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华美橡塑济南代理:玻璃棉吸声功能介绍

发布时间:2024-03-20 来源:http://www.hmbwcl.cn/

离心玻璃棉对声响中的高频有较好的吸声功能。影响离心玻璃棉吸声功能的主要因素是厚度、密度和空气流阻等。密度是每立方米资料的重量。空气流阻是单位厚度时资料两侧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能重要的因素。流阻太小,说明资料稀疏,空气振荡简单穿过,吸声功能下降;流阻太大,说明资料密实,空气振荡难于传入,吸声功能亦下降。关于离心玻璃棉来讲,吸声功能存在流阻。

Centrifugal glass wool has good sound absorption function for high frequencies in sound. The main factors affecting the sound absorption function of centrifugal glass wool are thickness, density, and air flow resistance. Density is the weight of data per cubic meter. Air flow resistance is the ratio of air pressure and air velocity on both sides of the data per unit thickness. Air flow resistance is an important factor affecting the sound absorption function of centrifugal glass wool. The flow resistance is too small, indicating sparse data, simple air oscillation passing through, and decreased sound absorption function; If the flow resistance is too high, it indicates that the data is dense, air oscillation is difficult to enter, and the sound absorption function is also reduced. Regarding centrifugal glass wool, there is flow resistance in its sound absorption function.

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在实践工程中,测定空气流阻比较艰难,但可以通过厚度和容重粗略估计和控制。

In practical engineering, measuring air flow resistance is relatively difficult, but it can be roughly estimated and controlled through thickness and bulk density.

随着厚度增加,中低频吸声系数显著地增加,但高频变化不大(高频吸收总是较大的)。

As the thickness increases, the sound absorption coefficient at medium and low frequencies significantly increases, but there is not much change at high frequencies (high frequency absorption is always large).

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,资料变得密实,流阻大于流阻,吸声系数反而下降。关于厚度超过5cm的容重为16Kg/m3的离心玻璃棉,低频125Hz约为0.2,中高频(>500Hz)的吸声系数已经接近于1了。当厚度由5cm继续上涨时,低频的吸声系数逐渐提高,当厚度大于1m以上时,低频125Hz的吸声系数也将接近于1。当厚度不变,容重上涨时,离心玻璃棉的低频吸声系数也将不断提高,当容重接近110kg/m3时吸声功能达到较大值,50mm厚、频率125Hz处接近0.6-0.7。容重超过120kg/m3时,吸声功能反而下降,是因为资料变得细密,中高频吸声功能受到很大影响,当容重超过300kg/m3时,吸声功能减小很多。修建声学中常用的吸声玻璃棉的厚度有2.5cm、5cm、10cm,容重有16、24、32、48、80、96、112kg/m3。通常使用5cm厚,12-48kg/m3的离心玻璃棉。

The thickness remains unchanged, the bulk density increases, and the sound absorption coefficient at medium and low frequencies also increases; But when the bulk density increases to a certain extent, the data becomes dense, the flow resistance is greater than the flow resistance, and the sound absorption coefficient actually decreases. Regarding centrifugal glass wool with a bulk density of 16Kg/m3 and a thickness exceeding 5cm, the low-frequency 125Hz is about 0.2, and the sound absorption coefficient at medium and high frequencies (>500Hz) is close to 1. As the thickness continues to increase from 5cm, the low-frequency sound absorption coefficient gradually increases. When the thickness is greater than 1m, the low-frequency sound absorption coefficient at 125Hz will also approach 1. When the thickness remains unchanged and the bulk density increases, the low-frequency sound absorption coefficient of the centrifugal glass wool will also continue to increase. When the bulk density approaches 110kg/m3, the sound absorption function reaches a larger value, and at a thickness of 50mm and a frequency of 125Hz, it approaches 0.6-0.7. When the bulk density exceeds 120kg/m3, the sound absorption function actually decreases because the data becomes more detailed, and the medium and high frequency sound absorption function is greatly affected. When the bulk density exceeds 300kg/m3, the sound absorption function decreases significantly. The thickness of sound-absorbing glass wool commonly used in construction acoustics is 2.5cm, 5cm, and 10cm, with bulk densities of 16, 24, 32, 48, 80, 96, and 112kg/m3. Typically, 5cm thick, 12-48kg/m3 centrifugal glass wool is used.

离心玻璃棉的吸声功能还与安装条件有着密切的联系。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作用类似。尤其是中低频吸声功能比资料实贴在硬底面上会有较大提高,吸声系数将随空气层的厚度增加而增加,但增加到必定值后作用就不显着了。

The sound absorption function of centrifugal glass wool is also closely related to installation conditions. When there is an air layer on the back of the glass wool board, the sound absorption effect is similar to that of glass wool boards with the same thickness but no air layer. Especially, the sound absorption function at medium and low frequencies will be significantly improved compared to data pasted on a hard bottom. The sound absorption coefficient will increase with the thickness of the air layer, but the effect will not be significant when it reaches a certain value.

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This article is contributed by Huamei Rubber Jinan as an agent for friendship. For more related knowledge, please click on http://www.hmbwcl.cn Sincere attitude. We will provide you with comprehensive service. We will gradually contribute more relevant knowledge to everyone. Stay tuned



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