Nonlinear dynamic analysis and defect detection of gears

Abstract

In the current work, the nonlinear dynamic behavior of an eight degrees of freedom gear system is investigated. Tooth crack is introduced into the model. The main sources of excitation are the time varying mesh stiffness (TVMS), time varying mesh damping, backlash and friction inter teeth. By using the potential energy method applied into the cantilevered beam, the TVMS is calculated. The backlash is considered as a dead zone. The effect of backlash, friction and tooth crack on the vibration frequencies is highlighted. The crack detection is based on the time-frequency analysis.

Finite element analysis of gear of full-rotating propeller steering assembly

“…How to reduce the vibration can be achieved by optimizing the gear tooth profile and gear meshing. In addition, it is also necessary to rule out whether there is a crack in the gear; when there is a crack in the gear, the vibration generated in the process of gear meshing is more likely to cause structural damage [7][8].…”