双层结构连续铜纤维材料吸声性能研究

【作者】 王常力； 徐颖； 邹伟仁； 徐宁； 罗璐；

【机构】 西北工业大学航海学院环境工程系；

【摘要】 采用直径分别为0.22mm,0.30mm和0.62mm的铜纤维,制备出纤维多孔材料单层板并组合成双层吸声结构;研究双层板孔隙率,厚度,中空腔深度和后空腔深度等因素对其吸声性能的影响。研究表明,近声源板的前板与远声源板的后板孔隙率不同,其中前板应大于厚板孔隙率,后板的孔隙率影响不大;前板与后板的厚度较大为好;随着中空腔深度的增加,中低频的吸声性能降低,但有利于高频处吸声频带的拓宽;后空腔深度的增加有利于低频性能的改善。更多还原

【Abstract】 Prepare plates of porous material used the copper fibers which the diameter are 0.22 mm,0.3mm and0.62 mm.Then combine them into double layer sound absorbing structure.Study how the porosity,thickness,the depth of the central cavity,the depth of the rear cavity and other factors affect the sound absorption of the double plate.The results show that the porosities of plate near the sound source(fore plate) and plate far from the sound source(back plate) are different.The porosity of fore plate should bigger than back plate,and the porosity of B plate has a little effect.The bigger the thicknesses of fore plate and back plate the better the sound absorption.Increase the depth of the rear cavity is conducive to the improvement of the low-frequency performance.With the increase in the central cavity depth,the sound absorption performance in low frequency of material will reduce.But it is useful to widen the sound absorption bands of material at high frequency.更多还原