Wave Based Modeling of the Sound Insulation of Double Walls With Structural Connections
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.
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Document Type: Research Article
Publication date: May 1, 2017
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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