Kajian Eksperimental Pengaruh Medan Magnet terhadap Kebisingan pada Knalpot Mobil Toyota Kijang Bensin

Abstract

The topic of this study is focused on the noise produced by the silencer of vehicle which can be very dangerous for our health especially for the health of those who live in urban areas. There have been many studies on how to reduce the noise of produced by the silencer of vehicle conducted by the experts using various research methods such as by changing the construction form or by changing the material that can be used to reduce the noise produced by the silencer of the vehicle. In this research, the writer conducted a study on how to reduce the noise produced by the silencer of a vehicle using magnet force and to examine the ability of magnet force to reduce the noise produced by the silencer of Toyoto Kijang 7K by comparing the ability of magnet force to that of composite silencer of the same size and standard in reducing the noise produced by the silencer of Toyota Krjang 7K. The composite was made of the Rockwool fibers and polyester resins (thermosetting) using the handJay up method. The study was conducted in a laboratory using the laboratory equipment such as sound pressure level meter, engine tune-up tester (Okuda Koki ea-800a), Fluxmeter and Multimeter. The data of this study (the noise) was obtained through the hemispherical method with the distance of one meter from the silencer and divided into four point. The noise measurement was done in the pivots of X+, X-, Y+ and Z- at each point by Sound Pressure Level Meter. The other data taken were the temperature and the velocity of exhaust gas flow on all of the four point. The data obtained were analyzed through the software of Microsoft Excel. The result of this study shows that magnetic field can influence the level of the noise produced by a standard-type silenser. The highest reduction of noise level (3.99 % : 1.14 dB) occurred in a standard-type silencer by using a one ampere electric current when the position of magnet was on selected point (in let) silencer. Magnetic field installed in the composite silencer did not reduce the noise level