Surface Strengthening technology is an effective method to make surface of the workpiece generate plastic deformation by external force ,to refine the material grain as well as change the stress status and improve the surface quality.Thus the fatigue life of metal workpieces are prolonged.The traditional strengthologies technologies as a kind of process on deep hole have been widely employed by industrial circles ,but it is difficult to satisfy the strengthening of the micro-hole.Laser shot peening is a modem technical tool with the development of laser science and technologyAfter systematically analyzing the advances on strengthening technologies of deep hole,a novel strengthening technologies process on deep hole by laser shot peening was given,Meanwhile the mechanism and characteristics of strengthening technologies on deep hole machining by laser shot peening is described in detail,and the application prospect and development trend of the technologies are analyzed comprehensively.%发动机附件的正常工作关系到发动机的正常工作和飞行安全,同时对飞机用户的经营效益造成直接或间接的影响.由于PA44飞机的发动机起动机在实际应用中发生故障的几率较高,选择该发动机的起动机进行可靠性分析,为维修间隔时间的调整提供参考.依据飞机维修现场收集到的起动机故障数据,利用新平均秩数据进行处理,再根据图形估计法判定故障数据服从威布尔分布,并用最小二乘法算出威布尔分布的未知参数,用K-S检验法检验故障数据服从威布尔分布的合理性.最后用计算出的起动机的平均寿命,与该发动机的实际拆换情况进行料对比,并说明可靠性分析结果的应用.
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