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液压系统在大功率和自动化工程机械中得到了广泛应用。但在工程实际中,由于结构复杂使得液压系统的故障诊断非常困难。特别是在现场施工过程中,如果液压系统的故障得不到及时处理,会导致设备长时间的停工而严重影响到施工效率。为此,提出了一个远程视情维护解决方案,通过对失效模式与影响分析(FMEA)方法的扩展和工程机械液压系统FMEA知识库的开发,实现专家知识与设备工作过程中实时采集数据的集成。介绍了系统的整体结构设计、数据采集、故障特征提取以及FMEA知识库的建立等关键技术,并给出了一个工程实际案例。
Hydraulic system has been widely used in high-power and automatic construction machinery. However, in engineering practice, it is very difficult to diagnose the fault of hydraulic system due to its complicated structure. Especially in the process of on-site construction, if the failure of the hydraulic system can not be dealt with promptly, it will cause the equipment to stop working for a long time and seriously affect the construction efficiency. Therefore, a solution of remote condition-based maintenance is proposed. Through the expansion of the failure mode and effect analysis (FMEA) method and the development of the FMEA knowledge base of the hydraulic system of construction machinery, the integration of expert knowledge and real-time data collection during equipment operation . The key technologies such as the overall structure design, data acquisition, fault feature extraction and establishment of FMEA knowledge base are introduced, and a practical case is given.