# Study on dynamic model of gear system

It is the central task of gear system dynamics to establish accurate dynamic model of gear system. Only by establishing the analysis model of gear system can the dynamic analysis of gear system be carried out effectively. According to the different factors considered among gear pairs, the dynamic models... # Analysis of gear failure by refined spectrum analysis

Due to the complexity of gear fault symptoms and signals, it is necessary to extract clear fault feature information on the premise of eliminating noise interference and improving signal-to-noise ratio as much as possible. There are several common methods. The refined spectrum analysis method is to increase the frequency... # An example of gear failure analysis

Gear is a kind of mechanical part that transmits motion and power. The type and characteristics of gear not only determine the running characteristics of gear, but also determine whether it will fail prematurely. There are four types of gear failure: (1) Wear failure refers to the material loss... # Other components of gear vibration signal

1) Additional pulse Sometimes it can be seen that the envelope lines at the upper and lower ends of the amplitude of the total signal in the time domain of the gear are asymmetric, which are quite different from each other. This carrier signal is asymmetric with the zero... # Analysis on the causes of gear damage

Consider the following issues comprehensively： Whether the gear material meets the requirements Whether the accuracy of gear machining meets the requirements, so it is necessary to conduct a comprehensive inspection of the gear parameters, tooth profile, tooth direction and root scanning Whether the bearing is qualified Hardness of root... # Analysis of gear failure by cepstrum analysis

There are two ways to express the amplitude of spectrum: one is in the form of amplitude, which is called amplitude spectrum; the other is in the form of energy, which is called power spectrum. Power spectrum is used to study the distribution of energy in frequency domain. There... # Determining the modification coefficient of two gears

① ② Selection of normal face modification coefficient of pinion Selection principles: (1) when the hardness of the gear surface is not high (hbs350), the transmission failure is often caused by the fracture of the gear teeth caused by the fatigue crack propagation of the gear roots. In this... # Calculate the pressure angle of dividing cylinder, base cylinder and pitch cylinder, normal surface and end pitch circle of gear

① Spiral angle of two gears: β1=0.5×（Σ-1）   β2=β1 ② Two gear indexing cylinder helix angle: ③ Two gear base cylinder helix angles: ④ Helical angle of two gear segments: ⑤ Pressure angle of normal pitch circle of two gears: ⑥ Pressure angle of end pitch circle of two gears: # The selection principle of gear material

There are many kinds of gear materials, and there are many factors to consider when selecting them. The following points can be used for reference when selecting materials: 1) The gear material must meet the requirements of working conditions. For example, in order to meet the requirements of small... # Modulation characteristics of gear vibration signal

The common points of frequency modulation and amplitude modulation of gear vibration signal are as follows: ① The carrier frequency is equal; ② The sideband frequency is equal; ③ The sideband is symmetrical to the carrier frequency. In the actual gear system, the AM effect and FM effect always... 