Research On Active Control Of Flexible Vibration For Large Space Truss Structures

The characteristics of large space truss structures is relatively large size,light weight,structural damping is relatively weak,easy to produce flexible vibration attenuation can not in the actual work process,thus affecting the normal work of the spacecraft,the flexible vibration suppression is particularly important.The main research contents of this paper is aiming at the flexible vibration large space truss structure,simulation analysis based on finite element method,using active control method to suppress it.This thesis first introduces the research background,principle and dynamics of large space truss structures and flexible vibration are analyzed;analyzed the present situation of research on vibration suppression of flexible spacecraft structure,various vibration suppression methods are analyzed;the main dynamic will adopt flexible vibration control method to suppress the large space truss structures in the work in.Then,according to the technical requirements of the subject,the overall design of the corresponding system is given.Based on the overall design scheme is given in this paper,the vibration control of large space truss structures is studied.Firstly,the simplified model of the truss structure active control method;then the selected control scheme is applied to model the actual truss structure,this paper verified the feasibility o f the selected control scheme in the simulation process.Aiming at the shortcomings of the control results,the improvement and optimization of the control scheme.In order to evaluate the control effect of the selected scheme,several kinds of vibration c ontrol schemes were compared.At last,the thesis gives an overall design scheme of ground simulation experimental equipment.And the simulation model of truss experiment is simulated by using the control scheme selected in this thesis.