木质纤维/聚酯纤维复合材料吸声性能的试验分析

Experimental Study on Sound Absorption of Wood Fiber/Polyester Fiber Composite Materials

木质纤维/聚酯纤维复合吸声材料为多孔纤维材料,利用阻抗管测量其吸声系数,探讨了密度、厚度、空气流阻率、背后空腔深度、针刺处理工艺及贴面处理对其吸声性能的影响.结果表明:在试验范围内,密度为0.2g/cm3,空气流阻率为1.98×105 Pa·s/m2的木质纤维/聚酯纤维复合材料具有较好的吸声性能;增加厚度或背后空腔深度,木质纤维/聚酯纤维复合材料的声波吸收峰往低频方向移动;对于密度大的木质纤维/聚酯纤维复合材料,针刺处理工艺能明显提高其吸声性能;贴面材料的使用可降低木质纤维/聚酯纤维复合材料的吸声性能.

Acoustic absorption coefficient of wood fiber/polyester fiber composite material as a porous material was studied.Six factors influencing the sound absorption performance of the composite material including density,thickness,air cavity depth behind the composite material,flow resistance rate,treatment technology were investigated.Results show that：within the scope of the test,when the density of the composite material is 0.2g/cm3 and the air flow resistance rate is 1.98×105 Pa·s/m2,it has good sound absorption performance.With increasing thickness of the composite material or increasing depth of the cavity behind,sound absorption peak moves to the low frequency;if the composite material becomes denser by treated with needling process,the sound absorption performance enhances obviously;the sound absorption properties of composite materials are reduced by covering the facing material in some extent.