A STUDY OF NOISE SOURCE LOCALIZATION IN MOTORCYCLES

In civilized and developing countries, the number of the motorcycles in transportation systems are increasing day by day. With the growing demand of the motorcycles, the noise caused by these vehicles has constituted an important role in the noise pollution. On the other hand, the drivers are suffering from the permanent damages that are generated by the motorcycle noise. For overcoming these drawbacks, the first necessary is to determine the noise sources in motorcycles. The purposes of this study are the determination of the noise sources in motorcycles by sound intensity method and investigation of the effects of the motorcycle noises on the drivers. Firstly, sound levels were measured at idle mode and at three different engine speeds for two types of motorcycles by using the sound intensity probe. Besides these measurements, the sound levels were also captured at the ear level with and without a helmet. Then the results were analyzed by taking into the consideration of the engine size, helmet usage and driving speed.