控制回路中迟滞建模及在线检测  

Modeling and On-line Detection of Stiction in Control Loops

作　　者：王冲[1] 任正云[2] 

机构地区：[1]东华大学信息科学与技术学院,上海201620 [2]东华大学数字化纺织服装技术教育部工程研究中心,上海201620

出　　处：《计算机测量与控制》2009年第2期292-295,共4页Computer Measurement &Control

基　　金：国家自然科学基金资助项目(60674088)

摘　　要：控制阀门中非线性的存在,比如迟滞、死区等,限制了控制回路的性能;大约30%的控制回路振荡是由于阀门的问题,而迟滞是过程工业中所发现的最普遍的阀门问题;尽管已有很多对迟滞现象的理解和建模的尝试,但是仍然缺少一种简单、直观且能比较精确反映真实阀门特性的模型;着重研究阀门迟滞的机理并结合大量的事例,提出了迟滞的模型以及基于系统辨识的在线检测方法,仿真与实际工业应用表明了该方法的有效性与准确性。The presence of nonlinearities, such as stiction, and deadband in a control valve limits the control loop performance. About 30% of the control loops oscillation are due to valve problems, and stiction is the most commonly found valve problem in the process industry. In spite of many attempts to understand and model the stiction phenomena, there is a lack of a proper model, which can be understood and related directly to the practical situation as observed in real valves in the process industry. This study focuses on the understanding the mechanism that causes stietion, and proposes a model of stiction and an on--line detecting method of stiction based on system identification by a lot of examples, simulation and practical industrial applications show that this method is effective and accurate.

关 键 词：迟滞 建模 在线检测 控制回路 

分 类 号：TP271.72[自动化与计算机技术—检测技术与自动化装置]