전기차용 플랫 플로어 적용을 위한 시뮬레이션 기반 다층 구조 흡음재 설계 최적화

• Published in: 한국섬유공학회지, 62(4) pp. 260 - 270
• Main Authors: 정예담, 조성진, 김세종, 이인성
• Format: Journal Article
• Language: Korean
• Published: 한국섬유공학회 01.08.2025
• Subjects: 섬유공학
• ISSN: 1225-1089; 2288-6419

This study aims to develop high-performance acoustic interior materials for flat floor structures in electric vehicles (EVs) by optimizing a multilayer sound-absorbing system composed of TPS composite, PET felt, and PU foam. To enable simulation-based acoustic prediction, fundamental material properties were first evaluated. The sound absorption coefficient was measured using the impedance tube method, while bulk density and open porosity were obtained via Phi-X analysis. These values were applied in FOAM-X to simulate single-layer absorption behavior and determine the optimal thickness for each material. Based on these results, NOVA software was used to predict the acoustic performance of multilayer structures. Among the design cases, the #2 configuration (TPS 2T / PET felt 10T/PU foam 20T) showed the most stable and efficient absorption in the midto-high frequency range. A prototype based on this configuration was fabricated, and its sound absorption was evaluated using an Alpha cabin test. The comparison showed that in the 400–4,000 Hz range, Alpha cabin measurements exhibited higher absorption coefficients than NOVA simulations, mainly due to micro-pore changes during forming and edge effects of the setup, while results above 4,000 Hz remained stable and demonstrated meaningful accuracy. This confirms the reliability of simulation-based acoustic design and demonstrates its applicability to eco-friendly EV interior components. KCI Citation Count: 0