The Ranking of Major Noise Sources of a Multi Cylinder Diesel Engine

The internal combustion engine has become a prime source of mechanical power. In modern times, petrol and diesel engine-powered vehicles find wide application in the field of transport and agriculture. However, the progress has resulted in newer problems of different type of pollution problems like air and noise Pollution. Noise pollution is because of unwanted sound from engine structure, intake and exhaust are the principal sources of noise pollution & components. In the present problem, we have studied mechanical-induced and Areo Dynamic noise. Mechanical noise refers to noise generated by the vibrating surface of the engine structure, engine components and engine accessories after excitation by reciprocating or rotary engine components. In the present study, we are working on identification of the following engine sources: 1.Engine Structural Noise 2.Fuel Pump 3.Oil Pan 4.Air Suction Noise 5.Exhaust Noise These four noise sources like Fuel pump, oil pan,Suction noise and Exhaust noise were isolated through wooden/plastic/steel ducts for an 80.85 kW diesel engine coupled with a hydraulic dynamo meter at different speeds and load conditions. The results were compared with the overall/Structural sound pressure level (SPL).The SPL of engine sources like oil Pan, oil pump, Suction & exhaust are also plotted to show the ranking of all sources and also checked the impact of speed and load on noise ranking of the components.