In order to attenuate vibration on the impact of aircraft instrument, an active and passive hybrid vibration isolator by combining rubber and piezostack is proposed. An optimal control based on genetic algorithm is advised, and then the performance of the system is verified by experiment. After the model and equation of system are derived, the parameters of rubber and piezostack are experimentally identified, respectively. The vibration transmissibility is used as objective function and genetic algorithm is applied to optimize the parameters of velocity feedback. At the same time, the stability of control system is considered. Subsequently, the experimental platform is established and the performance is evaluated by experiment using optimal control. The experimental results verify the isolation performance is better than pure passive isolator, especially at resonant frequency.
Key words
vibration isolation /
piezostack actuator /
feedback control /
optimize
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