Abstract
Tooth pitting is a common failure mode of a gearbox. Many researchers investigated dynamic properties of a gearbox with localized pitting damage on a single gear tooth. The dynamic properties of a gearbox with pitting distributed over multiple teeth have rarely been investigated. In this paper, gear tooth pitting propagation to neighboring teeth is modeled and investigated for a pair of spur gears. Tooth pitting propagation effect on time-varying mesh stiffness, gearbox dynamics and vibration characteristics is studied and then fault symptoms are revealed. In addition, the influence of gear mesh damping and environmental noise on gearbox vibration properties is investigated. In the end, 114 statistical features are tested to estimate tooth pitting growth. Statistical features that are insensitive to gear mesh damping and environmental noise are recommended.
Highlights
Gearbox is one of the most widely used transmission systems in the world
When tooth pitting appears on gears, gear mesh stiffness reduces and correspondingly the vibration properties of gears change
To avoid the influence of both gear mesh damping and environmental noise, 6 features are suggested to use. They are raw signals (RAW)-F11, residual signals (RES)-F9, RAW-F8, RAW-F21, RAW-F9, difference signals (DIFF)-F10. These 6 features belong to both the top 8 features selected in Section 4.1 considering gear mesh damping effect and the top 10 stable features selected in Section 4.2 considering environmental noise effect
Summary
Gearbox is one of the most widely used transmission systems in the world. due to high service load, harsh operating conditions or fatigue, faults may develop in gears [1]. Feng and Zuo [9] proposed a mathematical model to investigate fault symptoms of a planetary gearbox with tooth pitting. We will model gear tooth pitting propagation to neighboring teeth and analyze its effect on gearbox vibration. 114 statistical features are generated and tested using simulated vibration signals for the pitting growth estimation of a fixed-axis gearbox. The objective of this study is to simulate vibration signals of gears with tooth pitting covering multiple teeth, investigate pitting effects on vibration properties and provide effective features for pitting growth estimation. A dynamic model is used to investigate the effects of tooth pitting growth on vibration properties of a gearbox. A summary and conclusion of this study is given
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