Vibration Analysis for Two Wheeler Gearbox Casing using FEA

Abstract

The gearbox casing protects the components of gearbox. It provides the fluid tight casing to hold the lubricants and provides support to moving components. Gearbox casing failure is the main problem for the vehicle manufacturer. Noise and vibration are the main reason for failure. So it is required to reduce the level of noise and vibration. In order to prevent failure the natural frequency and natural mode shapes should be known. In this paper, the vibration analysis of two wheeler gearbox casing by adding ribs was performed by finite element simulation using NASTRAN software. Gearbox casing design is a complex procedure. Design of gearbox casing was done by using CATIA, the model is imported in Hyper Mesh for meshing, modal analysis is done by using NASTRAN solver and Hyper View is used as post processor. This analysis is done for finding the natural frequency of gearbox casing in order to prevent resonance. The vibration pattern for first ten modes was studied. The analysis shows the natural frequency of vibration which varies from 857.3 Hz to 4726 Hz. The External excitation on gearbox casing must be eliminated to prevent the fracture of casing. The reason of the fracture is matching of external excitation frequency to natural frequency of gearbox casing. From the result, this analysis shows the range of the natural frequency of two wheeler gearbox casing.