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ABSTRACT: In practical electro-pneumatic or hydraulic servo mechanism, there is usually an unavoidable operating delay time in the solenoid
valves. This may sometimes cause closed-loop instability if the time delay is not treated carefully in the control system
designs. Furthermore, pneumatic actuators can offer high performance at low cost, but are often suffered from external disturbances
depending on the operating conditions. This paper proposes a non-model-based design approach for pneumatic actuating systems.
In the proposed control system, a gain scheduled fuzzy-PID controller ensures tracking performance an adaptable wavelet neuro
compensator compensates for time-delay of the control valve, and a disturbance rejecter diminishes influence from load changes.
A condition ensuring the closed-loop stability is derived. The proposed design is experimentally verified to show its effectiveness.
Journal of Intelligent Manufacturing 04/2012; 19(4):407-419. · 0.86 Impact Factor
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ABSTRACT: This paper is concerned with the design problem of the robust control for a networked control system (NCS) with time-varying communication delays. It has been known that time delays may not only degrade the system performance, but also destabilize the controlled plant. To alleviate the influence resulting from time delays while maintaining performance, a mixed fuzzy-PID/neural network compensating scheme is applied to pneumatic systems with uncertain communication delay. The experimental results verify effectiveness and superiority of our proposed approach.
Conference on Computational Intelligence and Multimedia Applications, 2007. International Conference on; 01/2008
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ABSTRACT: The purpose of this paper is to present a stable network control design with uncertain time-varying communication delays. In the typical networked control systems (NCSs), there are inherent plant delays and network delays. It has been know that time delays may not only degrade the system performance, but also destabilize the controlled plant. To alleviate the influence resulting from time delays while maintaining performance, we propose a compensating scheme which consists of two compensators-a fuzzy-PID controller and a neuron network compensator. The proposed design has also been experimentally verified to show its effectiveness and superiority.
Control and Automation, 2007. ICCA 2007. IEEE International Conference on; 07/2007
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ABSTRACT: A robust Smith predictor is proposed to compensate for the round trip delay of networked control systems (NCSs); An analytical TCP model is adopted. We show that stability of the closed-loop system is guaranteed up to some maximum upper bound of the round trip delay
IEEE Communications Letters 04/2007; · 0.98 Impact Factor
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ABSTRACT: Operating delay time in the solenoid valves is common in the practical electro-hydraulic servo systems. This may sometimes cause closed-loop instability if it wasn't treated carefully in the control system designs. We propose a non-model-based design approach for hydraulic actuating systems based on a new time-delay compensation scheme. In the proposed system, two types of controllers are combined; one is a fuzzy-PID controller used to ensure tracking performance, the other one is an adaptable wavelet compensator used to compensate for the time delay resulting from the control valve. Performance of the proposed design is widely verified on a newly developed simulation platform to show its effectiveness.
Industrial Electronics, 2004 IEEE International Symposium on; 06/2004
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American Control Conference, 2003. Proceedings of the 2003; 02/2003
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ABSTRACT: Building a real-time (RT) control network using standard TCP/IP and Ethernet is often difficult, because the communication protocols usually have unpredictable time delays. When RT packets are transported within an ordinary Ethernet network, there may be a significant time delay before receiving them. This sometimes causes loop instability and performance degradation. A compensation scheme that consists of a fuzzy-PID controller and a neural network compensator is proposed here. This diminishes the influence from time delays on stability while maintaining the system performance. The proposed design is experimentally verified in the real-world network environment to show its effectiveness and applicability.
Control Engineering Practice.
