Vibration Analysis of MINIDOR Force Bajaj Engine Mount Using FEA

Abstract

Due to low cost and simplicity, many Ethiopian people use MINIDOR Force Bajaj and others Bajaj for transportation. However, these vehicles experience vibrations due to road conditions, engine dynamics, and their overall condition. This thesis investigates the vibration characteristics of the Minidor Force Bajaj engine mount through a combination of Finite Element Analysis (FEA) and experimental testing. The study explores the relationship between engine speed and vibration levels, analyzing data collected across a range of 1200 to 3000 RPM, corresponding to frequencies between 20 Hz and 50 Hz. The findings of this thesis reveal that resonance point is found at 34 Hz, which is aligned with the fundamental frequency of the engine mount system. The results indicate that while the engine mount effectively reduces vibrations within a specific operational range, operating at high RPM leads to exceeding permissible vibration levels outlined in ISO 10816-6 standards. Moreover, the FEA model closely correlates with experimental results, in which the maximum acceleration on th passenger is 0.95m/s2 and maximum acceleration for FEA is 2*10^-004 at frequency of 50Hz.Thus,the maximum permissible acceleration for whole human body from ISO 10816-6 standards is 0.8m/s2 though slight variation highlights the need for refined simulation parameters to account for real-world factors such as damping and material imperfections. It is highly recommended to limit the operational RPM, optimizing material and design of engine mount, and mitigating resonance effects for improving the MINIDOR Force Bajaj vibration.