Sound and Thermal Insulation Performance of Large-Gap Warp-Knitted Spacer Fabric Reinforced Inflatable Membrane Materials
摘要
The mitigation of noise pollution necessitates the development of high-performance materials. Large-gap warp-knitted spacer fabrics (LWSFs) have emerged as promising candidates due to their tunable structural characteristics and favorable mechanical properties. In this study, we fabricated large-gap warp-knitted spacer fabric-reinforced inflatable membrane materials (LWSFRIMs) with varying thicknesses, and systematically investigated the influence of internal air pressure and material thickness on their acoustic and thermal insulation performance. The findings reveal that sound insulation is primarily governed by a sound bridge mechanism. In the mid-to-high frequency range, lower internal air pressures enhance sound insulation by allowing the spacer filaments to remain in a relaxed state, thereby effectively reducing vibration transmission. Increasing the inter-fabric gap raised the weighted sound reduction index