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The paper describes how to model and control performance of a trusted web server using Feedback Error Learning and H∞ control theory. Web server load may experience enormous variations and unpredictability. Existing web servers are difficult to achieve performance guaranties in such environment. One of challenges in web server research is how to model non-linearity computing systems. We demonstrate...
This paper proposes a compensation scheme for both the time varying delay and the plant model uncertainty. As well known, time delay in feedback loop does not only weaken system performance, in worst-case situations it can cause system unstable. Conventional research treated the time varying delay as uncertain perturbation; however it restricts the performance of the system. In fact, the time delay...
Large-scale Generating Unit in heat power is a system which is complex nonlinear, multivariable, time-variant with long-time delay and difficult to establish accurate model, and etc. So it is hard to make system gain optimum running effect with conventional control strategy. A PID network which has dynamic character is used to identify the coordinated control system for establishing a predictive model...
This paper describes a control method which compensates two factors in a network based control system: one is a time-varying delay on a network communication and the other is a modeling error due to uncertainty of the plant. For the time-varying delay, we model it with an accurate modeling by measuring the individual time delays, and utilize them for the model-based compensator. Because the time delay...
In this paper, a design method of discrete modified Internal Model Control (IMC) with parallel feedforward compensator (PFC) is proposed. Introducing PFC and a predictor as a plant model, we designed a control system with superior performance. In the simulation study, it is shown that the proposed method has a superior performance in a load disturbance response and robustness compared with the conventional...
It is known that the PID controller is ill-suited to handle time-delay processes, especially in applications with stringent control objectives to be met. For such purposes, deadtime compensators may be used. But such controllers still face resistance towards actual industrial applications due to their difficulties in implementation and realisation. In this paper, a PID solution involving setpoint...
Considering the characteristics of time delay, time variables and variable operation condition in process control system, The partial models are built based on the different operating points integrating fuzzy membership function with weighted sums to improve the traditional internal model control(IMC), and the fuzzy membership functions are obtained by recursion identification method. Then multiple...
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