MR Dampers Based Semi-active Fault Tolerant Control Of Structures Using H_∞Theory

Structural vibration control is a new type of seismic technology, including the semi-active control which is a control technology between passive control and active control. The semi-active control only needs a little extra energy, and can produce effect close to active control. Magneto rheological Damper is a kind of excellent semi-active control device, with the characteristic that active control device adjustable and passive control device reliable at the same time, which in vibration control field showed good and broad application prospects, with a great application value and engineering practical significance. Traditional control theory does not consider the potential fault threat in the control system, which can lead to the control system satisfied when the controlled system condition is normal, but the control system may collapse due to a little fault in the system. In order to improve the reliability and security of the vibration control system, it is imperative to implement fault-tolerant control.Based on the use of magneto rheological damper for structural vibration control, the following several aspects of the work are completed:(1)Material properties of magneto rheological fluid and several kinds of magneto rheological damper dynamics models are introduced, and MATLAB SUMULINK module is used to simulate and analyze the performance curves of magneto rheological damper dynamics models.(2) Based on H-infinity active control algorithm and Clipped-optimal semi-active control strategy, and simulation analysis is made on the semi-active control structure with magneto rheological damper. The calculation results show that based on the magnetic fluid damper the semi-active control system has good control effect.(3) For the sensor faults, the output residual of the observers group is used to diagnose the fault online, and through the comparison of the state values of several observers we could obtain the position of the fault. According to the position of the sensor fault to revise the measured value, and eliminate the influence of the fault on the closed-loop system, and finally achieve the semi-active H-infinity fault-tolerant control. The simulation results show that this method has a very excellent fault-tolerant control effect.(4) A H-infinity filter is designed which use linear matrix inequality (LMI) to diagnose the mistakes in the input signals; And then a H-infinity controller is designed, in order to make the objective function values keep the minimum in the disturbed and error signal interference, which could maintain the stability of the closed-loop system, and realize the fault-tolerant control. The simulation results verify the validity of this method.