用户名: 密码: 验证码:
桁架式展开结构设计、分析及试验
详细信息    本馆镜像全文|  推荐本文 |  |   获取CNKI官网全文
摘要
随着空间科技的发展,各相关学科对空间可展结构提出了更高的要求,主要体现在大口径、高精度两方面,为此各国学者提出了形式众多的空间可展结构概念。可展结构作为一种新型结构形式,近些年来得到了广泛的应用,根据其用途不同可分为空间可展结构和地面可展结构。在空间可展结构当中,四面体桁架式可展天线是其中最具潜力的结构形式之一,是本文研究的重点。本文对四面体桁架式可展天线的结构设计、分析及试验进行了深入系统的研究。
     论文首先在大量查阅国内外文献的基础上,总结了国内外空间可展结构的应用情况及研究现状,阐述了课题的研究意义。
     接着在四面体桁架式可展天线结构设计理论的基础上,开发了参数化仿真建模程序,使用AutoCAD的二次开发工具,通过lisp语言在AutoCAD中显示整个天线的实体模型;更改输入参数,可建立任何尺寸天线的实体模型,然后运用该设计程序设计并句口工了一个2m×2m的天线模型,验证结构设计程序的可靠。
     天线设计完成后,除了要能顺利展开之外,展开后能达到的精度也是设计者十分关心的指标,因此本文使用基于PhotoModeler软件建立摄像测量系统,对一个2m×2m的天线模型和6m×2.8m天线进行精度测量,得到天线的空间节点位置;然后采用的三种不同的方法拟合抛物面,并编程序计算;同时也采用Mathematica软件拟合抛物面;最后比较各种不同的方法,找到一个最佳吻合抛物面并得到最小均方根误差。
     根据结构设计可知,四面体桁架式可展天线的花盘节点不是均匀的60°,这给制造带来了很大的不便。本文研究了将天线花盘节点加工成均匀的60°时的装配内力,并编程序方便的计算这些装配内力。假设在收拢状态下,天线也有装配内力,且与展开状态下的内力相同,同时假设这些装配内力在展开过程中保持不变,然后修改基于广义逆理论编制的四面体桁架式天线展开分析程序,将装配内力引入程序中,分析其对天线展开过程的影响。
     航天发射是一个昂贵的项目,一旦失败,损失是巨大的,因此对空间展开结构的可靠性研究是非常必要的。论文从研究单个关节的可靠度出发,分析指出了其运动功能可靠性中包含了矩的功能函数和功的功能函数这两个并联的功能函数;利用随机函数的矩法和可靠性分析中的一次二阶矩法,为天线的展开过程中的各个分解步骤构建了按矩的功能函数和按功的功能函数对应的可靠度计算表达式;然后构建关节的失效概率函数,进一步分析其展开次数与可靠度的关系;接着使用故障树的分析方法和模糊可靠性分析法来分析整体天线的可靠度。
     在进行了理论分析和仿真软件的研究之后,通过垂击法对四面体桁架式可展天线进行模态测试,然后将测试结果和有限元分析结果进行对比,验证天线的有限元模型,得到天线的模态数据。
     用基于广义逆理论编制的环形桁架天线展开过程分析程序进行计算,分析了展开过程中驱动力的变化规律及引入运动方程的方法;选择地面零重力模拟时的两种悬吊方式,分析不同悬吊方式对展开过程的影响;考虑了网面对展开过程的影响;为了使结构在初始展开阶段易于展开,在节点上安装了扭簧,论文分析了扭簧对展开过程的影响;最后对环形桁架天线在展开过程中的刚度进行了分析。
Following the development of the aeronautical technology, higher request was brought forward to deployable antenna on satellites from every relative field. A lot of structural concept for deployable antenna was given out by aeronautic scholar. As a new kind of structure, the deployable structures are more and more widely used in the fields of astronautics, building structure and military engineering, etc. They can be divided into space deployable structures and ground deployable structures. In space deployable structures, tetrahedron deployable truss structure is a promising kind, which has most potential for space application. So it is an important content of this paper. This dissertation presents a program that used to design a tetrahedron deployable truss antenna, then analyzes and test for this kind of antenna.
     Firstly, after referring a lot of pertinent literature world widely, the application of deployable space structure and the research actuality of its deployment process were summarized, the research significance is presented.
