Determining Sound Absorbing and Transmission Loss Properties of Rubbers Used in Automotive Industries

Abstract

Soundis simply a kind energy which sprawls to environment as waves. Sound changespressure at air, water etc. which this detected by ears as sound. At the otherhand noise is a kind of sound which is unpleasant, and undesirable for humans.In automotive industry, noise effects drivers and passengers comfort directly.Because of that, automotive manufacturers consider noise insulation inautomobiles as an important factor for quality. Ethylene Propylene DieneMonomer Rubber (EPDM), Natural Rubber (NR) and Nitrile Rubber (NBR) are one ofthe most used insulation materials in automotive industry. In this study, EPDM,NR and NBR materials sound absorption coefficient and sound transmission lossare measured with impedance tube for investigate these materials as insulationpart placed between passenger cabin and engine side on shifter mechanisms.Measurements repeated three times and results showed at graphics. Results arewhich obtained from tests are presented systematically in this study. In conclusion,studyresults showed that EPDM is slightly better than NR and NBR as material ofnoise insulation part at shifter mechanisms.