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液压挖掘机故障诊断系统的方案设计和推理方法研究
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摘要
本论文通过对工程机械领域故障诊断的系统研究,提出了一种基于移动计算机巡检的在线检测和诊断的系统模型,并采用先进的嵌入式计算机技术进行了可行性试验探讨。通过深刻分析维修专家进行设备维修时的思路,采用基于故障树分析法的知识表示和模糊加权的推理机制实现了故障的定位,很大程度地减少了诊断过程的工作量,提高了诊断的准确性和效率,诊断过程具有一定的柔性自学习功能。
     第一章介绍了状态监测与故障诊断技术在国内外的现状、应用及发展趋势,分析了诊断领域的主要理论及研究内容,提出了本课题的研究内容,给出了全文的结构框架。
     第二章分析了挖掘机的功能结构和组成,对整个系统进行了解藕,详细介绍了多个子系统的典型故障现象的收集和具体的故障知识整理。分析比较了传统的故障诊断方法,并提出了整个系统的方案。
     第三章分析了嵌入式计算机技术在国内外的发展及其应用现状,论证了嵌入式计算机技术的特点和优势;介绍了嵌入式系统的结构等技术问题和开发环境;分析了将嵌入式系统引入工程领域的必要性、可行性和优越性。
     第四章和第五章详细阐述了基于故障树分析法的故障知识表示方法和模糊加权处理的推理机制,并以实例进行了说明。第五章中对Windows CE的开发机制和开发实现的几个主要的功能模块进行了详细的介绍。
     第六章总结了本课题的创新点和已经完成的工作,对课题接下来的发展方向和要解决的问题进行了展望,并对后续的工作做了分析,提出了几点建议。
Based on the systemic analysis of the configuration of the hydraulic excavator and the whole study of its fault diagnosis, this paper bring forward an on-line 3-layers fault diagnosis framework which is based on a circular-respecting system running on palm-size computer. And accomplished several important functions with the advanced technology - embedded system. Through deep analysis of the procedure of the maintenance man, we decided the method to express the field knowledge and the way to reason, which can reduce the work of the procedure and enhance the precision ant the veracity of the result to great extent. This paper can be divided into six chapters as follows:
    Chapter 1 summarized the history and the foreground of the fault diagnosis technology from the materials in domestic and abroad. At the last part of this chapter, it shows the framework of the whole paper.
    In chapter 2, Through analyzing the architecture of the excavator, we gave the collection and organization of the diagnosis and experience knowledge and the typical failures. Analyzing and comparing the basic methods used in the fault diagnosis field nowadays, we put foreword the architecture of the excavator fault diagnosis system.
    Chapter 3 introduces the embedded system technology in several aspects, such as the history, the character, the foreground and the application in domestic and broad relational field. At the end of this chapter, we demonstrate the applicable and the advantage of applying the embedded system into the engineering.
    Chapter 4 covers the details of the knowledge express and the fault reason. And several examples are offered to show it explicitly. Chapter 5 gave some introduction of the modules which have been completed.
    Chapter 6 summarizes the whole paper and gives some advice to point out the research focus of this title and its possible future.
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