Abstract
The sound absorption characteristics of the single and multi layered porous materials are studied with the help of impedance tube. In Impedance tube standing wave and transfer function methods are used more for its accuracy and reliability. The standing wave method is simple and transfer function method is accurate. The materials are tested for its sound absorption co-efficient. The standing wave method is used in this study. The results are compared with the existing tube. The two different samples are compared with existing tube. The results are analyzed.
Highlights
One of the major problems faced by the people using automotives is noise pollution
The readings obtained by the tube is compared with the existing Impedance tube for accuracy.The data from Table 2 describes the deviation between the readings of both the tubes for density 80 kg/m3/25 mm
Audio amplifier circuit: The audio amplifier circuit shown in Fig. 4 is using lm 386 amplifier IC, it is used to amplify the sound source given to the impedance tube
Summary
One of the major problems faced by the people using automotives is noise pollution. The difficult task for the industry is to reduce the noise without increasing the vehicle weight. The controlling of noise in the automotives is done by active and passive methods. In Passive method porous materials like foams, fibres, glass wool either alone or with natural fibres as composites are used. These materials are used in head and trunk liners, door liners and carpets and under roof in the automobile applications. These materials should be considered for not to affect the overall weight of the car. Eng. Technol., 11(2): 185-189, 2015 sound within the tube along one direction towards the direction of propagation.
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