Crack Propagation and Fault Diagnosis for Gears Using Fem论文.pdf

Crack Propagation and Fault Diagnosis for
Gears Using FEM




A Thesis Submitted to Chongqing University
in Partial Fulfillment of the Requirement for the
Degree of Master of Mechanical Engineering
By
Birahima GUEYE

Supervised by Prof. Shao Yimin
Major:Machine Design and Theory


College of Mechanical Engineering of
Chongqing University, Chongqing, China
May 2011
Crack Propagation and Fault Diagnosis for
Gears Using FEM







重庆大学硕士学位论文



学生姓名:Birahima GUEYE
指导教师:邵毅敏教授
专业:机械设计及理论
学科门类:工学




重庆大学机械工程学院
二 O 一一年五月
ABSTRACT

ABSTRACT

The monitoring and diagnosis of mechanical systems rose to the rank of major
industrial concerns. The current trend is to look for tools that can reveal an early onset
of dysfunction in order to gradually replace the systematic maintenance by preventive
maintenance.
Over the last two decades, problems arising from excessive wear and gear tooth
damage in gear transmission systems have been of increasing concern for a variety of
gear users. A large range of gear models have appeared in the literature either discussing
about the effect of gear rim thickness on crack propagation path or simulating the
dynamic behavior of gears in the presence of faults. In the former, they are mainly based
on the fundamentals of fracture mechanics that involve tremendous variables and
equations, and/or coupling puter software packages to make crack
propagation predictions possible. In the later, few literatures are manly focus in one
hand on three dimensional crack fault simulation and in another hand, use analytical
approach to study other defect cases. In the aim to improve the current generation of
diagnostic techniques this present thesis firstly introduced a new appropriate
methodology for gear tooth crack path prediction bases on an evolutionary structural
optimization using a two dimensional analysis of a spur ge