Unified Study on a Computer-Aided Maintenance System

(1)已成功地将Crosier方法和Healy方法两种累积和方法应用于含大量噪声变量的过程监测问题。(2)提出了一种组合算法，用于对可能导致致命事故的设备的预防性维护选择合理的周期和工种。(3)利用聚类和ICA技术，发展了几种检测污垢或腐蚀传播的新方法。为了支持间歇过程的安全设计，开发了一个支持间歇过程安全设计的风险评估系统，该系统根据事件的严重程度和频率给出定性的风险，并明确了间歇过程中可能发生的所有事故情景。(5)提出了一种利用签名有向图搜索多个故障源的算法。对该算法进行了改进，利用化工过程中状态变量之间的延迟信息，获得了令人满意的诊断结果。通过在催化裂化装置动态模拟器上的应用，验证了该算法的有效性。(6)开发了对策规划算法，当每个候选者找到共同的对策时，就可以恢复异常情况，从而完成故障诊断。开发了基于高阶统计量的工艺数据分析方法。(7)提出了一种确定计算机辅助维修系统部件作业合理分配的方法

(1) Two types of CUSUM method called Crosier Method and Healy Method have been successfully applied to process monitoring problems with a large number of noisy variables.(2) A combinatorial algorithm has been developed to select rationally periods and kinds of works for preventive maintenance of the equipment whose breakdown might give rise to a fatal accident.(3) Several novel methods to detect the propagation of fouling or corrosion have been developed by using clustering and ICA techniques. Synthesis of operating procedures to avoid faulty equipment is also considered.(4) A risk assessment system has been developed for supporting safety design of batch plants, which gives us qualitative risks based on the degree of severity and the frequency of events, as well as makes clear all accident scenarios that are likely to occur in batch processes.(5) An algorithm for searching multiple origins of failures by use of the signed digraph has been proposed. The algorithm has been improved so as to obtain diagnostic results of satisfactory accuracy using information about delays among state variables in a chemical process. The usefulness of this algorithm is demonstrated by its application to a Fluidized Catalytic Cracking Unit dynamic simulator.(6) Countermeasure planning algorithms has been developed to recover the abnormal situations in which fault diagnosis will be finished when a common countermeasure for each candidate can be found. Process data analysis based on high order statistics is also developed.(7) A method has been developed to determine rational allotment of component activities in a computer-aided maintenance system