     Afterward, based on the antenna design theory, this dissertation describes a wayto develop a program for designing tetrahedron deployable truss antenna. It uses the lisp which is the secondary development tool of AutoCAD to visualize the solid model of antenna. With this program, one can easily build a solid model in any dimension. Then we design and fabricate a 2m*2m antenna to test the program. The result seems quite well.
     After built an antenna, besides its deployability, the designer usually cares much about its surface error. So a non-contact Photogrammetric measure system was built on the base of PhotoModeler software packages to measure the surface error of an antenna model with 2 m caliber and 6m*2.8m caliber, and get their node coordinates. Then uses three methods to fit paraboloid and program it. Also this paper uses Mathematica to fit paraboloid. Finally the best fit paraboloid and least RMS are obtained.
     According to the structure design theory, all of the nodes in tetrahedron deployable truss antenna are not well proportioned; their angle is not 60°but close to this angle. This dissertation wants to make the nodes to be identically in 60°, thus there is internal force in antenna. So it is necessary to analyze the internal force. Suppose the internal force is constantly in deploying process, and then it can be added in the Deployment Dynamic Analysis Program and study its impact to deploying process.
     Spaceflight launch is an expensive project, once failed, the cost is huge. So it is necessary to take reliability study. This paper breaks up the antenna joint function and find its movement reliability has two parallel performance functions: the performance function according to deploying work and that according to deploying moment; Corresponding to the decomposed phase in deploying process, the expressions of two performance functions were established. Then two-kind reliabilities can be calculated from the two performance functions by means of the random functional moment method and the second moment method for reliability analysis. The movement reliability of one deployable joint can be got from two parallel reliability models. Then establishes the failure function and analyzes the relations of deploying times and reliability. Also the dissertation uses Faulty Tree Analysis Method and Fuzzy Probability Method to analyze the reliability.
     After theory analyze, the mode test is taken on tetrahedron deployable truss antenna. Compare the test result and theoretical result to verify the finite model and confirm the test data.
     Use the deploying process simulation software for circular truss antenna to analyze a 30m antenna with tested cable force. Design two methods to hang the antenna and analyze the effect of gravity to deploying process. Consider the effect of mesh. There are rotational springs in nodes; the program also counts in its function. Finally the stiffness is analyzed during the deploying process of circular deployable truss antenna.
引文
[1]Ribble.T.W.,Woods.A.A.On the Design of Large Space Deployable Modular Antenna Reflector,15th Aerospace Mechanisms Symposium,NASA-2181-CP.
    [2]John.M.Primary Requirements for Large Space Structure,AIAA-81-0443,2nd AIAA Conf.on Large Space Platforms,1981.
    [3]Escrig F.,Expandable space structures[J].Internaltional Journal of Space Structures,1985,1(2):79-91.
    [4]Escrig F.and Valcarcel J.P.,Geometry of expandable space structures[J].Internaltional Journal of Space Structures,1993,8(1/2):71-84.
    [5]Calladine C.R.and Pellegrino S.,First-order infinitesimal mechanisms[J].International Journal of Solids and Structures,1991,27(4):505-515.
    [6]S.Pellegrino,Structural computations with the singular value decomposition of the equilibrium matrix[J].International Journal of Solids and Structures,1993,30(21):3025-13036.
    [7]You Z.and Pellegrino S.,Foldable bar structures[J].International Journal of Solids and Structures,1997,34(15):1825-1847.
    [8]Gantes C.,Conner J.J.and Logcher R.D.,A systematic design methodology for deployable structures[J].International Journal of Space Structures,1994,9(2):67-86.
    [9]Freeland.R.E.,Survey of Deployment Antenna Concepts:Large Space Antenna Systems Technology,NASA-2269,Part Ⅰ,1983.
    [10]Chew.M,Kumar.P.Conceptual Design of Deployable Space Structures from the viewpoint of symmetry,Int.J.Space Structures,1993.
    [11]Das.A.,Obal M.W.,Revolutionary Satellite Structural Systems Technology:A Vision for the future,Aerospace Conference,1998 IEEE,Volume 2,1998.
    [12]余永辉。开合屋盖结构的设计。浙江大学硕士学位论文。杭州:浙江大学。2004。
    [13]杨治。开合屋盖结构设计方法研究。浙江大学硕士学位论文。杭州:浙江大学。2005。
    [14]Gunnar Tibert,Depolyment Tensegrity Structure for Space Applications,Royal institute of Technology Department of Mechanics.2002.
