Vibration Analysis on an Automobile Muffler

SEMINAR ON AUTOMOBILE MUFFLER

A muffler is a part of the exhaust system on 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. A muffler that affects an automobile in a negative way is one that causes noise or discomfort while the car engine is running. In order to determine the modes most at risk of adversely affecting an automobile, an impact test was conducted.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 0 Hz to 1000 Hz could be collected. The force was caused manually by a hammer with a hard head. After collecting the data, the transfer functions were plotted using Matlab. To ensure correct analyzation, the transfer function equivalent graphs were also plotted. The data was put into an Excel table and analyzed. Six points on the muffler were chosen, after looking at the data, and determined to be under damped.Therefore, our design study suggests to increase the mass, increase the damping, or provide a negative stiffness to make the muffler more damped and to lower the modes of the transfer function. Once at least one of these tasks is performed, the damping will be lowered and there ought to be no more dangerous modes that could lead to excess noise and vibration.

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