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铝电解槽浓度控制论域自调整的开发应用 被引量:3
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作者 农国武 《轻金属》 CSCD 北大核心 2004年第11期21-25,共5页
在大型铝电解槽生产过程中 ,被控对象铝电解槽的滞后性和控制鲁棒性差 ,无法用精确的数学模型来控制铝电解槽氧化铝浓度。如何利用槽表观电阻———氧化铝浓度特征曲线的动态变化规律 ,建立氧化铝浓度控制数学模型 ,选择最佳氧化铝浓度... 在大型铝电解槽生产过程中 ,被控对象铝电解槽的滞后性和控制鲁棒性差 ,无法用精确的数学模型来控制铝电解槽氧化铝浓度。如何利用槽表观电阻———氧化铝浓度特征曲线的动态变化规律 ,建立氧化铝浓度控制数学模型 ,选择最佳氧化铝浓度控制论域和控制策略 。 展开更多
关键词 控制论域 鲁棒性 表观电阻 按需下料 模糊子集 隶属度
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Fault tolerant control of electric pitch control system based on single current detection
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作者 李宏伟 付勃 +2 位作者 董海鹰 杨立霞 王睿敏 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2016年第1期63-70,共8页
In view of the current sensors failure in electric pitch system,a variable universe fuzzy fault tolerant control method of electric pitch control system based on single current detection is proposed.When there is sing... In view of the current sensors failure in electric pitch system,a variable universe fuzzy fault tolerant control method of electric pitch control system based on single current detection is proposed.When there is single or two-current sensor fault occurs,based on the proposed method the missing current information can be reconstructed by using direct current(DC)bus current sensor and the three-phase current can be updated in time within any two adjacent sampling periods,so as to ensure stability of the closed-loop system.And then the switchover and fault tolerant control of fault current sensor would be accomplished by fault diagnosis method based on adaptive threshold judgment.For the reconstructed signal error caused by the modulation method and the main control target of electric pitch system,a variable universe fuzzy control method is used in the speed loop,which can improve the anti-disturbance ability to load variation,and the robustness of fault tolerance system.The results show that the fault tolerant control method makes the variable pitch control system still has ideal control characteristics in case of sensor failure although part of the system performance is lost,thus the correctness of the proposed method is verified. 展开更多
关键词 electric pitch control fault tolerant control variable universe fuzzy control single current detection
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Distributed Role-based Access Control for Coaliagion Application
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作者 HONGFan ZHUXian XINGGuanglin 《Geo-Spatial Information Science》 2005年第2期138-143,共6页
Access control in multi-domain environments is one of the important questions of building coalition between domains. On the basis of RBAC access control model, the concepts of role delegation and role mapping are prop... Access control in multi-domain environments is one of the important questions of building coalition between domains. On the basis of RBAC access control model, the concepts of role delegation and role mapping are proposed, which support the third-party authorization. Then, a distributed RBAC model is presented. Finally the implementation issues are discussed. 展开更多
关键词 ROLE access control MULTI-DOMAIN DELEGATION MAPPING
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STABILIZATION OF THE QUADRUPLE INVERTED PENDULUM BY VARIABLE UNIVERSE ADAPTIVE FUZZY CONTROLLER BASED ON VARIABLE GAIN H_∞ REGULATOR 被引量:1
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作者 Yongli ZHANG Jiayin WANG Hongxing LI 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2012年第5期856-872,共17页
In this paper, the variable universe adaptive fuzzy controller based on variable gain Ha regulator (VGH∞R) is designed to stabilize a quadruple inverted pendulum. The VGH∞R is a novel robust gain-scheduling approa... In this paper, the variable universe adaptive fuzzy controller based on variable gain Ha regulator (VGH∞R) is designed to stabilize a quadruple inverted pendulum. The VGH∞R is a novel robust gain-scheduling approach. By utilizing VGH∞R technique, a more precise real-time feedback gain matrix, which is changing with states, is obtained, Via the variable gain matrix 10 state variables of quadruple inverted pendulum are transformed into a kind of synthesis error (E) and synthesis rate of change of error (EC) at sampling time. Therefore, the dimension of the multivariable system is reduced and the variable universe adaptive fuzzy controller is built. Experiments illustrate the effectiveness of the proposed control scheme. 展开更多
关键词 Quadruple inverted pendulum variable gain H∞ regulator (VGH∞R) variable universeadaptive fuzzy controller (VUAFC) algebraic Riccati equation (ARE).
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