Abstract
In order to realize simple, reliable, low power consumption and high efficient broad-frequency micro-vibration isolation, a new vibration isolation system was set up by using the pneumatic artificial muscle (PAM) and the negative stiffness element, and active and passive control for the vibration isolation system were discussed. Firstly, the dynamics model of the vibration isolation system were built, the quasi-zero stiffness characteristics was analyzed, and the vibration transmissibility, response and nonlinear phenomena were analyzed by using the approximate analytical method and numerical method. And then, the low-frequency active control strategy for the vibration isolation system was developed by using backstepping control method and adaptive control technology and sliding mode control technology, and the vibration isolation performance under the active control was analyzed by using numerical method. The results show that the vibration isolation system widens the frequency band of low-frequency vibration isolation, the vibration isolation frequency can be lowered to 0.033Hz for the harmonic excitation whose amplitude is less than 5mm, and low power consumption and high precision vibration isolation can be realized by using the active control method, for this reason, simple, reliable, low power consumption and high efficient broad-frequency micro-vibration isolation can be realized by combining the passive control with the active control.
Key words
broad-frequency vibration isolation /
pneumatic artificial muscle /
negative stiffness element /
active control
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LIU Yan-bin;HAN Xiu-ying;MA Jia-jia;YIN Chen-xu.
Research on Active and Passive Broad-frequency Vibration Isolation Based on PAM and Negative Stiffness Element[J]. Journal of Vibration and Shock, 2014, 33(24): 179-186
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