    [15]Guest.S.D.,Pellegrino.S.A new Concept for solid surface deployable antennas.Acta Astronautica 38,2(1996)
    [16]Miura.K.,Pellegrino.S.Structural concepts.1999.
    [17]P.Alan Jones,Brian R.Spence.Spacecraft Solar Array Technology Trends[J].IEEE,Aerospace Conference.1998,1:141-152.
    [18]陈务军,空间展开桁架结构设计原理与展开动力学分析理论研究,浙江大学博士学位论文(1998).
    [19]陈向阳,可展桁架结构展开过程和动力响应分析与结构设计,浙江大学博士学位论文(2000).
    [20]张京街,弹簧驱动空间可展桁架结构设计与分析理论研究,浙江大学博士学位论文(2001).
    [21]胡其彪,空间可伸展结构的设计与动力学分析研究,浙江大学博士学位论文(2001).
    [22]岳建如,空间可动机构结构设计与控制分析,浙江大学博士学位论文(2002)
    [23]TRW.Inc.TRW-built AstroMesh reflector deployed aboard Thuraya spacecraft.http://www.trw.com(5 December 2000).
    [24]Thomson.M.W.The AstroMesh deployable reflector.In IUTAM-IASS Symposium on Deployable Structures:Theory and Application,Cambridge.UK,1998.
    [25]宋燕平,肖勇,马小飞.空间大型可展天线结构概述,星载大型可展开天线技术研讨会会议论文集,总装备部卫星技术专业组,2003年4月.
    [26]THOMSON,M.W.The AstroMesh deployable reflector.In Proceeding of the Fifth International Mobile Satellite Conference.
    [27]Thomson M.W.,The Astromesh deployable reflector,IEEE Antennas and Propagation Society,1999,Vol.3:1516-1519.
    [28]苏斌。索杆式伸展臂的设计、分析与试验。浙江大学硕士学位论文。杭州:浙江大学。2004。
    [29]Crone,G,Large deployable reflector antenna for advanced mobile communications.ESA/Industry Briefing Meeting.9 May,2000.
    [30]Freeland.R.E.,Bilyeu.G.D.,Veal.G.R.Development of flight hardware for a large inflatable antenna experiment.In 46th International Astronautical Congress(Oslo,Norway,2-6 October 1995).
    [31]关富玲,李刚,夏劲松,余永辉。充气可展空间结构,卫星结构与机构技术进展研讨会会议论文集,总装备部卫星技术专业组,2003年9月.
    [32]Ding,H.J.,Guo,F.L.and Hou,P.F.A general solution for static piezothermoelectric problems of crystal class 6mm solids.Aeta Mechanica Solida Sinica,1999,Vol.12,189-197.
    [33]Ding,H.J.,Guan,F.L.and Hou,P.F.A general solution for piezothermoelasticity of transversely isotropic piezoelectric materials and its applications.International Journal of Engineering Science,2000,Vol.38,1415-1440.
    [34]Ding,H.J.,Guan,F.L.,Hou,P.F.and Zou,D.Q.On the equilibrium of piezoelectric bodies of revolution.International Journal of Solids and Structures,2000,Vol.37,1293-1326.
    [35]刘延柱。多刚体系统动力学[M]。北京:高等教育出版社。1987。
    [36]刘延柱。高等动力学[M]。北京:高等教育出版社。2001。
    [37]休斯敦,刘又午。多体系统动力学[M]。天津:天津大学出版社。2001。
    [38]Fletcher H.J.,Rongved L.,Yu.E.Y.,Dynamics analysis of a two-body gravitationally oriented satellite[J].Bell System Technical Journal.1963,42(5):2239-2266.
    [39]Hoker W.W.and Margulies G.,The dynamics attitude equations for an n-body satellite[J].Journal of Astronautical Science,1965,12(4):123-128.
    [40]Ando Kazuhide,Mitsugi Jin,Senbokuya Yurni,Analyses of cable-membrane structure combined with deployable truss[J].Computers and Structures,2000,74(1):21-39.
    [41]Wang John T.,Johnson Arthur R.,Deployment simulation of ultra-lightweight inflatable structures[J].AIAA/ASME/ASCE/AHS/ASC 43rd Structures,Structural Dynamics and Materials Conference,2002,1:484-501.
