Fault feature extraction of gear tooth crack of planetary gear-box based on constructing vibration separation signals and synchronous average
Zhao Lei, Guo Yu, Wu Xing
Yunnan Provincial Higher Institution Key Lab of Vibration & Noise, College of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China
Planet gear’s planetary motion causes time-varying vibration transmission path in a planetary gear box, its vibration responses are essentially different from those of conventional fixed-axis gearboxes, the traditional synchronous average method can’t be directly applied in a planetary gear-box. In order to solve this problem, the windowed synchronous averaging method developed abroad can effectively overcome the variable transmission path of planetary gear-box vibration. Here, the principle and realization for fault feature extraction of gear tooth crack of planetary gear-box were presented in detail based on constructing vibration separation signals and synchronous average. With this method, the characteristic of gear’s mesh tooth sequence was verified firstly. According to the characteristic of tooth sequence, the appropriate window function was selected to perform window interception of signals. Then the target gear’s vibration signals were constructed according to the rearranged gear tooth sequence and window intercepted signals. Finally, the synchronous average of vibration separation signals was done. The analysis for the actual measured signals of tooth root crack of a planetary gear-box showed that the presented method can be used to effectively extract fault features of a planetary gear-box.
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