基于虚拟仪器的精密部件电路板故障检测与诊断系统的研究

发布时间：2018-10-14 15:14

【摘要】：随着科学技术的飞速发展,机械设备向着大型化、高速化、高强度、自动化和高性能的方向发展,但同时潜伏着一个危机,即一旦发生故障,所造成的损害将十分严重。火控系统是一套使被控武器发挥最大能效的装置,它的运行状态直接影响到该武器的安全运行,对火控系统的控制电路板进行故障诊断与检测具有重要的实际意义。本文首先分析了国内外对于故障诊断技术的发展及研究现状。然后,针对当前精密部件电路存在故障检测复杂、可扩展性差和辅助维修难度大等问题,特别是在设备故障诊断领域中,由于诊断对象的复杂性、测试手段的局限性和知识的不确定性导致的不确定性问题占多数,建立了基于故障树的概率推理贝叶斯网络进行故障分析,结合贝叶斯网络算法和隐马尔科夫模型建立电路板检测模型。在此基础上,按照系统开发的总体指导原则,以工业控制计算机为监视操作单元,通过虚拟仪器的实时采集并显示,实现元件级的故障检测。本文对各系统的硬件组成结构、软件开发平台、故障检测与诊断的设计过程都进行了详细介绍。本系统结构简单可靠,可在线重构,扩展性好。软件体系具有向上兼容性和易维护性。通过验证试验,该测试与诊断系统具有很好的测试精度,较高的可靠性与可重复性,极大地提高了功能测试和故障定位的效率。其测量精度、可靠性均达到实际应用要求。
[Abstract]:With the rapid development of science and technology, mechanical equipment is developing towards the direction of large scale, high speed, high strength, automation and high performance, but at the same time, there is a latent crisis, that is, once the failure occurs, the damage will be very serious. Fire control system (FCS) is a set of devices to maximize the energy efficiency of the controlled weapon. Its operating state directly affects the safe operation of the weapon. It is of great practical significance for the fault diagnosis and detection of the control circuit board of the fire control system. This paper first analyzes the development and research status of fault diagnosis technology at home and abroad. Then, aiming at the problems of complex fault detection, poor expansibility and difficulty of auxiliary maintenance in the current precision component circuits, especially in the field of equipment fault diagnosis, because of the complexity of diagnostic object, The limitation of test means and the uncertainty of knowledge account for the majority of uncertainty problems. A probabilistic reasoning Bayesian network based on fault tree is established for fault analysis. Combining Bayesian network algorithm with hidden Markov model, the circuit board detection model is established. On this basis, according to the general guiding principle of the system development, the industrial control computer is used as the monitor and operation unit, and the component level fault detection is realized through the real-time acquisition and display of the virtual instrument. In this paper, the hardware structure, the software development platform, the design process of fault detection and diagnosis are introduced in detail. The system is simple and reliable, can be reconfigurable on-line, and has good expansibility. The software system has upward compatibility and maintainability. The test and diagnosis system has good testing accuracy, high reliability and repeatability, and greatly improves the efficiency of function testing and fault location. The accuracy and reliability of the measurement meet the requirements of practical application.
【学位授予单位】：山东农业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH165.3

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