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
1) . All of these results are a function of the angle of incidence of the sound for two reasons.
5.3.1 The transmission loss is strongly influenced by the coincidence effect where the frequency and projected wavelength of sound incident at angle, , coincides with the wavelength of a bending wave of the same frequency in the panel (2, 3, 4, 5). This frequency and the angle of least transmission loss (greatest transparency) both depend on specimen panel stiffness, damping and area mass. In diffuse
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11/06 21:24