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Tracking Control using Disturbance Observer and ZPETC on LonWorks/IP Virtual Device Network  

Song, Ki-Won (Division of Electonics & Information Engineering, Cheongju University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.44, no.1, 2007 , pp. 33-39 More about this Journal
Abstract
LonWorks over IP (LonWorks/IP) virtual device network (VDN) is an integrated form of LonWorks device network and IP data network. LonWorks/IP VDN can offer ubiquitous access to the information on the factory floor and make it possible for the predictive and preventive maintenance on the factory floor. Timely response is inevitable for predictive and preventive maintenance on the factory floor under the real-time distributed control. The network induced uncertain time delay deteriorates the performance and stability of the real-time distributed control system on LonWorks/IP virtual device network. Therefore, in order to guarantee the stability and to improve the performance of the networked distributed control system the time-varying uncertain time delay needs to be compensated for. In this paper, under the real-time distributed control on LonWorks/IP VDN with uncertain time delay, a control scheme based on disturbance observer and ZPETC(Zero Phase Error Tracking Controller) phase lag compensator is proposed and tested through computer simulation. The result of the proposed control is compared with that of internal model controller (IMC) based on Smith predictor and disturbance observer. It is shown that the proposed control scheme is disturbance and noise tolerant and can significantly improve the stability and the tracking performance of the periodic reference. Therefore, the proposed control scheme is well suited for the distributed servo control for predictive maintenance on LonWorks/IP-based virtual device network with time-varying delay.
Keywords
LonWorks/IP Virtual Device Network(VDN); time delay; disturbance observer; Zero Phase Error Tracking Controller(ZPETC); Internal Model Controller(IMC);
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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