    [42]K.S.Anderson,An order-N formulation for motion simulation of general constrained multirigid-body systems[J].Computers and structures,1992,43:565-572.
    [43]D.-S.Bae,J.M.Han,J.H.Choi and S.M.Yang,A generalized recursive formulation for constrained multibody dynamics[J].International Journal for Numerical Methods in Engineering,2001,50:1841-1859.
    [44]D.-S.Bae,J.K.Lee,H.J.Cho and H.Yae,An explicit integration method for realtime simulation of multibody vehicle models[J].Computer Methods in Applied Mechanics and Engineering,2000,187:337-350.
    [45]R.Serban,D.Negrut,F.A.Potra and E.J.Haug,A topology based approach for exploiting sparsity in multibody dynamics in Cartesian formulation[J].Mechanics of Structures and Machines,1997,25:379-396.
    [46]R.Wehage and E.J.Haug,Generalized coordinate partitioning for dimension reduction in analysis of constrained mechanical systems[J].ASME Journal of Mechanical Design,1982,104:247-255.
    [47]何旭初。广义逆矩阵的基本理论和计算方法[M]。上海:上海科学技术出版社。1985。
    [48]韩军,陈怀海等。基于遗传算法的多振动台随机振动控制方法[J].航空学报,2003,24(1):39-41.
    [49]程云鹏。矩阵论[M]。西安:西安工业大学出版社。2001。
    [50]王松桂,杨振海。广义逆矩阵及其应用[M]。北京:北京工业大学出版社。1996。
    [51]Penrose R.,A generalized inverse for matrices[J].Proc.Cambridge Phil.Soc.51,1955:406-413.
    [52]Kawaguichi K.,Hangai Y.,Analysis of stabilizing paths and stability of kinematically indeterminate frameworks.Proceeding of the 3rd Summer Colloquium on shell and Spatial Structures.1990:195-204.
    [53]Tanaka H.,Hangai Y.,Rigid body displacement and stabilization conditions of unstable structures.Shells,Membranes and Space Frames,Proceedings IASS Symposium.Osaka,1986:55-62.
    [54]陈建军,张建国,段宝岩,王小兵。大型星载天线的展开系统失效树分析[J]。机械设计与研究,2005,21(3):6-9.
    [55]张建国,陈建军,段宝岩,胡太彬。基于非概率模型的星载天线展开机构可靠性分析[J]。西安电子科技大学学报(自然科学版),2006,33(5):739-743.
    [56]陈建军,王芳林,费小立,车建文。多工况下杆系结构的概率优化设计[J]。工程力学,2001,18(2):113-119.
    [57]马洪波,陈建军,马孝松,梁震涛。基于体系可靠性的随机桁架结构优化设计[J]。西安电子科技大学学报(自然科学版),2005,32(4):593-598.
    [58]陈建军,杜雷,催明涛等。基于概率的平面连续体结构拓扑优化[J]。应用力学学报,2006,23(2):203-207.
    [59]陈建军,郜文文,赵丽琴等。随机参数弹性连杆机构运动功能的可靠性分析[J]。机械设计与研究,2006,22(3):19-22.
    [60]Bendsoe M P,Kikuchi N.Generating optimal topologies in structural design using a homogenization method[J].Computer Methods in Applied Mechanics &Engineering,1988,71:197-224.
    [61]Bendsoe M P,Sigmund O.Material interpolations in topology optimization[J].Archive of Applied Mechanics,1999,69:635-654.
    [62]R.W.Herr,G.C.Horner.Deployment tests of a 36-element tetrahedral truss module[R].Virginia:Langley Research Center.1980.
    [63]Hiroaki Tsunoda,Ken-ichi Hariu,Yoichi Kawakami,Kazuo Miyoshi,et al.Structural design and deployment test methods for a large deployable mesh reflector.AIAA-1997-1148.
    [64]韦娟芳。空间4~10米可展开天线的动力耦合分析及试验技术研究。浙江大学博士学位论文。杭州:浙江大学。2002。
    [65]Bush H.G.,Herstrom C.L.,Stein P.A.,Johnson R.R.,Synchronously deployable tetrahedral truss reflector[J].In its Large Space Antenna Systems Technology,1984,237-250.
