基于质心广义力监测的发动机故障诊断新方法

发动机的故障诊断大多只针对某一特定类型的故障,分析对象的特征与故障的映射关系不明确,且提取的特征通用性不好,导致发动机故障诊断发展缓慢,至今尚没有一套成熟的诊断系统可应用于实际。分析了基于振动的发动机故障诊断的国内外研究动向,提出将质心广义力作为汽车发动机故障诊断的分析对象,明确发动机故障诊断分析对象的特征与故障的映射关系,对于开辟发动机故障诊断方法的新途径具有重要意义。

A new method for engine fault diagnosis based on generalized force at the center of gravity of engines

At present, most of the engine fault diagnosis is specific to a particular type of failure, and the mapping relationship between the analysis object features and the faults is not clear, so that the extracted features have poor universality, resulting in slow development of engine fault diagnosis, and there is no a mature diagnosis system can be used in practical application. Vibration based engine fault diagnosis research trends are analyzed both at home and abroad. The generalized force at C.G.(the center of gravity of engine) is proposed to be the analysis object for engine fault diagnosis, and clear mapping relationship between the analysis object features and the faults is achieved. It is significant for developing new engine fault diagnosis methods.