电子部件检测及故障诊断系统设计与实现

发布时间：2018-04-20 19:49

本文选题：光电雷达 + 电子部件　；参考：《南京航空航天大学》2016年硕士论文

【摘要】：机载光电雷达是战机飞行及实战中必不可少的设备,电子部件是光电雷达的核心部件,主要负责接收主计算机传来的指令并控制光电雷达进入不同的状态。本文针对电子部件检修中故障搜寻困难及工作量大的问题,设计了一套以Windows为平台VC++为开发工具的电子部件检测及故障诊断系统。论文首先介绍了故障树的基本概念,重点介绍了故障树的分析法,对故障树分析法中的故障树的建立、故障树的定性和定量分析、底事件模糊失效率的求解等进行了详细的研究。为电子部件的故障树分析提供了理论基础。论文根据电子部件的组成原理及系统的主要功能和设计要求,提出了电子部件检测及故障诊断系统的设计方案,设计并实现了检测系统的硬件架构。对系统硬件组成中频率产生电路、展波电路、ARINC429电平转换电路等主要模块的设计进行了详细论述。文中设计了电子部件中主要模块的检测方案,对检测系统的软件整体结构以及压-码检测模块、码-压检测模块、脉码检测模块、匹配检测模块、只读存储器模块、故障元器件定位模块、自检模块等主要检测模块做了详细的阐述。针对传统的模块连接法计算量大和运行的空间过大的问题,论文提出将故障树进行预处理,利用压缩原则和提取原则将故障树大大的简化,将简化之后的故障树进行模块化,使得可以对故障树分块处理。最后用节点化简法来转换为BDD,提高了转换的效率避免了转换中带来的大量运算。以电子部件检测及故障诊断系统为研究对象,全面分析了各模块在逻辑上的结构关系,以此为基础建立了故障树。基于电子部件各模块底事件失效率难以获取的情况,将模糊集理论引入到故障树分析中,利用权重专家的模糊评判来求取底事件失效率,对故障树进行定性及定量分析求出了重要度,为设备的故障诊断提供了技术参考。最后对所设计的电子部件检测及故障诊断系统完成了软件和硬件的联调测试,测试结果证明了系统的性能优越,达到了预期的目标,满足了各项指标以及功能要求。目前检测系统已投入使用,具有很高的实用价值。
[Abstract]:Airborne photoelectric radar is the essential equipment in fighter plane flight and actual combat. Electronic component is the core part of photoelectric radar. It is mainly responsible for receiving the instruction from the main computer and controlling the photoelectric radar to enter different states. Aiming at the difficulty of fault searching and heavy workload in the maintenance of electronic components, a set of electronic component detection and fault diagnosis system based on Windows platform VC is designed in this paper. In this paper, the basic concept of fault tree is introduced, and the analysis method of fault tree is emphasized. The establishment of fault tree in fault tree analysis, the qualitative and quantitative analysis of fault tree are introduced. The solution of fuzzy failure rate of bottom event is studied in detail. It provides a theoretical basis for fault tree analysis of electronic components. According to the composing principle of electronic components and the main functions and design requirements of the system, this paper puts forward the design scheme of the electronic component detection and fault diagnosis system, and designs and implements the hardware structure of the detection system. The design of frequency generation circuit and ARINC429 level conversion circuit are discussed in detail. In this paper, the detection scheme of the main modules in electronic components is designed. The whole software structure of the detection system, the detection module of pressure-code, the module of code-voltage detection, the module of pulse code detection, the module of matching detection and the module of read-only memory are designed. Fault component location module, self-test module and other main detection modules are described in detail. In order to solve the problems of the traditional modular connection method, the paper proposes to preprocess the fault tree, simplify the fault tree by the principle of compression and extraction, and modularize the simplified fault tree. This makes it possible to block the fault tree. Finally, the node simplification method is used to convert to BDD, which improves the efficiency of conversion and avoids a lot of operation. Taking the electronic component detection and fault diagnosis system as the research object, the logical structure relationship of each module is analyzed, and the fault tree is established. Based on the fact that the failure rate of each module of electronic components is difficult to obtain, the fuzzy set theory is introduced into the fault tree analysis, and the failure rate of the bottom event is obtained by the fuzzy evaluation of the weight expert. The importance of fault tree is obtained by qualitative and quantitative analysis, which provides a technical reference for fault diagnosis of equipment. Finally, the software and hardware of the designed electronic component detection and fault diagnosis system are tested. The test results show that the system is superior in performance, achieves the expected goal, and meets the requirements of various indexes and functions. At present, the detection system has been put into use, and has a high practical value.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V267

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