Modal and Harmonic Analysis of Spur Gear using FEA.

Spur gears are used to transmit power and motion from one shaft to another shaft when the shafts are parallel. While running, gear drives are subjected to variable speed and load. Imperfection in the gears leads to an increase in the sound level and vibration level. The imperfections which cause the vibration are eccentricity, pitting, broken gear tooth, and crack. The best design practice of spur gear leads to a decrease in the vibration level in the gear drive. In the present work 20MnCr5 alloy steel is considered as gear and pinion material. Two different gears are modelled using Solid Works one is healthy gear and another is single tooth broken gear then it is analysed for modal response and harmonic response at three different torque values. The results show that natural frequency is higher at 6th mode and the corresponding mode shape is torsion and bending. Deformation and stress amplitude at Y-axis is more with a high amplitude of vibration. Also, total deformation is supreme in single tooth broken gear at the torque of 58875 N-mm. [ABSTRACT FROM AUTHOR]