基于多信号模型电子系统综合诊断软件方案与实现

发布时间：2019-02-15 16:22

【摘要】：随着计算机技术和大规模集成电路的广泛应用:一方面,电子系统在现代大型系统中所占比例越来越高,有效提高和改善了系统性能;另一方面,电子系统故障在系统总故障中所占的比例也越来越高,如果不能得到及时有效的处理,对系统性能的制约也非常明显。因此,研究电子系统综合诊断对于保障整个系统的高效运行具有十分重要的意义。首先,本文对已有的电子系统诊断方法进行了调研分析:多信号模型相当于在结构模型上叠加了多个单信号,而且与系统框图有直观联系,非常适合用于复杂电子系统综合诊断建模;TEAMS软件可以直接导出系统的依赖矩阵,方便故障诊断。所以本文提出了一个以多信号建模为基础,以综合诊断软件和诊断算法为核心,以PHM数据库作为保障的一体化电子系统综合诊断方案。并且以模块化编程的思想为综合诊断软件的实现做了总体设计。其次,本文在研究了实时推理诊断算法和基于拉格朗日松弛的故障诊断算法之后,结合虚警处理算法,开发了电子系统综合故障诊断软件。在软件的界面设计和算法的具体实现上做了大量的工作,具体为:用UML对软件的主要视图类进行了设计和封装,用DLL封装和多线程技术提高了算法调用的灵活性和效率,保证了诊断平台具有较好的扩展性,诊断算法具有较好的时效性和较高的故障检测率、故障隔离率。再次,本文还开发了基于SQL SERVER 2005的PHM数据库系统。数据库管理软件远程连接服务器,不仅为诊断平台提供支持,还对用户单位的专有数据库提供可视化管理,功能较为丰富。本文一方面对服务器端的数据库进行了详细设计,包括数据库的逻辑设计和E-R设计,使数据库的结构满足第二范式的要求;另一方面对数据库管理软件的重要功能实现以及优化措施做了详细阐述。最后,根据用户单位提供的指标,作者对诊断平台的准确性和时效性做了大量的验证,证明了该故障诊断软件对电子系统的诊断指标满足实际需求;对数据库软件进行了功能测试和可靠性测试,软件的功能和响应速度完全正常,而且有一定的容错能力和保护机制,可以为诊断平台提供有效可靠的保障。
[Abstract]:With the wide application of computer technology and large scale integrated circuits, on the one hand, the proportion of electronic systems in modern large-scale systems is becoming higher and higher, which effectively improves and improves the system performance; On the other hand, the proportion of electronic system faults in the total system faults is also increasing. If the electronic system failure can not be dealt with in a timely and effective manner, the system performance constraints are also very obvious. Therefore, it is very important to study the integrated diagnosis of electronic system to ensure the efficient operation of the whole system. First of all, the existing diagnosis methods of electronic system are investigated and analyzed in this paper: the multi-signal model is equivalent to superimposing several single signals on the structural model, and has direct relation with the system block diagram. It is very suitable for integrated diagnostic modeling of complex electronic systems. TEAMS software can directly derive the dependency matrix of the system and facilitate fault diagnosis. Therefore, this paper presents an integrated electronic system integrated diagnosis scheme based on multi-signal modeling, with integrated diagnosis software and diagnosis algorithm as the core, and PHM database as the guarantee. And the idea of modular programming for the implementation of the comprehensive diagnosis software to do the overall design. Secondly, after studying the real-time reasoning diagnosis algorithm and the Lagrangian relaxation fault diagnosis algorithm, combined with the false alarm processing algorithm, a comprehensive fault diagnosis software for electronic system is developed. A great deal of work has been done on the interface design of software and the realization of algorithm. The main view classes of the software are designed and encapsulated with UML, and the flexibility and efficiency of algorithm call are improved by DLL encapsulation and multithreading technology. It ensures that the diagnosis platform has better expansibility, and the diagnosis algorithm has better time-efficiency, higher fault detection rate and fault isolation rate. Thirdly, this paper also develops the PHM database system based on SQL SERVER 2005. The remote connection server of database management software not only provides support for diagnostic platform, but also provides visual management for the proprietary database of user units. On the one hand, the database on the server side is designed in detail, including the logical design and E-R design of the database, so that the structure of the database can meet the requirements of the second normal form. On the other hand, the realization of important functions of database management software and optimization measures are described in detail. Finally, according to the index provided by the user unit, the author has done a lot of verification on the accuracy and timeliness of the diagnostic platform, which proves that the diagnostic index of the fault diagnosis software to the electronic system meets the actual demand; The function and reliability of the database software are tested. The function and response speed of the software is completely normal, and it has certain fault-tolerant ability and protection mechanism, which can provide effective and reliable guarantee for the diagnosis platform.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP311.13;TN0

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