NOISE.& EMISSION PREDICTION FROM BIO DIESEL ENGINE BY NEURAL NETWORK APPROACH

Abstract

Engine is the most common and important component in all the vehicles. An improved understanding of noise signal is required for the early detection of incipient engine component failure to achieve high reliability. In diesel engine, the combustion noise is so named to distinguish it from the noise of mechanical sources in the engine such as the valve train, fuel injection system and timing gears. On the other hand, piston slap is a combination of combustion and mechanical sources within the engine, and is not straightforward one. However, the aim of the present work is to separate the noise contributions of combustion and mechanical (motored) sources The objectionable noise of a diesel engine or `diesel knock' is produced by the abrupt rise of cylinder pressure resulting from initial inflammation of the injected fuel. Worth-while reductions of this noise have been achieved by the control of the fuel injection characteristics producing a smoother pressure rise, but these are limited by performance considerations. Further reductions can only be obtained by structural changes of the engine. The American Society for Testing and Materials (ASTM) define biodiesel fuel as monoalkyl esters of long chain fatty acids derived from a renewable lipid feedstock, such as _ vegetable oil or animal fat. "Bio" represents its renewable and biological source in contrast to traditional petroleum based diesel fuel; "diesel" refers to its use in diesel engines. As an alternative fuel, biodiesel can be used in neat form or mixed with petroleum-based diesel. Biodiesel, as an alternative fuel, has many merits. It is derived from a renewable, domestic resource, thereby relieving reliance on petroleum fuel imports. It is biodegradable and non-toxic. Compared to petroleum-based diesel, biodiesel has a more favourable combustion emission profile, such as low emissions of carbon monoxide, particulate matter and unburned hydrocarbons. The most common way to produce biodiesel is by transesterification.