In order to find a reasonable way to use the waste corn husk, waste degummed corn husk fibers were used as reinforcing material in one type of composite material. And polylactic acid particles were used as matrix material. The composite materials were prepared by mixing and hot-pressing process, and they were processed into the micro-slit panel. Then, the multi-layer structural sound absorption composite materials were prepared sequentially by micro-slit panel, air cavity, and flax felt. Finally, the sound absorption properties of the multi-layer structural composite materials were studied by changing flax felt thickness, air cavity depth, slit rate, and thickness of micro-slit panel. As the flax felt thickness varied from 0 to 10 mm in 5 mm increments, the peak of sound absorption coefficient shifted to low frequency. The sound absorption coefficient in the low frequency was improved with the air cavity depth varied from 0 to 10 mm in 5 mm increments. With the slit rate increased from 3% to 7% in 2% increments, the peak of sound absorption coefficient shifted to high frequency. With the thickness of micro-slit panel increased from 2 to 6 mm in 2 mm increments, the sound absorption bandwidth was broaden, and the peak of sound absorption coefficient was increased and shifted to low frequency. Results showed that the highest sound absorption coefficient of the multi-layer structural composite materials was about 1 under the optimal process conditions.

中文翻译：

---

基于废弃玉米壳纤维的多层结构复合材料的吸声性能

为了找到合理的利用废弃玉米壳的方法，将废弃的脱胶玉米壳纤维作为一种复合材料的增强材料。并以聚乳酸颗粒为基体材料。采用混合热压工艺制备复合材料，加工成微缝面板。然后，采用微缝板、气腔、亚麻毡依次制备多层结构吸声复合材料。最后，通过改变亚麻毡厚度、气腔深度、开缝率和微开缝板厚度，研究了多层结构复合材料的吸声性能。当亚麻毡的厚度从 0 到 10 毫米以 5 毫米的增量变化时，吸声系数的峰值向低频移动。随着气腔深度从 0 到 10 mm 以 5 mm 为增量变化，低频吸声系数得到改善。随着狭缝率以2%的增量从3%增加到7%，吸声系数的峰值向高频移动。随着微缝板的厚度从2mm增加到6mm，以2mm为增量，吸声带宽变宽，吸声系数峰值增大，向低频移动。结果表明，在最佳工艺条件下，多层结构复合材料的最高吸声系数约为1。吸声系数的峰值向高频移动。随着微缝板的厚度从2mm增加到6mm，以2mm为增量，吸声带宽变宽，吸声系数峰值增大，向低频移动。结果表明，在最佳工艺条件下，多层结构复合材料的最高吸声系数约为1。吸声系数的峰值向高频移动。随着微缝板厚度从2mm增加到6mm，以2mm为增量，吸声带宽变宽，吸声系数峰值增大，向低频移动。结果表明，在最佳工艺条件下，多层结构复合材料的最高吸声系数约为1。