    [66]Guan Fu-ling,Shou Jian-jun,Hou Guo-yong,Zhang Jing-jie,Static analysis of synchronism deployable antenna[J].Journal of Zhejiang University Science A,2006,7(8):1365-1371.
    [67]张淑杰,关富玲,张京街。空间可展结构能量节点的设计和动力分析[J]。工程设计,2001,2:53-56.
    [68]陈务军,付功义,董石磷,关富玲等。扭簧驱动构架式空间展开天线结构分析[J]。宇航学报,2001,22(1),9-14.
    [69]关富玲,侯国勇,赵孟良.构架式可展开天线结构设计的程序实现.工程设计学报,2006,13(2),108-113.
    [70]C.J.Gantes and R.D.Logcher.Deployability Condition for Curved and Flat,Polygonal and Tranpezoidal Deployable Structure[J].International Journal of Space Structures,Vil.8,Nov,1993:97-106.
    [71]C.Y.Lai and S.Pellegrino,Feasibility Study of a Deployable Mesh Reflector.Deployable Structure Laboratory Department of Engineering,University of Cambridge,2001.9.
    [72]宋燕平,肖勇,马小飞。空间大型可展天线结构概述。星载大型可展开天线技术研讨会会议论文集,总装备部卫星技术专业组,2003年4月。
    [73]朱钟淦,叶尚辉。天线结构设计[M]。北京:国防工业出版设。1980。
    [74]Guest S.D.,Pellegrino S.,New concept for solid surface deployable antennas[J].Acta Astronautic,1996,38(2):103-113.
    [75]Guest S.D.,Pellegrino S.Design optimization of a solid surface deployable reflector[A].Proceedings,IUTAM Symposium on Optimization of Mechanical Systems[C],Stuttgart,1995:105-112.
    [76]余承飞,方勇,余承飞,方勇。AutoCAD 2000二次开发技术[M]。北京:人民邮电出版社。1999。
    [77]郭朝勇。AutoCAD R14(中文版)二次开发技术[M]。北京:清华大学出版社。1999。
    [78]姚涵珍,周桂英,楚大庆。AutoCAD 2004交互工程绘图及二次开发[M]。北京:机械工业出版社。2004。
    [79]关富玲。空间可展开式天线结构设计及制造。2001-1-26.
    [80]张京街,关富玲。大型切割旋转抛物面展开结构的设计[J]。工程设计学报,2000(1):46-48.
    [81]许波,刘征。MatLab工程数学应用[M]。北京:清华大学出版社。2000。
    [82]刘志俭。MATLAB应用程序接口用户指南[M]。北京:科学出版社。2000。
    [83]周明。MATLAB图形技术[M]。西安:西北工业大学出版社。1999。
    [84]陈桂明。应用MATLAB建模与仿真[M]。北京:科学出版社。2001。
    [85]张志涌。MATLAB教程[M]。北京:北京航空航天大学出版社。2001。
    [86]付子傲。电子经纬仪用于抛物面天线检测[D]。郑州:解放军测绘学院,1989.
    [87]徐忠阳。小型非接触式测量系统及其在天线自重变形测量中的应用[D]。郑州:解放军测绘学院,1990.
    [88]李广云,李宗春。TC2002极坐标测量系统在大型天线检测中的应用[J]。测绘工程,1999,8(4):35-39.
    [89]BRENNER M J.Measurements of Structural Deformations of Large Reflector Antennas[A].Antenna Measurements and Techniques Association Symposium.1995,55-59.
    [90]GOLDSMITH P.Resetting the Arecibo Primary Reflector Surface[J].The Arecibo Observatory Newsletter,2001,(32):1-4.
    [91]邵锡惠。军事工程摄影测量[M]。北京:解放军出版社,1991。
    [92]韩溥等。紫金山天文台13.7米射电望远镜天线表面精度的首次射电全息测量[J]。天文学报,1994,35(2):209.214.
    [93]杨珏。Mathematica应用指南[M]。北京:人民邮电出版社。1999。
    [94]孙魁明,张海彤。Mathematica工具软件大全[M]。北京:中国铁道出版社。1994。
    [95]裘宗燕。Mathematica数学软件系统的应用及其程序设计[M]。北京:北京大学出版社。1994。
    [96]岳建如,关富玲,陈向阳。大型可展构架式星载抛物面天线结构设计[J]。浙江大学学报:工学版,2001,35(3):238-243。
    [97]赵孟良,吴开成,关富玲。空间可展桁架结构动力学分析[J]。浙江大学学报:工学版。2005,39(11):1669-1674.
