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个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职:Professor at the Institute of Advanced Measurement & Control Technology
其他任职:先进检测与控制技术研究所所长
性别:男
毕业院校:上海交通大学
学位:博士
所在单位:控制科学与工程学院
学科:控制理论与控制工程. 化学工程
办公地点:大连理工大学控制科学与工程学院先进检测与控制技术研究所
大连市凌工路2号大连理工大学海山楼A座724室
联系方式:Tel:(0411)84706465 实验室网站:http://act.dlut.edu.cn/
电子邮箱:tliu@dlut.edu.cn
Closed-loop step identification of low-order continuous-time process model with time delay for enhanced controller autotuning
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论文类型:期刊论文
发表时间:2012-01-01
发表刊物:International Journal of Systems, Control and Communications
收录刊物:Scopus
卷号:4
期号:4
页面范围:225-249
ISSN号:17559340
摘要:A continuous-time model identification method is proposed based on a closed-loop step response test for obtaining a low-order process model to facilitate control design in industrial engineering practices. By introducing a damping factor to the closed-loop step response for realisation of the Laplace transform, a frequency response estimation algorithm is developed in terms of the closed-loop system configuration used for identification. Correspondingly, two model identification algorithms for obtaining the widely used low-order process models of first-order-plus-dead-time (FOPDT) and second-order-plus-dead- time (SOPDT) are derived analytically respectively. To improve model fitting accuracy over a specified frequency range interested to controller tuning, in particular for identification of a higher order process, another identification algorithm is given based on weighted least-squares fitting of the process frequency response points estimated in the specified frequency range. Using the identified low-order models, a model-based controller design and tuning method is proposed for improving load disturbance rejection. Illustrative examples from the recent literature are used to demonstrate the effectiveness and merits of the proposed identification algorithms and controller tuning method. Copyright ? 2012 Inderscience Enterprises Ltd.