53(8):2102-2110.
[7]潘忠文,王旭,邢誉峰,等.基于梁模型的火箭纵横扭一体化建模技术[J].宇航学报,2010,31(5):1310-1316.PAN Zhongwen,WANG Xu,XING Yufeng,et al.A beammodel based longitudinal-lateral-torsional integrated modelingtechnique for launch vehicle[J].Journal of Astronautics,2010,31(5):1310-1316.(in Chinese)
[8]Brennen C E.A review of added mass and fluid inertial forces[R].AD-A110190,1982.
[9]胡盈辉,庄茁,由小川.大型储液罐在地震作用下的附加质量法研究[J].压力容器,2009,26(8):1-6.HU Yinghui,ZHUANG Zhuo,YOU Xiaochuan.Added massapproach to a large-scale liquid-storage tank under seismicpitations[J].Pressure Vessel Technology,2009,26(8):1-6.(in Chinese)
[10]刘焕忠,李青,庄茁,等.发展附加质量模型应用于储液罐的动力分析[J].工程力学,2005,22:161-171.LIU Huanzhong,LI Qing,ZHUANG Zhuo,et al.Development of added mass model and application to dynamicanalysis of cylindrical tanks[J].Engineering Mechanics,2005,22:161-171.(in Chinese)
[11]李道奎,刘林,万军.牵制释放过程中火箭液体推进剂的建模研究[J].强度与环境,2008,35(6):14-18.LI Daokui,LIU Lin,WAN Jun.Study of the model ofrocket’s liquid propellant in the process of hold-own andrelease[J].Structure&Environment Engineering,2008,35(6):14-18.(in Chinese)
[12]Damir S,Zeljan L,Damir V.Virtual mass measurement ofcantilever beam partially submerged in fluid[C]∥International Symposium on Coupled Methods in NumericalDynamics,Split,Croatia,2009:303-310.
[13]Abdullah A K.The Virtual Mass of a Rotating Sphere inFluids[J].Journal of Applied Mechanics,2005,72:801-802.
[14]韩增尧.航天器充液贮箱的动强度分析[C]∥MSC.Software中国会议论文集,2002.HAN Zengyao.Dynamic analysis of liquid-filled spacevehicle[C]∥MSC.Software Conference,2002.(inChinese)
[15]MSC.Software Corporation.Advanced dynamic analysis user'sguide[M].2005.
[16]富明慧,尹久仁.蜂窝芯层的等效弹性参数[J].力学学报,1999,31(1):113-118.FU Minghui,YIN Jiuren.Equivalent elastic parameters ofthe honeycomb core[J].Acta Mechanica Sinica,1999,31(1):113-118.(in Chinese)
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