材料的吸声系数(acoustical coefficient) 声能穿透材料和被材料消耗的性质称为材料的吸声性，评 定材料的吸声性能好坏的主要指标称为吸声系数(α)，即
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采用驻波管法测试材料的吸声系数。
The sound absorption coefficient of the material was tested by standing wave tube method.
混响室是声学专业的实验室用房，它在测量声波无规入射时材料的吸声系数和测量噪声源的声功率级中得到了广泛应用。
In the measurement of sound absorption coefficient in random incidence and determination of sound power levels of noise sources, the reverberation room is used very extensively.
结果表明材料的平均吸声系数和降噪系数分别达0。58和0。60，且材料的中低频吸声性能优良。
The result shows that average absorption coefficient and noise reduction coefficient separately equal to0.58and0.60 and fine property of sound absorption at middle-low frequency.
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