The air flow resistivity of glass wool has been measured in different directions. The glass wool was delivered from the manufacturer as slabs measuring 100 * 600 * 900 mm~3, where the surface 600 * 900 mm~2 was parallel with the conveyor belt used in the manufacturing. Directions in the glass wool are described by a coordinate system with the X axis perpendicular to the conveyor belt, the Z axis in the direction the conveyor belt moves, and the Y axis perpendicular to the two other axes. It was found that the resistivities in the Y and Z directions were equal in all cases. For density 14 ke/m~3 the mean resistivity in the X direction was 5.88 kPa s m~(-2) and in the Y direction 2.94 kPa s m~(-2). For density 30 kg/m~3 the mean resistivity in the X direction was 15.5 kPa s m~(-2) and in the Y direction 7.75 kPa s m~(-2). A formula for prediction of resistivity for other densities is given. By comparing measured values of sound attenuation with results calculated from resistivity data, it is demonstrated that the measured attenuation can be predicted in a simple manner.
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机译:玻璃棉的气流阻力已在不同方向上进行了测量。玻璃棉是从制造商处以尺寸为100 * 600 * 900 mm〜3的平板交付的,其中表面600 * 900 mm〜2与制造中使用的传送带平行。玻璃棉的方向由坐标系统描述,其中X轴垂直于传送带,Z轴垂直于传送带移动,Y轴垂直于其他两个轴。发现在所有情况下Y和Z方向的电阻率均相等。对于密度14 ke / m〜3,X方向的平均电阻率为5.88 kPa s m〜(-2),Y方向的平均电阻率为2.94 kPa s m〜(-2)。当密度为30 kg / m〜3时,X方向的平均电阻率为15.5 kPa s m〜(-2),Y方向的平均电阻率为7.75 kPa s m〜(-2)。给出了用于预测其他密度电阻率的公式。通过将声音衰减的测量值与根据电阻率数据计算出的结果进行比较,可以证明可以以简单的方式预测所测量的衰减。
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