ゴム・ウレタンからなる自動車用防音材の遮音性能解析

抄録

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.