Study On The Semi-active Control Of Structural Vibration And Its Practicability

At present, It it has been proved by theory and experiment that structural control as a new technologythe semi-active control is a validthe most effective and economical method to reduce the seismic disaster. As one method in of the structural control, the semi-active control combines the active control and with the passive control, and it can approach to the control effectiveness of the active control with only little energy, this advantagewhich makes it the developmental tendency of the structural control. But with the strong nonlinear speciality, the semi-active control is not perfect in theory. Thus it is very important in theory and practice that the semi-active control technology of structural vibration and its application practicability are studied deeply.Following points are the achievement of my research:Based on single-step state predicting control law, AVS/D multi-modal switching control law for many degrees of freedomMDOF structural systems is presented.Put forward a tracking control algorithm based on LQG control theory for MR dampers to be applied in the structure vibration semi-active control field of structural vibration.Analyze the application development of Artificial Neural Network in the control field of structural vibration at firston structure vibration control field, and then a precise method of identifying to the structure system identifications based on BP Neural Network is suggested. Ploblems Problems about time-delay of the active or semi-active control systems are studied firstly, thenand then put forward two methods for time-delay compensation are introduced.Optimal placement of AVS/D control devices in the semi-active control system is discussed. Based on multi-modal optimal placement criterion, a method of optimal placement is given.Analyze the current practicabilityapplication problems of the semi-active control of structural vibration, based based on thesethe above ploblemsproblems, some future research directions are pointed out.