复合共振吸隔声屏障设计与性能研究

Study of Design and Performance of Composite Resonance Absorption Barrier

为解决采用无机纤维类多孔吸声材料声屏障存在低频效果差的问题,开发了一种由微穿孔板、共振板、阻尼层加镀锌钢板组成的复合共振吸隔声屏障,并基于仿真分析和实验探讨了材料孔径、组合结构、使用环境等对新型复合共振吸隔声屏障的隔吸声性能的影响。开发出的双层和三层复合共振组合材料在厚度10 cm时对500 Hz及以下频率的平均吸声系数分别可达0.48~0.64,0.49~0.72,100 Hz时吸声系数可达0.18~0.34,0.20~0.38;双层和三层复合共振组合材料在63~1 600 Hz的1/3倍频带的平均隔声量分别可达11.37~15.30 dB(A),13.71~21.33 dB(A)。该复合共振吸隔声屏障与常用材料相比,在成本基本相同的情况下,对变电站低频噪声的隔声和吸声性能均有了较大提高,并且材料更环保、耐腐蚀,便于施工和维护。

In order to solve the poor low frequency effect in the sound barrier with inorganic fiber porous material, a composite resonance absorption barrier consisting of micro perforated plate, resonance plate, damping layer and galvanized steel plate is developed. The influence factors of material aperture, composite structure and environment are discussed on the basis of simulation analysis and experiment. When the thickness is 10 cm, the average sound absorption coefficient of double and three layer composite resonances for 500 Hz and below frequency can reach 0.48~0.64 and 0.49~0.72 respectively, the sound absorption coefficient of 100 Hz can reach 0.18~0.34 and 0.20~0.38 respectively. And the average sound insulation of double and three layer composite resonances can reach 11.37~15.30 dB(A) and 13.71~21.33 dB(A) respectively in 1/3 times band of 63~1 600 Hz. Compared with the common materials, the composite resonance absorption barrier has greatly improved the sound insulation and sound absorption performance of the low frequency noise in the substation, and the material is more environmentally friendly and corrosion-resistant, so it is convenient for construction and maintenance.