ADAPTIVE FLOW-RATE CONTROL OF A HYDRAULIC PROPORTIONAL VALVE

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > journal & Dissertation > Item 987654321/27132

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27132

Title:	ADAPTIVE FLOW-RATE CONTROL OF A HYDRAULIC PROPORTIONAL VALVE
Authors:	LAI,JY;CHEN,YR
Contributors:	機械工程學系
Keywords:	TIME-DELAY;SYSTEMS
Date:	1992
Issue Date:	2010-06-29 18:08:34 (UTC+8)
Publisher:	中央大學
Abstract:	The use of hydraulic proportional valves in industry is becoming increasingly popular as they have better performance than conventional on-off valves and lower cost than servovalves. However, due to significant time delay in valve dynamics, they are currently used for low-accuracy and low-dynamics applications. In this study, an adaptive self-tuning controller is proposed to enable a hydraulic proportional valve to achieve accurate set-point flow rate control. A moving model which reduces the system order and hence reduces the identification effort was used for the controller design. The controller is based on the pole-placement technique which shifts the dominant pole to the desired location. In addition, a predictor has been proposed to overcome the effect of the time delay. Experimental results have shown that the proposed self-tuning controller is better than the conventional PI controller as both transient oscillation and steady-state error shown in the PI control have been significantly reduced. Also, the performance of the closed-loop system is very robust as the system response remains the same under various operating conditions.
Relation:	JSME INTERNATIONAL JOURNAL SERIES III-VIBRATION CONTROL ENGINEERING ENGINEERING FOR INDUSTRY
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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