In order to further evaluate the influence of gear pitting failure on the dynamic response of gear system, the meshing stiffness of healthy gear and pitting fault gear is taken as the internal excitation of gear system respectively, and the dynamic response of healthy gear and pitting fault gear system is calculated by Runge Kutta method. In order to facilitate the following analysis and expression, healthy gear system and pitting fault system are used.
Figure 1 shows the dynamic response of the gear system of the healthy gear and the pitting fault gear, and the vibration signal duration is 0.14s. It can be clearly observed that for the dynamic response of healthy gear, the vibration response signal is relatively stable in time domain; for the dynamic response of pitting fault gear, the amplitude of vibration response signal increases abnormally in time domain, which reveals the influence of pitting fault on the dynamic response of gear system.
In order to quantify the fault characteristics of the dynamic response signals of healthy gears and pitting failure gears, the statistical indicators of the response signals of healthy gears and pitting failure gears given in Fig. 1 are shown in Fig. 2. From the bar graph, it can be seen that the RMS value, peak peak value and peak coefficient value of the response signal of pitting fault gear are increased compared with the healthy gear, and the peak peak value and wave peak coefficient are more obvious in distinguishing the gear state.