Influence of Crack on Structure Vibration of Gear Tooth |
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Authors: | Renping Shao Xinna Huang Yonglong Li |
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Affiliation: | (1) School of Mechatronics, Northwestern Polytechnical University, Xi’an, 710072, China |
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Abstract: | This paper presents a theoretical model for analyzing the dynamic characteristic such as natural frequencies and vibration
mode shapes of cracked gears. The influence of crack position and crack size on the dynamic characteristic of gears is thoroughly
investigated using the proposed theoretical model as well as the finite element method (FEM) for the sake of model validation.
The theoretical analysis and numerical simulation show that the influence of crack size and crack position on the dynamic
responses of cracked gears is significant and that the influence of crack position is larger than that of crack size. The
natural frequencies drop with the increase of crack size and the low order natural frequencies drop more notably. The natural
frequencies drop more significantly when crack is located at tooth root than at tooth tip. The vibration mode shapes of cracked
gear tooth are very different from those of gear tooth without crack, and the vibration amplitude increases significantly
in crack neighborhood. These observations are very valuable for damage detection and fault diagnosis of gear system. |
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