大气环境下，空气产生的附加质量会大大折减薄膜阵面的刚度，致使薄膜阵面的自振特性与在实际真空工作环境中存在较大误差。基于针对真空中薄膜阵面动力特性进行试验验证，而开展真空测试试验仍然存在困难的实际情况，为忽略空气附加质量的影响，提出以大气环境下的网格膜等代真空中薄膜测试自振特性的方法。通过对比两者振动特性数值分析结果以及采用双轴张拉装置和非接触式位移动态采集设备进行试验验证，研究得到以大气环境下网格膜自振频率等代真空中阵面膜频率的结论公式。
Abstract
In atmospheric environment,the additional mass produced by air greatly can reduce the stiffness of a planar film reflect-array to make its natural vibration characteristics have a larger error compared with those in actual vacuum environment. In order to test and verify dynamic characteristics of a planar film reflect-array,considering practical tests in vacuum environment being unmanageable and uneconomical,an equivalent approach to measure a grid film’s natural vibration characteristics in atmospheric environment neglecting the effect of additional mass produced by air to substitute those of a planar film reflect-array in vacuum environment was proposed. The numerical simulation results for natural vibration characteristics of both cases were contrastively analyzed,and the test verification was conducted using biaxial tension device and non-contact displacement dynamic collection equipment. Finally,a useful formula was obtained to calculate the equivalent natural frequencies of a planar film reflect-array in vacuum environment using the corresponding test values of a grid film in atmosphere environment.
关键词
薄膜阵面 /
自振特性 /
网格膜 /
等代方法
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Key words
Planar film reflect-array /
Free vibration characteristics /
Grid film /
Equivalent approach
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参考文献
[1] Cornwell P J，Bendiksen O O. Localization of vibrations in large space reflectors [J]. AIAA Journal,1989,27(2):219-226.
[2] Everstine G C，Henderson F M. Coupled finite element/boundary element approach for fluid-structure interaction[J]. Journal of Acoustic Society of America,1989,87(5):1938-1947.
[3] Biship J A. Shape correction of initially flat membranes by a genetic algorithm [C]//The 39th AIAA/ASME/AHS /ASC, Structure Dynamics, and Materials Conference and Exhibit. Washington, DC: AIAA. Long Beach, CA. USA. 1998: 2309-2312.
[4] Lai C Y，You Z, Pellegrino S. Shape of deployable me-mbrane reflectors [J]. Journal of Aerospace Engineering,1998,11(3):73-80.
[5] Naboulsi S. Investigation of geometric imperfection in inflatable aerospace structures [J]. Journal of Aerospace Engineering, 2004,17(3):98-105.
[6] Fowler J，Lagerquist N, Leve H. Effect of air mass on modal tests [C] //In Proceedings of 5th International Modal Analysis Conferences, 1987, 1078-1083.
[7] Dowell E，Dugundii J, Perkin B. Subsonic flutter of panels on continuous elastic foundations [J]. Journal of American Institute of Aeronautics and Astronautics,1963,1(5):1146-1154
[8] Minami H. Added mass of a membrane vibrating at finite amplitude [J]. Journal of Fluids and Structures, 1998,12(7):919-932.
[9] Yadykin Y，Tenetov V，Levin D. The added mass of a flexible plate oscillating in a fluid [J]. Journal of Fluids and Structures, 2003,17(1):115-123.
[10] 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):845-849.
XIAO Wei-wei, CHEN Wu-jun, FU Gong-yi. Pre-stressed introduction effects and influence factors investigation for the space plannar film reflect-arry [J]. Journal of astronatics, 2010, 31(3): 845-849.
[11] 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):1123-1127.
CHEN Yu-feng, CHEN Wu-jun, QIU Zhen-yu, et al. Effecs of air on modal behavior of pre-stressed membrane structure [J]. Journal of Zhejiang University: Engineering Science, 2015, 49(6): 1123-1127.
[12] Li Y Q，Wang L，Shen Z Y，et al. Added mass estimation of flat membranes vibrating in still air [J]. Journal of Wind Engineering and Industrial Aerodynamics,2011,99(8):815-824.
[13] 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)：125-132.
WANG Lei, LI Yuan-qi, SHEN Zu-yan. Experimental investigation on the added mass of membranes vibrating in air [J]. Journal of vibration engineering, 2011, 24(2): 125-132.
[14] He Y L，Chen Y F，Chen W J. Theory and experiment research on the static capability and dynamic property of inflatable beams [C]//The 4th International Conference on Textile Composites and Inflatable Structures- Structural Membranes. Munich, GERMANY, OCT 09-11, 2013.
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