Study of Noise Generated by Single Cylinder Two Stroke Petrol Engine

Abstract

In our modern world, rapidly expanding environment one of the developing problems is that of “Noise”. The purpose of this report is to the study the harmful effects of noise on human beings. In India, the transportation sector is growing rapidly and number of vehicles on Indian roads is increasing at very fast rate. This has lead to overcrowded roads and noise pollution. Engine noise is one of the major source of noise in vehicles. So, it is necessary to study noise generated by two stroke petrol engine at different speeds and loads. First the sound pressure level is measure in dB(A) near the engine at four different locations at distance of 0.5m from centre of each side of an engine to find out that location where sound pressure level is maximum. Sound power is calculated using rectangular parallelepiped at different speeds and loads. Vibration analysis has been carried out to measure acceleration and velocity at that location where sound pressure level is maximum. Frequency spectrum analysis is done to measure sound pressure level in 1-1 octave band. The study of noise generated by two stroke petrol engine is carried out with or without mufflers to check the effectiveness of the muffler. There are three different types of mufflers used in this study out of which two are reflective type of muffler and one is hybrid type of muffler. It is found that the best muffler is of hybrid type.