基于JSP的长虹SF2170E故障诊断专家系统

发布时间：2018-05-16 20:14

本文选题：故障树分析方法 + 电视机故障诊断　；参考：《西南交通大学》2014年硕士论文

【摘要】：故障树分析方法采用逻辑的方法,能够形象地进行故障的分析工作,即可以做定性的分析,也可以做定量的分析。使用故障树分析方法可以得到反映故障现象与引起该故障发生的所有可能元件之间的逻辑关系图,即故障树,可以清楚的看到系统的组成结构以及各个部件之间存在的因果关系。故障树分析方法是一种思路清晰、直观、逻辑性强的诊断方法,在众多领域得到了广泛应用,如数控机床系统、列车自动驾驶系统、汽轮发电机系统和汽车制动系统等。传统的电视机故障诊断需要人工对出故障的原因进行分析和判断,要求维修人员对电视机的结构有较为深入的认识,对从业人员的专业素质要求较高。随着电子技术的飞速发展,电视机所使用的技术越来越先进,结构也越来越复杂,可能引起电视机故障的原因也随之增多,故障的种类也越来越多样化,一般的维修人员很难跟上电视机技术的发展,只能依赖多年的维修经验对故障进行诊断,使得维修的效率和效果降低。本文研究把故障树分析方法应用于电视机故障诊断领域,研究如何使用故障树分析方法来辅助维修人员对电视机故障进行诊断。以长虹SF2170E电视机为例,开发了一款“长虹SF2170E故障诊断专家系统”,采用建立故障树的方式对主要故障现象进行逐层分析,找到相关的故障元件。本文重点对长虹SF2170E电视机系统中的开关电源故障进行了详细的讨论。开关电源故障会呈现五种不同的故障现象,首先对不同故障现象建立不同的故障树,然后把专家根据自己的理论和经验得到的各底事件发生故障的概率作为已知量,并对开关电源故障树进行定量分析,计算对应于不同的故障现象的各底事件的关键重要度,最后按照关键重要度对各相关故障元件进行从大到小的排序以确定检修顺序。
[Abstract]:The method of fault tree analysis adopts logical method, which can be used to analyze faults graphically, either qualitatively or quantitatively. Using the method of fault tree analysis, we can get the logical relation graph between the fault phenomenon and all the possible components that cause the fault, that is, the fault tree. We can clearly see the structure of the system and the causality between the components. Fault tree analysis is a kind of diagnosis method with clear, intuitive and strong logic. It has been widely used in many fields, such as CNC machine tool system, automatic train driving system, turbogenerator system and automobile braking system. The traditional fault diagnosis of TV sets needs to analyze and judge the causes of the faults manually. It requires the maintainers to have a deeper understanding of the structure of the TV set and the professional quality of the employees to be higher. With the rapid development of electronic technology, the technology used in TV is more and more advanced, and the structure is becoming more and more complicated. It is difficult for the general maintenance personnel to keep up with the development of television technology, so they can only rely on many years of maintenance experience to diagnose the failure, which reduces the efficiency and effect of maintenance. In this paper, the fault tree analysis method is applied to the field of TV fault diagnosis, and how to use the fault tree analysis method to assist the maintainers to diagnose the TV fault is studied in this paper. Taking Changhong SF2170E TV set as an example, a "Changhong SF2170E fault diagnosis expert system" is developed. The main fault phenomena are analyzed layer by building fault tree, and relevant fault components are found. In this paper, the fault of switching power supply in Changhong SF2170E TV system is discussed in detail. There are five different fault phenomena in switching power supply. Firstly, different fault tree is established for different fault phenomena, and then the probability of each bottom event that experts get according to their own theory and experience is taken as known quantity. The fault tree of switching power supply is quantitatively analyzed to calculate the critical importance degree of each bottom event corresponding to different fault phenomena. Finally, according to the critical importance degree, the relevant fault components are sorted from large to small in order to determine the repair order.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN949.12;TP277

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