Abstract A novel porous copper fiber sintered sheets (PCFSSs) with different porosities were fabricated using the cutting copper fibers with rough surface. The effect of fiber surface morphology, porosity, thickness and gradient pore structure of PCFSS on sound absorption performance was tested by using the transfer function method. Our results show that the copper fiber sintered sheets with rough surface exhibited better sound absorption performance compared with the copper fiber sintered sheets with smooth surface. The increase of sound resistance by increasing thickness or decreasing porosity could significantly improve the sound absorption coefficients in the low frequency region and widen its acoustic absorption bandwidth. Whereas, the sound absorption performance in the high frequency region was decreased with the increase of sound resistance. Moreover, the three-layer PCFSSs with gradient pore structure could cause a repeated propagation and dissipation due to the reflection of sound waves between the gradient interfaces, which can satisfy the requirements of noise control in different frequency region. Our work provides a method for improving sound absorption performance of porous metal material for different applications.

中文翻译：

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粗糙表面多孔铜纤维烧结板的设计、制作及吸声性能研究

摘要 利用切割粗糙表面的铜纤维制备了一种具有不同孔隙率的新型多孔铜纤维烧结板（PCFSSs）。采用传递函数法测试了PCFSS的纤维表面形貌、孔隙率、厚度和梯度孔隙结构对吸声性能的影响。结果表明，与表面光滑的铜纤维烧结板相比，表面粗糙的铜纤维烧结板具有更好的吸声性能。通过增加厚度或减少孔隙率来增加声阻可以显着提高低频区域的吸声系数并加宽其吸声带宽。然而，高频区的吸声性能随着声阻的增加而降低。此外，具有梯度孔结构的三层PCFSS由于声波在梯度界面之间的反射会引起重复传播和耗散，可以满足不同频率区域的噪声控制要求。我们的工作提供了一种提高多孔金属材料在不同应用中的吸声性能的方法。