https://scholars.lib.ntu.edu.tw/handle/123456789/61407
標題: | Assessmentof controller performance: a relay feedback approach | 作者: | Thyagarajan, T. Yu, Cheng-Ching Huang, Hsiao-Ping |
關鍵字: | Relay feedback;Performance assessment;Monitoring;Autotuning;Intelligent control | 公開日期: | 2003 | 出版社: | Taipei:National Taiwan University Dept Chem Engn | 起(迄)頁: | 497-512 | 來源出版物: | Chemical Engineering Science 58(2) | 摘要: | Assessment of control loop performance is one of the important tasks to be carried out in a plant, regardless of the control strategy. The present work utilizes the shape information from single relay feedback test to assess the performance of a feedback system. The process considered is a typical 2rst-order plus dead time process and the controller used is PI type of controller. An ideal relay is introduced in the feedback loop before the controller. The shape of the relay output characterizes the performance of the controller. The mismatch in the integral time can also be observed from the shape. Based on the shape information, analytical expressions for relay feedback responses are derived and straightforward procedures are evolved to assess the performance of the controller. The proposed scheme assesses the controller performance and computes the new tuning parameters, in case retuning of the controller is necessary. The robustness of the method is also tested for second-order plus dead time as well as for higher order systems. More importantly the present approach employs only one relay test for (1) assessment and (2) retuning of the controller. It provides a reliable way that is compatible even to a non-expert operator to assess the controller performance. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/2006111501232996 | 其他識別: | 246246/2006111501232996 |
顯示於: | 化學工程學系 |
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