外文翻譯----嵌入于可編程邏輯控制器的先進算法

1、外文文獻翻譯Advanced control algorithms embedded in a programmableAbstractThis paper presents an innovative self-tuning nonlinear controller ASPECT (advanced control algorithms for programmable logic controllers). It is inten

2、ded for the control of highly nonlinear processes whose properties change radically over its range of operation, and includes three advanced control algorithms. It is designed using the concepts of agent-based systems,

3、applied with the aim of automating some of the configuration tasks. The process is represented by a set of low-order local linear models whose parameters are identified using an online learning procedure. This procedure

4、 combines model identification with pre- and post identification steps to provide reliable operation. The controller monitors and evaluates the control performance of the closed-loop system. The controller was implement

5、ed on a programmable logic controller (PLC). The performance is illustrated on a field test application for control of pressure on a hydraulic valve’s 2005 Elsevier Ltd. All rights reserved.Keywords: Control engineering

6、; Fuzzy modelling; Industrial control; Model-based control; Nonlinear control; Programmable logic controllers; Self tuning regulators 1. IntroductionModern control theory offers many control methods to achieve more effic

7、ient control of nonlinear processes than provided by conventional linear methods, taking advantage of more accurate process models (Bequette, 1991; Henson Murray-Smith Seborg, 1999) indicate that while there is a con

8、siderable and growing market for advanced controllers, relatively few vendors offer turn-key products. Excellent results of advanced control concepts, based on fuzzy parameter scheduling (Tan, Hang, Babusˇ ka, Oosterho

9、ff, Oudshoorn, Gundala, Hoo, Ha¨ gland Section 3 gives a brief description of the CT; and finally, Section 4 describes the application of the controller to a pilot plant where it is used for control of the press

10、ure difference on a hydraulic valve in a valve test apparatus. 2. Run-Time ModuleThe RTM of the ASPECT controller comprises a set of modules, linked in the form of a multi-agent system. Fig. 1 shows an overview of the RT

11、M and its main modules: the signal pre-processing agent (SPA), the online learning agent (OLA), the model information agent (MIA), the control algorithm agent (CAA), the control performance monitor (CPM), and the operat

12、ion supervisor (OS).2.1. Multi-faceted model (MFM)The ASPECT controller is based on the multi-faceted model concept proposed by Stephanopoulus, Henning, and Leone (1990) and incorporates several model forms required by t

13、he CAA and the OLA. Specifically, the MFM includes a set of local first- and second-order discrete-time linear models with time delay and offset, which are specified by a given scheduling variable s(k).The model equatio