Wave Based Modeling of the Sound Insulation of Double Walls With Structural Connections

作者：Dijckmans A^*

来源：Acta Acustica United with Acustica, 2017, 103(3): 465-479.

DOI：10.3813/AAA.919076

In this paper, a wave based model is developed for the investigation of the direct sound transmission through double walls with structural connections placed between two rooms. The modal behaviour of the rooms and the structure is taken into account. Point and line connections with an increasing degree of complexity are introduced in the double wall model to incorporate the effect of structure-borne paths. The studs and ties are modeled as rigid connections or a combination of translational and rotational springs. Alternatively, the studs are modeled as beams, accounting for the modal behaviour of the studs. The wave based results are compared with experiments and infinite plate models based on a decoupled approach or a periodic approach. It is shown that the finite dimensions can have a significant influence on the sound insulation, both at low frequencies and at higher frequencies. The pass- and stop-band behaviour predicted for periodic structures cannot fully develop in finite double walls. Furthermore, the stud spacing can influence the resonant behaviour of the TL at low and mid frequencies, but has limited effect at higher frequencies.

• 出版日期2017-6