制备了一系列三明治式聚氨酯(PU)泡沫夹心板,研究了聚氨酯泡沫的组成和结构与频率响应特性之间的关系.结果表明:聚氨酯泡沫夹心板的灵敏度以及频宽与材料的组成和孔径、孔隙率、开闭孔率、厚度等结构因素以及皮层材料性质有关.芯层聚合物分子组成决定材料的阻尼性能,在很大程度上决定声能的输出;芯层空气含量越高,具有阻尼性质的聚合物含量少,音板灵敏度高;声波经过材料时摩擦阻力小,灵敏度高;材料的反射界面增加,声能损耗增大.
参考文献
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