The sound insulation and directivity of the radiated sound from double glazed windows have been measured by different researchers. Previously, airborne sound insulation models have been used to predict the associated measurement results with limited success. In this paper, the importance of accounting for the structure borne sound transmission between two glazing elements via the window frame on the prediction results is demonstrated. The decreased stiffness of the wall cavity as the depth is increased is the reason why sound transmission via the window frame needs to be considered. The reciprocity argument provided by Davy for the prediction of the directivity of sound radiating into a room is validated and it is shown that once the structure borne transmission is considered, an additional weighting term is not needed to compensate for the extra wall collisions which the sound experiences when radiated at grazing incidence.

中文翻译：

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双层玻璃窗的声音辐射的隔音性和指向性

双层玻璃窗辐射的声音的隔音性和指向性已由不同的研究人员进行了测量。以前，机载隔音模型已用于预测相关的测量结果，但效果有限。在本文中，说明了在预测结果上考虑通过窗框在两个玻璃元件之间传递固体声的重要性。随着深度增加，壁腔的刚度降低是需要考虑通过窗框传声的原因。验证了戴维提供的用于预测向房间辐射的声音的方向性的互易性，并且表明一旦考虑了结构传播，