Research On Active Vibration Control Of Beam Under Moving Mass

Based on the key beforehand project of the "tenth five-year", the research isdeveloped and aims at the new concept arms------flexible smart composite barrel. Thedynamic response and active vibration control of beam under moving mass are studied in this dissertation. After analyzing the vibration characteristics of the flexible composite barrel, the active vibration control technology is introduced to suppress its vibration. Combining theoretical modeling and experimental developing, some key problems of applying the active vibration control technology to vibration control of flexible composite barrel are discussed, which provides the technology foundation for later developing of flexible smart composite barrel. The coupling vibration model between the moving projectile and flexible composite barrel is established and solved by applying numerical iterative method and simulation experimental study, and many valuable conclusions are made.In order to obtain sensing signal totally, the least mean square (LMS) adaptive filtering method and two-weight least mean square (TWLMS) one are applied to the dynamic balance signal separation between piezoelectric self-sensing actuator sensing signal and excitation signal. The signal separating and adjusting circuits are also designed.In this dissertation the flexible composite barrel is simplified as a cantilever beam. Based on Euler-Bernoulli beam theory and mode theory, the transfer function between the control voltage and mode response is derived to model the flexible beam bonded with piezoelectric sensors and actuators, and the state space model of cantilever beam for active vibration control under moving mass is established. According to the energy principle, an index has been developed for placement of piezoelectric self-sensing actuator for control of vibration of a flexible cantilever beam under short lived and lasting disturbance of moving mass. Application of the adapting fuzzy control method for vibration of beam under moving mass by self-sensing actuator has been proposed.The self-sensing signal separating system and real-time measuring and controlling system for active vibration control are developed based on digital signal processor TMS320LF2407, TMS320VC33 and PC. The experiment for active vibration control of cantilever beam under moving mass is carried out by using smart piezoelectric material as self-sensing actuator. Comparison of theoretical model and experimental results shows good agreement for signal separating, placement of piezoelectric self-sensing actuator and...