ASTM E966建筑物表面和表面构件气载声音隔离的现场测量标准指南
日期:2012-02-08 11:52
he sound is not incident normal to the surface. Additionally, when the sound of level L arrives as a free-field from one direction only, and that is normal to the surface, the resulting sound intensity in this direction is 4 times that due to diffuse-field sound of the same level, L. These factors are reflected by the cos() and 6 dB terms in Eq 6.
5.3.3 The methods in this guide should not be used as a substitute for laboratory testing in accordance with Test Method E90.
5.4 Of the three methods
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