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The Influence of Stiffeners on the Sound Radiation and the Transmission Loss of Metal Walls

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Sound transmission loss and the radiation factor of three walls were measured, the walls consisting of aluminium, 4 mm thick, covering an area of 9.2 m2. They were installed between two reverberant chambers. One of the walls was not stiffened, the second had been stiffened by parallel ribs and the third by cross-connected ribs. All measurements as stated above were repeated after covering the three walls with a damping layer. Excitation of the walls with airborne sound as well as point excitation was investigated. Below the critical frequency, the resulting differences in transmission loss of the three walls amount up to 9 dB. They reduce to 4 dB when the walls are covered with the damping layer. Hence, with damping the transmission loss of the stiffened walls increases more than that of the unstiffened one. Below the critical frequency, the differences in transmission loss are due to radiation as well as excitation qualities. Radiation with point excitation depends very little on damping, but considerably on the extent to which the walls are stiffened.
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Document Type: Research Article

Publication date: July 1, 1973

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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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