Research On Active Vibration Suppression By Smart Materials For Structural Vibration

It is a hotspot in the current research that the appliance of smart structure in the field of structure vibration suppression. In this thesis, the application of positive position feedback technology in the control of multiple mode vibration of weapon pylon has been studied. Experimental results have shown that, multiple mode vibration of weapon pylon can be reduced, thereby, the shooting state of weapon pylon is improved effectively.The modal of the weapon pylon is developed by finite element analysis software. The parts of weapon pylon that mostly influence the shooting precision can be obtained by normal mode analysis. At the same time, the corresponding frequency response is obtained by the finite element modal analysis in order to know which frequency band influence the precision. According to these conclusions, an experimental active vibration control system is designed. The principle of positive position feedback method is studied and the optimization algorithm is described, which based on the pole-zero spacing in the system transfer function, and the relationship of the optimum parameters is presented. Simulation results show that not only the vibration can be suppressed successfully, but also the stability of the control system can be assured. The real-time control system is developed in the Simulink environment based the positive position feedback method. The experiments with the PPF showed that PPF method is able to reduce vibration of the weapon pylon excited by chirp and broadband noise.