中文摘要：

以故障树分析为基础，综合考虑最小割集的搜索成本、故障概率及影响程度等因素研究了液压系统的故障定位问题。针对系统特点确定了最小割集的数量和属性，利用权的最小平方法建立了加权规范化故障定位搜索决策矩阵，利用相对贴近度法对最小割集进行综合排序求出了搜索序列。针对充液阀故障引起压装机主缸不能工进这一工程问题，采用算法给出的搜索序列较好地实现了快速、准确的故障定位，验证了该算法的有效性。

英文摘要：

On the basis of fault tree analysis, fault localization of hydraulic system was investigated by comprehensive consideration of search cost, fault probability, impact degree and other factors of the minimum cut sets. The number and attribute of minimum cut sets were determined according to the system eharacteristies, and weighted normalized decision matrix of fault localization was established by use of weighted least-square method, then search sequence was calculated based on minimum cut sets＇ comprehensive rank by means of relative closeness method. For the master cylinder＇s failure to work speed caused by charging valve faults in the engineering practice of the assembling press, rapid and accurate fault localization was realized combined with the search sequence given by the algorithm, and the effectiveness of the algorithm was verified.