Faculty of Architecture and Urban Planning, Chongqing University, Chongqing, China.
Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
J Acoust Soc Am. 2023 Feb;153(2):1361. doi: 10.1121/10.0017353.
The sound transmission across plenum windows installed with rigid non-resonant cylindrical scatterer arrays was investigated in detail using scale-down model measurements carried out inside a fully anechoic chamber. The arrays have manifested to some extent the acoustical behaviors of virtual sonic crystals. The maximum cross section blockage ratio was 0.6. The effects of plenum window gap, array configuration, and scatterer diameter on the sound transmission characteristics were also examined. Results indicate that the window cavity longitudinal modes and the gap modes control the sound transmission characteristics at low frequencies. The upper bound of this frequency range increases with decreasing gap width. Within this frequency range, the scatterers have negligible effect on the sound transmission. At higher frequencies, the array configurations with scatterer(s) attached to the window walls result in stronger sound reduction. There are relatively higher sound transmission loss improvements around the frequencies where a full bandgap is observed. There are wide bandgaps in various lattice directions, and the present results suggest that they play a role in the broadband improvement of sound reduction.
使用全消声室内的缩尺模型测量详细研究了安装有刚性非共振圆柱散射体阵列的静压箱窗的声传输。这些阵列在某种程度上表现出了虚拟声子晶体的声学行为。最大横截面阻塞比为 0.6。还研究了静压箱窗间隙、阵列配置和散射体直径对声传输特性的影响。结果表明，窗口腔纵向模式和间隙模式控制低频时的声传输特性。此频率范围的上限随间隙宽度的减小而增加。在该频率范围内，散射体对声传输的影响可以忽略不计。在较高频率下，将散射体附着在窗壁上的阵列配置会导致更强的降噪效果。在观察到完全带隙的频率附近，声传输损耗的改善相对较高。在各个晶格方向上都存在宽带隙，并且目前的结果表明它们在宽带降噪改善中发挥了作用。
