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为了通过对发动机中所用的机油进行分析来诊断柴油机的内部状态，故意地造成了下述两种型式的发动机故障并对其进行了分析研究：一种故障是使曲轴和主轴承或连杆大端轴承之间咬死；另一种故障是使活塞和气缸套之间过热。通过应用铁份记录图来分析抽取的机油试样中的磨损产物，从而揭示了柴油机损坏的严重程度与在故障的每一阶立中产生的磨损产物之间的相互关系。
In order to diagnose the internal state of a diesel engine by analyzing the oil used in the engine, two types of engine faults are deliberately caused and analyzed: one is to make the crankshaft and main bearing or connecting rod large Sealing between end bearings; another failure is to overheat the piston and cylinder liner. The analysis of the wear products in the drawn oil samples by applying the iron score chart reveals the correlation between the severity of the damage to the diesel engine and the wear products produced at each stage of the failure.