首页 >知识讲堂 > 英文资料文献 > 详细内容
Rule-based Reactor Control
技术分类:过程与先进控制 发表时间:2005-12-05
rator input the target value for temperature?
  • How is the response of the system tuned?
  • How does the operator take manual control of the signal to the valve?
    • A complete solution can require hundreds of such rules to cover all possible situations it may encounter AND all functions that will be required. In any case, a rule-based system executes the entire rule set at periodic intervals to determine what is to be done next.

       

      In general, rule-based systems can be divided into two broad cat

      egories: fuzzy logic systems and expert systems. Both approaches provide a means to incorporate non-mathematical concepts and conditions into a control solution. Fuzzy logic systems are a hybrid of mathematical and non-mathematical concepts. Expert systems are almost always developed in an environment designed for language processing.

       

      There are many good references on the details and techniques of fuzzy logic control and expert systems. The following link provides a listing of general sources of fuzzy information and research groups: http://www.cse.dmu.ac.uk/~rij/general.html.

       

      Fuzzy logic concepts

      Very often, human perceptions and judgments are not precise. A typical human thought might be a conditional statement such as:

       

      'If the product temperature is low, and throughput is low, then open the steam valve a small amount. If the product temperature is low and the throughput is high, then open the valve a larger amount.'

       

      Such a statement contains several imprecise concepts,¡ªfor example, 'low' and 'large,' which become precise for humans through experience. Fuzzy logic is the approach that has been developed to use this kind of rule in process control systems that do not have the benefit of experience.

       

      Changing constants is one way to fine tune fuzzy logic control system performance.

       

      In the end, something specific has to be done. The basic contribution of fuzzy logic techniques is to integrate fuzzy decision concep

      1】【2】【3】【4】【5】【6】【7
      您可能感兴趣的文章
        最新文章
          此文涉及的厂商信息
            相关作者文章
              相关厂商
                热门文章
                  CEC博客