Study On Noise Attenuation Of Multi-Cylinder Diesel Engine With Existing And Modified Muffler

摘要

Man's desire for pollution free atmosphere needs control of air pollution and noise pollution. The principal sources of noise in automotive engines are intake noise, radiator noise, combustion noise, exhaust noise etc. Out of these exhaust noise is predominant and it is to be controlled. Noise pollution affects human beings physiologically and psychologically. The cardiac patient may get cardiac arrest due to excessive dose of noise for a longer period of time. In this paper one reactive muffler for a multi-cylinder diesel engine is designed and modified. More attenuation is given by making some changes in its configurations. The Bond graph technique has been applied for the analytical results of the muffler. The modeling of acoustics and other systems are easily and logically achieved through BOND GRAPH. Bond graph is invented by Paynter and is a method of representation of physical system by means of symbols and lines, identifying power flow paths and lumped parameter elements of resistance, capacitance and inductance. The Bond graph model is created by taking wave propagation in acoustic material into consideration. The analysis of Bond Graph model was carried out by using software COSMO-KGP. These results were compared with the experimental results and are found to be in close agreement.