Modal Analysis for Sun Gear Shaft of Tractor HMCVT Based on ANSYS

Established on the basis of introducing the theory modal analysis,and based on UG software,sun axle three-dimensional model of the tractor hydraulic mechanical continuously variable transmission(HMCVT)is established.Using ANSYS-UG data interface to lead the sun wheel three-dimensional solid model into ANSYS to generate finite element analysis model,and using of two modal analysis,free modal analysis and constraint modal analysis to do the modal analysis to the sun gear shaft.The results show that: two modal analysis methods can get a more accurate calculation result,but constraint modal analysis method can better reflect the actual working conditions of the system;the sun axle in low-end frequencies is mainly in bending touch state,and in high-end frequency is in overall torsional modes and partial mixed modes.This study provides a theoretical basis for the structural design of slender shaft and analysis of dynamic characteristics.