Aiming at the problem of difficult to diagnose local defects of aero-engine intershaft bearing, a new diag- nosis approach of sideband difference diagnostics of local defects for aero-engine intershaft bearing was proposed in this paper. Based on operating characteristic of intershaft bearing for both inner and outer ring rotation, the ap- proach used signal modulation frequency sideband as the main fault information, and established a complete set of fault diagnosis procedure. Experiments of an aero-engine inter bearing with the outer ring failure were carried out. Using the proposed approach, the local defects of the bearing was judged accurately. The theoretical analysis and fault bearing diagnosis example showed that the method can identify local defects of intershaft bearing and is effec- tive in local defects diagnosis for the aero-engine intershaft bearing%针对航空发动机中介轴承局部故障难以诊断的问题,提出了航空发动机中介轴承局部故障边带差值诊断法。该方法利用中介轴承内外环均旋转的运转特点,将其故障振动信号的调制边频带分量作为故障信息,建立了一套完整的故障诊断步骤,在实验器上对具有外环剥落故障的某型中介轴承进行实验,准确判断了该轴承故障。理论分析和诊断实例表明,该方法可以识别中介轴承局部故障,是一种适合航空发动机中介轴承局部故障诊断的有效方法。
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