Sound Insulation Analysis of Porous Media Using Urethane and rubber

Abstract

The performance enhancement of the acoustic insulation is demanded for the high frequency for interior noise of automobile. We took a waffle shape on the urethane surface to improve sound insulation in the acoustic insulation of the type that laminated a rubber sheet to urethane and examined a change of the acoustic. We tested it using a simple sound insulation performance measurement device and compared it with the vibration sound analysis result using the finite element model. Urethane used Biot model and used the parameter that I measured separately by the calculation. In addition, it was and, in the case of sound input and vibration input, calculated a change of the sound performance by difference in waffle shape (rib width, rib interval). As a result, in a certain frequency band, We were able to confirm that sound insulation performance improved.