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浅析玻璃棉的吸声性能
来源:/ 日期:2018-10-19 发布人:admin

离心玻璃棉对动静中高频有较好的吸声功用。影响离心玻璃棉吸声功用的首要要素是厚度、密度和空气流阻等。密度是每立方米材料的重量。空气流阻是单位厚度时材料两边空气气压和空气流速之比。空气流阻是影响离心玻璃棉吸声功用最重要的要素。

Centrifugal glass wool has good sound absorption function for high and high frequency. The main factors affecting the sound absorption function of centrifugal glass wool are thickness, density and air flow resistance. The density is the weight of the material per cubic meter. Air flow resistance is the ratio of air pressure and air velocity on both sides of a material at unit thickness. Air flow resistance is the most important factor affecting the sound absorption function of centrifugal glass wool.

1、跟着厚度增加,中低频吸声系数显著地增加,但高频改动不大(高频吸收总是较大的)。

  1. With the increase of thickness, the sound absorption coefficient of medium and low frequency increases significantly, but the high frequency does not change much (high frequency absorption is always large).

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2、厚度不变,容重增加,中低频吸声系数亦增加;但当容重增加到必定程度时,材料变得密实,流阻大于最佳流阻,吸声系数反而下降。关于厚度逾越5cm的容重为16Kg/m3的离心玻璃棉,低频125Hz约为0.2,中高频(>500Hz)的吸声系数现已接近于1了。当厚度由5cm继续增大时,低频的吸声系数逐渐前进,当a厚度大于1m以上时,低频125Hz的吸声系数也将接近于1。

2. When the bulk density increases to a certain extent, the material becomes compact, the flow resistance is greater than the optimal flow resistance, and the sound absorption coefficient decreases. Concerning centrifugal glass wool with a density of 16 Kg/m3 and a thickness of more than 5 cm, the sound absorption coefficient of low frequency 125 Hz is about 0.2, and medium and high frequency (>500 Hz) is close to 1. When the thickness increases from 5 cm, the sound absorption coefficient of low frequency gradually advances, and when the thickness of a is more than 1 m, the sound absorption coefficient of low frequency 125 Hz will be close to 1.

离心玻璃棉的吸声功用还与设备条件有着亲近的联系。当玻璃棉板背面有空气层时,与相同厚度无空气层的玻璃棉板吸声效果类似。尤其是中低频吸声功用比材料实贴在硬底面上会有较大前进,吸声系数将随空气层的厚度增加而增加,但增加到必定值后效果就不显着了。

The sound absorption function of centrifugal glass wool is also closely related to the equipment conditions. When there is an air layer on the back of the glass wool board, the sound absorption effect is similar to that of the glass wool board without air layer of the same thickness. Especially, the sound absorption function of medium and low frequency will go forward more greatly than that of the material on the hard bottom. The sound absorption coefficient will increase with the thickness of the air layer, but the effect will not be significant when it is increased to a certain value.

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