Exposure to prolonged or excessive noise has been shown to cause a range of health problems. In this study, flexible sandwich composites (FSCs) with excellent sound absorption and mechanical properties were designed and fabricated by a one-step foaming process. The compound fabric as composite panel and fabric sequence contacted with PU foam has been designed and optimized for excellent cushioning and sound absorption properties. In comparisons of three processing methods for fabricating compound fabrics as reinforced panels of FSCs, punching/hot pressing was found to be the most effective method. Through experiments, the L (low-melting polyethylene terephthalate nonwoven fabric, LPNF) -W (warp-knitted spacer fabric, WKSF) -F (flexible polyurethane foam, FPF) composites had the best performance, reaching the sound absorption coefficient of 0.997 (1000 Hz), 107.77 KPa in compression modulus, 6541 N in maximum impact contact force and 44.68% in impact energy absorption. Morphological study revealed that the transition region formed by FPF and WKSF played a vital role in the L-W-F structure. In that region, small cavities and complex porous paths were observed that effectively improved the sound absorption and cushioning properties by dissipating the stress wave and sound wave level-to-level.

长期或过度的噪音暴露会导致一系列健康问题。在这项研究中，通过一步发泡工艺设计和制造了具有优异吸声和机械性能的柔性夹芯复合材料（FSC）。复合面料作为复合面板和与PU泡沫接触的面料序列经过设计和优化，具有出色的缓冲性和吸声性能。通过比较三种制造复合织物作为FSC增强板的加工方法，发现冲压/热压是最有效的方法。通过实验，L（低熔点聚对苯二甲酸乙二酯无纺布，LPNF）-W（经编间隔织物，WKSF）-F（软质聚氨酯泡沫，FPF）复合材料具有最佳性能，吸声系数达到0。997（1000 Hz），压缩模量为107.77 KPa，最大冲击接触力为6541 N，冲击能量吸收为44.68％。形态学研究表明，FPF和WKSF形成的过渡区在LWF结构中起着至关重要的作用。在该区域，观察到小空腔和复杂的多孔路径，通过逐级消散应力波和声波，有效地改善了吸声和缓冲性能。