Improvement of Roller Running System Based on Closed-loop Control

ZHU Wu-wei, LI Yu, FENG Zhong-xu, ZHANG Xiao-bo, YAO Yun-shi

China Journal of Highway and Transport ›› 2017, Vol. 30 ›› Issue (5) : 152-158.

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China Journal of Highway and Transport ›› 2017, Vol. 30 ›› Issue (5) : 152-158.

Improvement of Roller Running System Based on Closed-loop Control

  • ZHU Wu-wei1,2, LI Yu3, FENG Zhong-xu1,2, ZHANG Xiao-bo1,2, YAO Yun-shi1,2
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Abstract

In order to investigate the improvement of the closed-loop control on the roller speed stability, theoretical analysis and simulation were combined to analyze the running system of the roller. The transfer function model was established by the diagram of hydraulic driving system of double-drum roller and the characteristics of hydraulic components.And transfer function relationships between the control signals and running speed response, running load and running speed response were derived. Then the traditional transfer function model of the roller running system was improved by combining closed-loop PID control characteristics, namely, proportion, integral and differentiation with the result of the present transfer function model under closed-loop control. Running tests on the 12 t double-drum roller were carried out on the basis of the theoretical derivation. After time-domain comparison and frequency-domain comparison of simulated and practical velocity curves, the simulation analysis was done to explore the effect of closed-loop PID control on the characteristics of running system. The results show that the simulation model can present the changing rule of running speed exactly under the load of fluctuation. With the PID control, the velocity stability during the roller running process is improved on the basis of invariability of the average value of the velocity. The super harmonic oscillation in the system step response has been significantly suppressed. The stability time has been improved and the response of the system is more accurate. Thus the closed-loop control applied to roller running system can improve the velocity stability under the process of smooth and steady operation of roller and the compaction quality.

Key words

mechanical engineering / roller / transfer function / closed-loop PID control / speed stability / step response

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ZHU Wu-wei, LI Yu, FENG Zhong-xu, ZHANG Xiao-bo, YAO Yun-shi. Improvement of Roller Running System Based on Closed-loop Control[J]. China Journal of Highway and Transport, 2017, 30(5): 152-158

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