支架液压阀测试系统的故障诊断与软件可靠性研究

发布时间：2018-03-24 07:34

本文选题：液压系统　切入点：专家系统　出处：《电子科技大学》2011年硕士论文

【摘要】：为了解决支架液压阀测试系统在故障发生时由于诱因复杂而综合,导致故障难于排除的问题,本文开发了一套基于LabVIEW的液压系统在线状态监测和故障诊断专家系统。该系统与数据采集、系统总线、智能控制和虚拟仪器技术等理论相结合,可迅速查出测试系统的故障发生位置和原因,并提供给用户相应的故障排除建议。因此,故障诊断专家系统的应用避免了用户盲目地查找故障,节省了维护时间和成本,提高了系统的运行效率和经济效益。该故障诊断专家系统以LabVIEW为开发平台。首先,搭建了基于NI硬件平台的在线状态监测模块。NI的数据采集板卡采集由传感器检测回来的各个监测参数信号,如压力、温度和流量等,然后交给计算机软件进行数据的分析和处理,并提取出故障特征信号。其次,开发了故障诊断模块。根据参数测量法原理,将特征信号与设备正常运行时的参数进行比对,以此来判断是否有故障发生。有则实施报警并进行故障处理。否则,对参数变化情况进行预测。此外,详细阐述了利用产生式规则表示知识的原理和采用Microsoft Access建立专家系统知识库的方法。最后,建立合理的解释机制将故障原因、发生的具体位置和解决措施以用户易于理解的方式呈现出来。该故障诊断专家系统实现了液压系统运行参数的可视化和高效快捷的故障诊断能力。同时,配合LabVIEW强大的数据处理工具包可以对采集数据进行更多后期处理,以满足不同用户的需要。
[Abstract]:In order to solve the problem that the fault of hydraulic valve test system of support is difficult to eliminate because of the complex inducement and synthesis when the fault occurs, In this paper, an online condition monitoring and fault diagnosis expert system for hydraulic system based on LabVIEW is developed, which combines with the theories of data acquisition, system bus, intelligent control and virtual instrument technology. The fault location and cause of the test system can be found out quickly, and the corresponding fault troubleshooting suggestion can be provided to the user. Therefore, the application of the fault diagnosis expert system can avoid the blind searching of the fault by the user and save the maintenance time and cost. The operating efficiency and economic benefit of the system are improved. The fault diagnosis expert system is developed on the platform of LabVIEW. Firstly, the on-line state monitoring module based on NI hardware platform .NI data acquisition board is built to collect the monitoring parameter signals, such as pressure, which are detected by sensors. The temperature and flow rate are then given to the computer software for data analysis and processing, and fault characteristic signals are extracted. Secondly, the fault diagnosis module is developed. The characteristic signal is compared with the parameters of the equipment in normal operation to determine whether there is a fault or not. If there is an alarm and the fault is processed, otherwise, the variation of the parameters is predicted. In addition, The principle of using production rules to express knowledge and the method of establishing expert system knowledge base by Microsoft Access are described in detail. The exact location and solution of the occurrence is presented in a manner that is easily understood by the user. The fault diagnosis expert system realizes the visualization of operating parameters of hydraulic system and the ability of efficient and fast fault diagnosis. At the same time, with the powerful data processing toolkit of LabVIEW, the collected data can be processed more later. To meet the needs of different users.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.52;TH165.3

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