    [98]赵孟良,关富玲。考虑摩擦的周边桁架式可展天线展开动力学分析[J]。空间科学学报。2006,26(3):220-226.
    [99]Mengliang Zhao,Fuling Guan,Kinematic analysis of deployable toroidal spatial truss structures for large mesh antenna[J].Journal of the International Association for Shell and Spatial Structures,2005,46(3):195-204.
    [100]李刚。空间可展天线结构的设计分析与索膜结构分析。浙江大学博士学位论文。杭州:浙江大学。2004。
    [101]李刚,关富玲,夏劲松。环柱状柔性天线抛物面索网的网格生成技术计设计参数研究。卫星结构与机构技术进展研讨会会议论文集,总装备部卫星技术专业组,2003年9月。
    [102]关富玲,杨玉龙,赵孟良。星载可展开网状天线的网面成形和防缠绕设计[J]。工程设计学报。2006,13(4):271-276.
    [103]夏劲松,关富玲,李刚。张力天线的类型和反射面网格。卫星结构与机构技术进展研讨会会议论文集,总装备部卫星技术专业组,2003年9月。
    [104]余永辉,关富玲,陈向阳。可展桁架运动过程动力学模拟[J]。计算力学学报。2005。22(2):197-201.
    [105]李刚,关富玲。环形桁架可展天线抛物面索网的预拉力优化[J]。浙江大学学报:工学版,2005,39(10):1557-1660。
    [106]Emily M Smith.From Russia with TRIZ[J].Mechanical Engineering.New York:Mar 2003,125:18-20.
    [107]Danell Mann.Manufacturing technology evolution trends[J].Integrated Manufacturing Systems.Bradford 2002,13:86-90.
    [108]Masayoshi Misawa,Tetsuo Yasaka,Shojiro Miyake.Analytical and experimental investigations for satellite antenna deployment mechanisms[J].J Spacecraft,1989,26(3):181-187.
    [109]安德森 Anderson,R.T。可靠性设计手册[M]。北京:国防工业出版社。1981。
    [110]宋保维。系统可靠性设计与分析[M]。西安:西北工业大学出版社。2000。
    [111]陈举华。机械结构模糊优化设计方法[M]。北京:机械工业出版社。2002。
    [112]郭永基。可靠性工程原理[M]。北京:清华大学出版社。2002。
    [113]高社生,张玲霞。可靠性理论与工程应用[M]。北京:国防工业出版社。2002。
    [114]金星,洪延姬,沈怀荣,张峥。工程系统可靠性数值分析方法[M]。北京: 国防工业出版社。2002。
    [115]秦英孝。可靠性·维修性·保障性概论[M]。北京:国防工业出版社。2002。
    [116]陈长征,赵玲玲,刘磊,任建岳。空间遥感器支撑桁架的模态计算与试验[J]。光学精密工程。2007,15(8):1164-1169.
    [117]夏利娟,余音,金咸定。卫星构架结构固有频率特性的试验研究和优化设计[J]。上海交通大学学报。2004,38(11):1889-1891.
    [118]白珍娥,朱峰。卫星抛物面天线组合件的模态分析和模态试验[J]。中国空间科学技术。1991,4(2):52-57.
    [119]随机信号与振动分析系统使用说明书。南京:南京汽轮电机厂。1991。
    [120]罗鹰,段宝岩。周边桁架式展开天线的几何布局优化[J]。空间科学学报。2004。24(2):132-137.
    [121]狄杰建,段宝岩,仇原鹰,罗鹰。周边式桁架可展开天线的形面调整[J]。宇航学报。2004。25(5):583-586.
    [122]Greene,W.H.Effects of random member length errors on the accuracy and internal loads of truss antennas[J].Journal of Spacecraft and Rockets.1985,22(5):554-559.
    [123]张策,陈树勋,王子良等。弹性连杆机构的分析与设计[M].北京:机械工业出版社,1989。
    [124]Miura,K.Method of packaging and deployment of large membranes in space[J].Proceedings of 31st IAF Congress,Tokyo,paper no.IAF-80-A31,1980.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700