Design and Development of Automobile Silencer for Effective Vibration and Noise Control

A Silencer is a part of the exhaust system of an automobile that plays a vital role. It needs to have modes that are located away from the frequencies that the engine operates at, whether the engine be idling or running at the maximum amount of revolutions per second. The purpose of the design project performed was to determine which modes are very high and may affect the automobile adversely while in operation. Research was performed prior to the test to determine which frequencies to look for modes at. It was determined to conduct the experiment so data from 20 Hz to 20 KHz could be collected. The force was generated by running the engine at different speed. Acceleration is measured by using FFT analyzer by selecting the points on the Silencer were chosen, after looking at the data and determined to be under damped. Therefore, our design study suggests increasing the mass, increase the damping, or providing a negative stiffness to make the silencer more damped. The purpose of this report is also to the study the harmful effects of noise caused by it on Engine. 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 vibration is one of the major source of noise in vehicles. So, it is necessary to study noise generated by four stroke petrol engine. The study of noise generated by four stroke petrol engine is carried out with or without mufflers to check the effectiveness of the muffler.