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第 24卷第 5期机械科学与技术 Vol. 24 No. 5
2005年 5月 MECHAN ICAL SC IENCE AND TECHNOLOGY May 2005
文章编号: 1003 8728 (2005) 05 0612 04
大型空间柔性桁架结构模态实验研究
刘绍奎,闫桂荣
(西安交通大学机械结构强度与振动国家重点实验室,西安 710049)
刘绍2奎
摘要:提出杆系结构的内力脉冲激振法,克服了宽带随机激振法能量分散不易激起各阶模态以及正弦激励慢的缺
点,并用半正弦冲击波形完成了大型空间柔性桁架结构的模态实验,得到了系统的固有频率和模态振型。实验结果
与理论计算结果非常吻合,验证了理论计算方法的正确性。实验结果表明采用内力脉冲激振的方法能够有效地激
起结构的固有频率。实验所得振动参数可为下一步空间柔性桁架结构振动主动控制提供直接依据。
关键词:空间柔性桁架;模态实验;固有频率
中图分类号: O32 文献标识码: A
M oda l Exper im en ta l Investiga tion of the Large Space Flex ible Truss Structure
L IU Shao kui, YAN Gui rong
(State Key Laboratory ofMechanical Structural Strength and Vibration, Xi′an Jiaotong University, Xi′an 710049)
Abstract: The method of using impulse excitation of internal force to investigate rod structure was p ro
posed in this paper. Thismethod rectifies the defect in wide band random excitation method, i. e. the dif
ficulty in exciting each modal for energy disperse, and slow at sine excitation. The modal experiment on
the large space flexible truss structure was carried out using impulse excitation of half sine wave and from
which the natural frequencies and modals of the system were obtained. It is found that the experimental
result agrees well with the theoretical result, thus validating the correctness of theoretical calculating re
sult. The experimental result shows that using th