STUDY ON A DISTRIBUTED FAULT DIAGNOSIS SYSTEM FOR CHEMICAL PLANTS

(1)提出了一种将目标对象划分为若干段的方法，使故障诊断不需要与其它段的信息交换。（2）建立了一个由模拟夹套反应器的管道和储罐组成的小型对象的带符号有向图，并利用该方法将其划分为若干段，设计了相应于各个段的分布式故障诊断系统。(3)通过对22种不同故障源的异常状态进行故障诊断实验，从诊断速度（B）、诊断结果的准确性（c）、诊断结果的可靠性等方面对分布式故障诊断系统的性能进行了检验，并对以下几种算法的性能进行了比较：（1）利用符号有向图的原始算法（2）利用加权符号有向图的算法（3）利用带条件分支的加权符号有向图的算法

(1) A method has been developed to divide a objective plant into seguments where fault diagnosis can be made without exchange of information on other segments(2) A signed digraph has been made for a mini-plant composed of pipelines and tanks simulating reactors with jacket and has been divided into segments by use of the above method.Distributed fault diagnosis systems have been designed corresponding to the individual segment.(3) The performances of the distributed fault diagnosis systems were examined from the view points :(a) speed of diagnosis(b) accuracy of diagnostic results(c) responsibility of diagnostic resultsby fault diagnosis experiments in 22 abnormal states from different origin of failures.Differences of performances by used algorithms were also examined for the following ones :(1) Original algorithm utilizing the signed digraph(2) Algorithm utilizing weighted signed digraph(3) Algorithm utilizing weighted signed digraph with conditional branches