Gear transmission is an important part of mechanical transmission. It has the advantages of compact structure, high transmission efficiency, long life and stable transmission ratio. It can complete the transmission task of motion and power in different working environments. It is widely used in engineering machinery, agricultural machinery, mining machinery, transportation machinery, chemical machinery, aerospace, shipping, and other mechanical equipment. However, due to the complex structure of gear transmission system and harsh working environment, its key parts are vulnerable to various damages, which directly affect the safe and stable operation of the whole mechanical equipment.
Among them, 80% of the faults in the transmission machinery are caused by the failure of the parts in the gear transmission system. How to find and identify the faults of the traditional gear system is the key to ensure the reliable and safe operation of the mechanical system. In order to effectively identify the fault of gear transmission system, a variety of detection and fault diagnosis methods are applied. However, the gear transmission system is a complex nonlinear system with many influencing factors and various fault forms. As a result, the research on fault mechanism of gear transmission system is insufficient, and it is difficult to effectively explain the source of many frequency components in the fault signal, so it is difficult to accurately diagnose the fault of gear transmission system.
Therefore, strengthening the research on fault mechanism of gear transmission system and combining with relevant fault diagnosis methods can realize accurate diagnosis and identification of gear transmission system fault, which can effectively reduce equipment accidents and major economic losses caused by gear transmission system fault.
Gear transmission system is mainly composed of gear, bearing, rotor and other parts. System failure is mainly component failure, including pitting, peeling, gluing, crack, broken teeth, wear and other fault forms, which seriously affect the transmission accuracy of the gear transmission system, aggravate the vibration of the system and affect the working state of the mechanical system. Once a fault occurs in the gear transmission system, the components interact with each other, so that not only a single component fails, but also many components are likely to be coupled together, which undoubtedly brings some difficulties to the condition monitoring and fault diagnosis of the gear transmission system.
Therefore, aiming at the gear and support bearing parts which are prone to failure in gear transmission system, the influence of typical component faults on the vibration characteristics of gear transmission system is studied, so as to master the fault mechanism and characteristics of gear transmission system, and lay a theoretical foundation for the development of fault diagnosis method of gear transmission system.