유한요소해석을 이용한 중량충격원 종류 및 평가지표 별 바닥충격음 예측 정확도 검증

Abstract

In this study, we determined the reliability of the finite element method in predicting heavy-weight floor impact sounds after comparing the predicted and measured frequency response functions of vibration and acoustic sounds in full-scale houses. The heavy-weight impact source included a bang machine and rubber ball. For both vibration and acoustic modes, the predicted frequency response functions showed a similar amplitude as the measured ones. However, there was a small difference in their peak frequencies owing to the non-linear characteristics of concrete. The heavy-weight impact sound from the bang machine was predicted to have a 1 dB deviation when compared with the experimental results and a 2.1 dB deviation in total sound pressure level. The deviation between the experimental and simulation results for the rubber ball was 1 dB for impact sound and 0.5 dB in total sound pressure level. The maximum deviation at each frequency was 5 dB and 4 dB for the bang machine and rubber ball, respectively. Overall, the results indicate that the numerical analysis is useful for developing optimized structures to control heavy-weight floor impact sound with different impact sources and evaluation indices.