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
d will increase with reducing to be considerably above the diffuse-field frequency when is 30 or less. Wood panels (that is, doors) and masonry walls exhibit lower coincidence frequencies while sheet steel exhibits higher coincidence frequencies.
5.3.2 The OINR is influenced by the angle of incidence of free field sound coming from a specific angle as compared to a diffuse field. This is because the intensity of free field sound incident across the specimen surface S is reduced by cos() when t
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11/07 14:53