Dynamic Tooth Root Strain of High-Contact-Ratio Spur Gear with Crack Fault
In order to investigate the effect of crack on the dynamic tooth root strain of high-contact-ratio spur gear,a dynamic model of a gear system is established using the lumped-mass method,and the dynamic meshing force is obtained by solving the system dynamic equation with the time-varying mesh stiffness un-der crack fault as the input. Based on the finite element method,a dynamic model of a gear structure with crack fault is established,the load sharing between gear teeth is calculated via the loaded tooth contact anal-ysis method,and the time history of the tooth root strain is obtained by transient analysis method. The dy-namic tooth root strain with different crack depths are analyzed. The results demonstrated that,when the driven gear cracks,its fault characteristics of dynamic tooth root strain are mainly manifested by the change of its value in meshing area,and the fault characteristics of dynamic tooth root strain of driven gear are mainly manifested by the periodic impact and amplitude attenuation in the time history of tooth root strain. Under the crack depth of 1.5 mm,the relative variation of the peak factor of the dynamic tooth root strain of driving gear reaches 12.72％.
万方数据
维普
