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排序方式: 共有379条查询结果,搜索用时 15 毫秒
1.
Generalized difference control of parallel streams temperatures 总被引:1,自引:0,他引:1
A furnace with multiple parallel passes and multiple burners is commonly seen in petroleum refineries. In order to maintain the furnace running in a safe, stable, and high-efficiency state it is necessary to control the outlet temperatures of the multiple passes to be the same. Due to the fact that the process of the oil heating in such furnace is nonlinear, multivariable, time varying, has serious coupling among passes, has frequent dynamic changes and a large time delay, traditional control methods have trouble in controlling these temperatures, and some advanced control methods, including predictive control, adaptive control, and robust control, are usually too complex for convenient use. In this paper, a control technique, called differences control technique (DsCT), is proposed to distribute the stream flowrates such that the stream temperatures are as identical as possible. The principle of the proposed technique is explained and demonstrated, and the results of its application to a real-life petroleum refinery furnace are also reported. The DsCT technique has the following advantages: it does not need complicated design procedures, the controller structure is simple, it is easy to apply, and it can be canonically applied to furnaces with different number of passes. 相似文献
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针对二维直线电机系统中的直线电机本身存在的非线性以及XY两轴之间互相影响产生的耦合对控制精度的影响,提出了一种基于前馈结构的双神经网络解耦控制方法.根据二维直线电机两轴间的耦合结构和前馈控制结构,对应搭建了双神经网络模型,设计一种双神经网络的解耦控制策略,以消除二维直线电机两轴间的非线性强耦合对系统控制精度的影响.仿真结果表明:提出的双神经网络前馈解耦控制方法的有效性,并在起始阶段的跟踪方面表现出良好的性能. 相似文献
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Kok Yew Ng Chee Pin Tan Rini Akmeliawati Christopher Edwards 《Asian journal of control》2010,12(5):656-660
This paper investigates and presents conditions that guarantee disturbance decoupled fault reconstruction using sliding mode observers, which are less stringent than those of previous work, and show that disturbance reconstruction is not necessary. An aircraft model validates the ideas proposed in this paper. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
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针对多传感信息耦合问题,基于IEEE1451标准,提出了一种通用的多传感信息自校正模型。模型根据传感元件输出信号额定特征,从信号幅度、变化趋势等方面,实现对传感器的故障判断和自免疫处理;然后基于多传感信息插值解耦数学原理,建立了基于特定TEDS格式的校正引擎,通过将标定点数据以矩阵表格形式输入TEDS中来实现解耦校正。试验研究表明:通过TEDS解耦校正引擎,可实现对多传感耦合信息的良好校正补偿,提高检测准确度,在解耦校正的前端引入传感元件的自评估技术,可有效提高智能传感器自校正的可靠性。 相似文献
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A method of tuning for PI controllers with one-way lead/lag decoupling tuning is demonstrated for 2×2 input-output systems, based on finite frequency response data. The frequency response estimates are obtained from closed loop tests using an identification technique based on bandpass filters. The open-loop frequency response is calculated and used to tune PI controllers and to fit lead-lag compensators for decoupling by weighted least-squares. Separate optimization of the PI controllers and the lead-lag compensator is preferred. The tuning takes into account violations of desired multivariable robustness criteria. The method is illustrated by application to a paper machine headbox simulation and by experiments in distillation column temperature control. 相似文献
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A method for optimal control and filtering of multitime-scale linear singularly-perturbed stochastic systems 总被引:1,自引:0,他引:1
N. Prljaca Author Vitae 《Automatica》2008,44(8):2149-2156
In this paper we introduce a transformation for the exact closed-loop decomposition of the optimal Kalman filter and the linear quadratic optimal controller of multi time scale continuous-time, linear, singularly-perturbed stochastic systems. The solution of the corresponding algebraic regulator and filter Riccati equations are obtained in terms of solutions of reduced-order subsystem, algebraic, Riccati equations corresponding to the system time scales. We have also obtained N completely independent reduced-order subsystem Kalman filters working in parallel in different time scales. This allows parallel processing of information with lower-order, different rates Kalman filters consistent with the system time scales. 相似文献
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