1前言随着液压系统大型化、复杂化和近代化对液压系统和元件的可靠性要求越来越高,因而对其在线监测和故障诊断的要求也越来越迫切。液压系统故障诊断的传统方法:维修技术人员凭感觉和经验,通过看、听、触、测等判断故障的原因。一般方法:采取逻辑诊断法、溢流阀检测法和加热检测法等。精密方法:振 1 Introduction With the increasing size, complexity and modernization of hydraulic systems, hydraulic systems and components are increasingly demanding in terms of reliability. Therefore, the requirements for on-line monitoring and fault diagnosis are becoming more and more urgent. Hydraulic system fault diagnosis of traditional methods: Maintenance technicians with the feeling and experience, through the look, hear, touch, test and other reasons to determine the fault. The general method: to take the logic diagnosis method, relief valve detection method and heating detection method. Sophisticated methods: vibration