Study on the dynamic characteristics of the coupling feedback controlling vibration system with delay

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (18) : 177-183.

Liu Shuyong1,Wei Xiulei2,Fang Xuan1,Wang Ji1,Su Pan1

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Abstract

The double stage coupling feedback digital vibration controlling system model is presented to analyze the dynamic characteristic of the corresponding system with time delay. The coupling relation between actuators are described through the signal transmit block diagram, and it overcomes the disadvantages of the traditional method without reaction force on foundation. The discrete domain equation of the force transmissibility under coupling feedback control strategy is derived. The step response of the system with different sampling time, damping and feedback type are calculated. Results show that the digital controlling system response approaches to the original one with small sampling time, and it is unstable with long delay time, the corresponding poles lie at the outside of the unit circle. The lead compensator is designed to improve the controlling effectively.

Key words

vibration system / feedback delay / coupling control；delay compensation

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Liu Shuyong1,Wei Xiulei2,Fang Xuan1,Wang Ji1,Su Pan1. Study on the dynamic characteristics of the coupling feedback controlling vibration system with delay[J]. Journal of Vibration and Shock, 2017, 36(18): 177-183

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