六面体柔性桁架多体结构的模态测试实验研究  

A Modal Experimental Investigation of Hexahedron Flexible Multi-body Truss

作　　者：刘绍奎[1] 闫桂荣[1] 欧阳军[1] 董龙雷[1] 

机构地区：[1]西安交通大学,西安710049

出　　处：《应用力学学报》2003年第2期45-48,共4页Chinese Journal of Applied Mechanics

基　　金：国家自然科学重点基金资助 (项目批准号 :5 0 13 5 0 3 0 )

摘　　要：采用半正弦冲击波形 ,通过内力激振的方法对六面体空间柔性桁架结构进行了模态实验研究 ,得到了系统的前四阶固有频率和模态振型。比较实验结果与理论计算结果 ,二者能够很好的吻合 ,验证了理论计算方法的正确性。实验结果表明采用内力激振的方法能够有效的激起结构的固有频率 ,所得的振动参数可为下一步空间柔性桁架振动主动控制提供直接依据。The modal experiment on the flexible space truss with the hexahedral structure is performed and investigated under the impulse excitation of haif sin wave by the method of interior force vibration activation. The first 4 order natural frequencies and modals of the system are obtained and compared with the theoretical results. The results of the experiment and theoretical computations are well fitted. This comparison shows that the dynamic mathematical model of space flexible multi body truss is right. The experiment indicates that the natural frequency of the truss examined in this paper can be triggered by the method of interior force vibration activating. The vibration parameters obtained by the experiment provides the basis for the further research on the vibration active control of the space flexible truss.

关 键 词：六面体柔性桁架多体结构 模态测试 实验研究 内力激振 固有频率 振动控制 结构动力学 

分 类 号：TU323.4[建筑科学—结构工程] TU311.3