摘要
为分析航天器平面薄膜结构(包含薄膜和绳索张拉系统)的动力学特性,对真空和空气中的多花边平面薄膜结构的模态进行了有限元仿真分析,且构建了一套测试平面薄膜结构模态的试验系统,分别利用摄影测量法和扫描式激光测振仪对平面薄膜结构的平面度和模态进行了测量,试验结果验证了模态仿真分析的正确性。进一步的分析表明,平面薄膜结构的基频近似与绳索拉力的平方根呈正比,且基频随花边半径增大而减小,但减小幅度很小,说明增大绳索拉力对平面薄膜结构基频的提高比减小花边半径对基频的提高要明显得多。
In order to analyze dynamic characteristics of flat membrane structures(including membrane and tensioning system),modal analysis for a flat membrane structure with multiple pockets in vacuum and air is carried out by finite element simulation and a modal testing system is built.Flatness of the flat membrane structure is measured by photogrammetric testing technique and the modal is tested by a scanning laser vibrometer.Validity of the modal simulation analysis is demonstrated by experimental results.Based on the verified modeling technique,further research results show that the fundamental frequency of flat membrane structures is approximately proportional to the square root of cable tension force and the fundamental frequency decreases with the in creasing of radius of pocket,but the decrease magnitude is small.Therefore,in order to increase the fundamental frequency of flat membrane structures,increasing cable tension force is much more efficient than decreasing radius of pocket.
引文
[1]Delapierre M,Pellegrino S.Spin-stabilized membrane antenna structures[C]//2nd AIAA Spacecraft Structures Conference.Washington D.C.:AIAA,2015:1-15
[2]Potvin M J,Montminy S,Brunel S,et al.Testing of a deployable SAR membrane antenna mechanical prototype[C]//49th AIAA/ASME/ASCE/AHS/ASC Structures,Structural Dynamics,and Materials Conference.Washington D.C.:AIAA,2008:1-12
[3]左华平,冯煜东,王虎,等.太阳帆航天器研究进展及其关键技术分析[J].真空科学与技术学报,2016,36(1):117-124Zuo Huaping,Feng Yudong,Wang Hu,et al.Latest development of solar sail research and analysis of its key technology[J].Chinese Journal of Vacuum Science and Technology,2016,36(1):117-124(in Chinese)
[4]Okuizumi N,Satou Y,Mori O,et al.Investigation of the deformation and stiffness of spinning solar sail membrane of IKAROS[C]//4th AIAA Spacecraft Structures Conference.Washington D.C.:AIAA,2017:1-10
[5]Kukathasan S,Pellegrino S.Vibration of prestressed membrane structures in air[C]//43rd AIAA/ASME/ASCE/AHS/ASC Structures,Structural Dynamics,and Materials Conference.Washington D.C.:AIAA,2002:1-11
[6]Fang H,Yang B,Ding H,et al.Dynamic analysis of large in-space deployable membrane antennas[C]//The13th International Congress on Sound and Vibration.Vienna:ICSV,2006:1-6
[7]肖薇薇,陈务军,付功义.空间薄膜阵面预应力导入效应及影响因素[J].宇航学报,2010,31(3):845-849Xiao Weiwei,Chen Wujun,Fu Gongyi.Pre-stress introduction effects and influence factors investigation for the space planar film reflect-array[J].Journal of Astronautics,2010,31(3):845-849(in Chinese)
[8]王磊,李元齐,沈祖炎.薄膜振动附加质量试验研究[J].振动工程学报,2011,24(2):125-132Wang Lei,Li Yuanqi,Shen Zuyan.Experimental investigation on the added mass of membranes vibrating in air[J].Journal of Vibration Engineering,2011,24(2):125-132(in Chinese)
[9]陈宇峰,陈务军,邱振宇,等.空气对预应力薄膜结构模态的影响[J].浙江大学学报(工学版),2015,49(6):1123-1127Chen Yufeng,Chen Wujun,Qiu Zhenyu,et al.Effects of air on modal behavior of pre-stressed membrane structure[J].Journal of Zhejiang University(Engineering Science),2015,49(6):1123-1127(in Chinese)
[10]邱振宇,陈务军,赵兵,等.充气尾翼湿模态分析与试验研究[J].振动与冲击,2016,35(15):140-148Qiu Zhenyu,Chen Wujun,Zhao Bing,et al.Wet modal analysis and tests for pneumatic empennages[J].Journal of Vibration and Shock,2016,35(15):140-148(in Chinese)
[11]李庆祥,孙炳楠,顾正维.考虑空气耦合的薄膜结构动力分析[J].计算力学学报,2006,23(4):476-482Li Qingxiang,Sun Bingnan,Gu Zhengwei.Dynamic analysis of membrane structures interacting with air[J].Chinese Journal of Computational Mechanics,2006,23(4):476-482(in Chinese)
[12]Minami H.Added mass of a membrane vibrating at finite amplitude[J].Journal of Fluids and Structures,1998,12:919-932
[13]Greschik G,White C V,Salama M A.On the precisely uniform and uniaxial tensioning of a film sheet via integrated catenary[C]//44th AIAA/ASME/ASCE/AHS/ASC Structures,Structural Dynamics,and Materials Conference.Washington D.C.:AIAA,2003:1-11
[14]Shimoda Y,Watanabe K,Sakamoto N,et al.Development of stereo camera system for accurate observation of deployable membranes onboard cubesat[C]//55th AIAA Aerospace Sciences Meeting.Washington D.C.:AIAA,2017:1-7
