慢回弹聚氨酯发泡体吸声性能研究

Sound Absorbing Properties of Slowly-recoverable Polyurethane Foam

对不同泡孔大小、不同厚度慢回弹聚氨酯材料在不同频段下的吸声性能进行实验研究 .研究表明 ,130 0μm是材料泡孔大小对吸声性能影响的转折点 .对于低频声波 ,泡孔直径为 130 0 μm时 ,吸声性能最好 ;对中高频声波 ,吸声效果最差 .材料厚度对吸声性能的影响 ,6 cm为最优值 ,此时材料的吸声效果最好 ;材料对不同频段声波的吸收效果也各不相同 ,频率为 10 0 0 Hz声波的吸收效果最差 ,此频率是材料吸声性能的低谷 .以上研究结果为工程使用提供了有价值的实验依据 .

The impedance property of polyurethane foam is studied.Different foam pore dimension,material thickness and four frequency scopes are considered in.It is shown that 1 300 μm is the critical pore dimension,the material with this pore dimension has best impedance effect in low frequency and has worst impedance effect in middle and high frequency.About material thickness,6 cm is perfect.The material impedance property varies according to the frequency of sound,and 1 000 Hz sound has the worst absorbing effect.