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近年来，随着液压系统向大型化、连续生产、自动控制方向发展，又出现了多种现代故障诊断方法。如铁谱技断，可从油液中分离出来的各种磨粒的数量、形状、尺寸、成分以及分布规律等情况，及时、准确地判断出系统中元件的磨损部位、形式、程度等。而且可对液压油进行定量的污染分析和评价，做到在线检测和故障预防。再如基于人工智能的诊断系断，它通过计算机模仿在某一领域内有经验解决问题的方法。将故障现象通过人机接口输入计算机，计算机根据输入的现象以及知识库中的知识，可推算出引起故障的原因，然后通过人机接口输出该原因，并提出维修方案或预防措施。这些方法给液压系统故障诊断带来广阔的前景，给液压系统故障诊断自动化奠定了基础。但这些方法大都需要昂贵的检测设备和复杂的传感控制系统和计算机处理系统，有些方法研究起来有一定困难。目前不适应于现场推广使用。下面介绍一种简单、实用的液压系统故障诊断方法。

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一个液压系统工作是否正常，关键取决于两个主要工作参数即压力和流量是否处于正常的工作状态，以及系统温度和执行器速度等参数的正常与否。液压系统的故障现象是各种各样的，故障原因也是多种因素的综合。同一因素可能造成不同的故障现象，而同一故障又可能对应着多种不同原因。例如：油液的污染可能造成液压系统压力、流量或方向等各方面的故障，这给液压系统故障诊断带来极大困难。

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