In this thesis , the dynamic models of a specific precise instrument in spacecraft are established and an active vibration isolation system based on piezoelectric intelligent structures is constructed . theoretical analysis and numerical simulation on this system has been carried out . piezoelectric intelligent structure is applied to civil engineering . the piezoelectric intelligent control devise is used for the control of translation - torsion coupling responses of multi - story frame structure suffered from earthquake
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The major work is as follows : 1 ) based on dry hull modal analysis of flexure - torsion coupling vibration of unsymmetrical ship structures about longitudinal centerline , a transfer matrix method to calculate the dynamic characteristics is adopted after the parameters of structures are specified . taken both shear effect and warping deformations into account , the point and field transfer matrices are derived , and the influence on dynamic characteristics is computed according to different damaged positions and areas
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In order to investigate the seismic torsional response of base - isolated structures with frame - shear walls , the lateral - torsion coupling vibration model and the corresponding motion equation are formulated for the high - storey structure with frame - shear wall and isolated foundation under seismic action
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( 5 ) the piezoelectric intelligent control devise is used for the control of translation - torsion coupling responses of multi - story frame structure which is suffered from earthquake . the results of an example illustrate that this intelligent control devise can effeiciently reduce the structual translation - torsion coupling responses induced by earthquake
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Finally , as compared the translation - torsion coupling seismic response of asymmetric high - rise building subjected to bi - directional with unidirectional earthquake motions , the results illustrate that the aseismic capacity of structure in the case of bi - directional earthquake is worse , which accords with the conclusion that code for seismic design of building emphasizes
