A Modal Experimental Investigation of Hexahedron Flexible Multi-body Truss
Liu Shaokui, Yan Guirong, Ou Yangjun, Dong Longlei
(State Key Laboratory of Mechanical and Structural Strength and Vibration, Xi'an Jiaotong University, Xi'an, 710049)

Abstract: 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.
Keywords: space flexible truss, interior force vibration activating, modal experimental, natural frequency.