汽轮机故障树诊断方法研究及应用

采用故障树分析诊断汽轮机这个复杂系统的故障,利用模块连接法将复杂故障树转换为二元决策图(BDD),通过BDD进行故障树定性分析,解决复杂故障树定性分析时遇到的NP问题,以及常规故障树转换方式中的基本事件排序问题。通过对系统故障树的定性分析,求出所有最小割集;对系统故障树定量分析;结合汽轮机监测系统监测的故障信号与组成单元的状态进行匹配,从而确定故障诊断的顺序,从一定程度上避免发生概率小的最小割集优先诊断的情况,提高了系统诊断准确度,有助于精确诊断故障原因,节省诊断成本和优化系统诊断过程。针对某汽轮机打闸或跳闸时,主汽门关闭时间延长问题,应用故障树诊断方法成功的进行了故障诊断,为该方法今后的研究探索奠定基础。

Application of Maximum Probability Approach to the Fault Diagnosis of a Servo System

In an actual control system, it is often difficult to find out where the faults are if only based on the outside fault phenomena, acquired frequently from a fault system. So the fault diagnosis by outside fault phenomena is considered. Based on the theory of fuzzy recognition and fault diagnosis, this method only depends on experience and statistical data to set up fuzzy query relationship between the outside phenomena (fault characters) and the fault sources (fault patterns). From this relationship the most probable fault sources can be obtained, to attain the goal of quick diagnosis. Based on the above approach, the standard fuzzy relationship matrix is stored in the computer as a system database. And experiment data are given to show the fault diagnosis results. The important parameters can be on line sampled and analyzed, and when faults occur, faults can be found, the alarm is given and the controller output is regulated.

“健康中国”战略与我国体育保险发展研究

在＂健康中国＂战略下,我国体育产业和大健康产业迎来了新的发展机遇,同时对体育保险的需求也不断增加。体育保险的完善和发展对＂健康中国＂战略的实施至关重要,通过对比我国与世界发达国家的体育保险制度,寻找我国体育保险制度存在的问题,为尽快完善和发展我国体育保险提供参考。本文利用诊断树方法对我国体育保险发展进行分析。与发达国家相比,我国体育保险的发展存在缺乏法律保障、保险覆盖范围小、保险意识淡薄、险种单一和保险人才缺乏等问题。我国体育保险发展应该遵循五个控制柄理论,从筹资、支付、组织、规制和行为五个控制柄提出完善和发展我国体育保险的建议。