Gearboxes have a significant role in the operation of rotating machinery. Several techniques exist for the diagnosis of fault in gearboxes. This work presents the techniques for the condition monitoring and fault diagnosis of the gearboxes based on Acoustic Emission (AE). The review describes the application of AE to detect the various types of fault in the gearboxes for different types of gear, the AE parameters used for the gearbox fault diagnosis, AE signal processing techniques, feature extraction techniques for the fault identification of gearbox, modelling of AE generated in gearbox and fault location detection using AE technique. After detailed description of the various techniques, some potential research issues are also discussed which is associated with condition monitoring and fault diagnosis of gearboxes using AE.

变速箱在旋转机械的运行中起着重要作用。存在几种用于诊断变速箱故障的技术。这项工作提出了基于声发射（AE）的变速箱状态监测和故障诊断技术。这篇综述描述了AE在变速箱中检测不同类型齿轮的各种类型故障的应用，用于变速箱故障诊断的AE参数，AE信号处理技术，用于变速箱故障识别的特征提取技术，变速箱中产生的AE和使用AE技术的故障定位检测。在详细描述了各种技术之后，还讨论了一些潜在的研究问题，这些问题与使用AE进行变速箱的状态监测和故障诊断有关。