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Full-Text Articles in Engineering
Application Of Fuzzy Pid Control Based On Neutral Network On High/Low Temperature Environmental Simulation System, Jingwang Jiang, Yunjie Wu, Mengchen Wu
Application Of Fuzzy Pid Control Based On Neutral Network On High/Low Temperature Environmental Simulation System, Jingwang Jiang, Yunjie Wu, Mengchen Wu
Journal of System Simulation
Abstract: High/Low Temperature Environmental Simulation System is mainly used for the functional deploying test of the giant space deployable antenna and some large-scale structures at extreme high/low temperatures, and some other relevant tests. This project requests controlling the parameters of the system in a large range with high accuracy and no overshoot. Temperature control system has features of non-linearity, time-variant, and large delay, which seriously affect the speed and accuracy of the control. However, the conventional PID finds it difficult to achieve desired effect of control. A new scheme of compound control which is referred to as fuzzy-PID control based …
Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor, Xiaoyi Lü, Wang Yan, Zhicheng Ji, Dahu Yan
Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor, Xiaoyi Lü, Wang Yan, Zhicheng Ji, Dahu Yan
Journal of System Simulation
Abstract: With the aim of improving the performance of the vector controlled induction motor system, a novel control method which combines variable structure PID speed control with online identification of rotor resistance based on model reference adaptive system (MRAS) is proposed. The rotor resistance is identified by self-adaptive adjustment in the model reference adaptive system based on the instantaneous reactive power. Given that the parameters can not change on line and the integral saturation phenomenon often exists in traditional PID speed regulator, a variable structure PID speed controller is designed by integrating anti-windup technology with fuzzy theory based on traditional …
Demand Forecasting Of Wartime Spares Based On Evidence Theory, Yunjing Zhang, Xinxin Wang, Wang Yang, Guangming Tang
Demand Forecasting Of Wartime Spares Based On Evidence Theory, Yunjing Zhang, Xinxin Wang, Wang Yang, Guangming Tang
Journal of System Simulation
Abstract: A new method based on evidence theory is proposed to solve the lack of data for the demand prediction of spares in wartime. Utilizing Markov chain model to research the rule of spares demand of peacetime from the historical data. A Markov chain transfer probability adjustment strategy, based on the change of combat intensity, is designed, which can be used to simulation the rule of spares demand in wartime. Under the experience of experts and the combination of the Fuzzy theory and evidence theory, the spares demand is wartime is forecasted. The simulation example shows that the …