摘要：Uncertainty is inherent and unavoidable in almost all engineering systems. It is of essential significance to deal with uncertainties by means of reliability approach and to achieve a reasonable balance between reliability against uncertainties and system performance in the control design of uncertain systems. Nevertheless, reliability methods which can be used directly for analysis and synthesis of active control of structures in the presence of uncertainties remain to be developed, especially in non-probabilistic uncertainty situations. In the present paper, the issue of vibration con- trol of uncertain structures using linear quadratic regulator （LQR） approach is studied from the viewpoint of reliabil- ity. An efficient non-probabilistic robust reliability method for LQR-based static output feedback robust control of un- certain structures is presented by treating bounded uncertain parameters as interval variables. The optimal vibration con- troller design for uncertain structures is carried out by solv- ing a robust reliability-based optimization problem with the objective to minimize the quadratic performance index. The controller obtained may possess optimum performance un- der the condition that the controlled structure is robustly re- liable with respect to admissible uncertainties. The proposed method provides an essential basis for achieving a balance between robustness and performance in controller design ot uncertain structures. The presented formulations are in the framework of linear matrix inequality and can be carried out conveniently. Two numerical examples are provided to illustrate the effectiveness and feasibility of the present method.

摘要：The 3rd generation synchrotron light source requires high level of electron beam orbit *** Synchrotron Radiation Facility (SSRF) is a 3rd generation light source under construction;its orbit stability requirement is up to micro or sub-micro *** storage ring mechanical components vibration caused by the ground motion would influence the orbit *** ground motion of SSRF is *** is essential to control the vibration of the mechanical *** damping is an effective method to control the *** author designed a vibration damping structure for the SSRF mechanical *** test results show that it can effectively control the mechanical vibration.

摘要：Due to obvious advantages,such as light weight,easy folding and deployment and high accuracy of optical imaging,the membrane diffraction large space telescope has currently been one of the hot research *** of the influence of external disturbance and attitude adjustment,the large space telescope will occur a certain degree of vibration inevitably,affecting the imaging accuracy of the space telescope for ***,to satisfy the requirement of imaging accuracy,it is necessary for the space telescope to adopt appropriate vibration control *** this paper,the active vibration control of the large space telescope is studied using cables as active *** that cables can work under tension but not under pression and the tensile capacity is limited,the unilateral and saturated characteristics of cable actuators are taken into account during control design in this ***,the dynamic model of the membrane diffraction space telescope is established using the finite element method(FEM).Secondly,in combination with the linear quadratic regulator(LQR)and the bang-bang regulator,a piecewise cost function is used to design the active vibration control ***,the controllability criterion and the genetic algorithm(GA)are adopted to determine the optimal positions of cable ***,the validity of the proposed control method is verified by numerical *** results indicate that the vibration of the space telescope can be suppressed effectively using the proposed control method,and the imaging requirements of the telescope may be realized using the least cable actuators,whose minimum quantity and position distribution are determined in this paper.

摘要：Traveling wave piezoelectric beam actuators(TWPBAs)present an advantageous structural configuration for self-moving actuators and hold significant promise for operation in confined ***,current research on TWPBAs faces several limitations,including deficient design methods of excitation and structural parameters,inadequate evaluation metrics,and lack of a quantitative relationship between these parameters and evaluation *** study presents a systematic approach to determining TWPBAs'structure and excitation parameters,proposes criteria for determining the excitation parameters through an established analytical model,and introduces an effective evaluation method for TWPBAs'*** the analytical model and evaluation metrics,we reveal:(1)the coupling relationship between excitation parameters and structural parameters,(2)the influence of participating mode pairs on vibration response,(3)the quantitative relationship between the evaluation metrics and excitation parameters is also *** conclusions are substantiated by the results of finite element analysis,laser vibration measurements,and motion test ***,the practical application of TWPBAs in pipeline operations underscores their potential for use in endoscopy and precision instruments.

摘要：The optimal design and effectiveness of three control systems,tuned viscous mass damper(TVMD),tuned inerter damper(TID)and tuned mass damper(TMD),on mitigating the seismic responses of base isolated structures,were systematically ***,the seismic responses of the base isolated structure with each control system under white noise excitation were ***,the structural parameter optimizations of the TVMD,TID and TMD were conducted by using three different *** results show that the three control systems were all effective in minimizing the root mean square value of seismic responses,including the base shear of the BIS,the absolute acceleration of structural SDOF,and the relative displacement between the base isolation floor and the ***,considering the superstructure as a structural MDOF,a series of time history analyses were performed to investigate the effectiveness and activation sensitivity of the three control systems under far field and near fault seismic *** results show that the effectiveness of TID and TMD with optimized parameters on mitigating the seismic responses of base isolated structures increased as the mass ratio increases,and the effectiveness of TID was always better than TMD with the same mass *** TVMD with a lower mass ratio was more efficient in reducing the seismic response than the TID and ***,the TVMD,when compared with TMD and TID,had better activation sensitivity and a smaller stroke.