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Sound transmission through finite rib-stiffened and orthotropic plates

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Rib-stiffened plates are commonly employed for reasons of weight and static stiff ness. Unfortunately, attaching stiffeners to a plain plate generally increases its radiation efficiency and reduces its airborne sound insulation. This contribution aims at gaining insight into the sound insulation performance of finite-sized rib-stiffened plates through numerical modeling, with a particular focus on finding a physical explanation for the experimental observation that the narrow-band sound transmission loss may oscillate heavily with frequency in the mid-frequency range. To this end, finite element models of a rib-stiffened plate with various levels of detail are constructed and coupled to a reverberant model of the adjoining rooms within the hybrid finite element - statistical energy analysis framework. In this way, the room models are computationally very efficient, the coupling loss factors are computed in a rigorous, straight forward way, and the model predictions are robust with respect to random wave scattering in the rooms. The plate models are calibrated by low-frequency modal testing and the room-plateroom models are validated against narrow-band laboratory measurements. It is shown that the low-frequency calibration can result in more accurate predictions across the entire building acoustics frequency range, that the mid-frequency oscillations of the sound transmission loss are caused by the modal behavior of the plate, that the oscillations can also occur in finite orthotropic plates and that the oscillation dips appear at specific natural frequencies of the plate, where (semi-discrete) coincidence or (semi-discrete) semi-coincidence occurs.
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Document Type: Research Article

Publication date: November 1, 2016

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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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