Review of incipient fault diagnosis methods
微小故障诊断方法综述

According to their characteristics, incipient faults are divided into gradual incipient faults, abrupt incipient faults and intermittent incipient faults. Furthermore, we propose a classification framework of diagnosis methods for incipient faults, and classify all incipient falut diagnosis methods into three categories, i.e., qualitative diagnosis methods, quantitative diagnosis methods, as well as semi-qualitative semi-quantitative diagnosis methods. Each category of existing incipient falut diagnosis methods is further subdivided. The basic ideas, research progresses, application conditions and applications of every method are discussed in details. Finally, some open problems in this area are introduced.