A tentative method for the measurement of indirect sound transmission in buildings
This paper describes a new method of measuring the direct and indirect components of an airborne sound field radiated from a source room directly through the party wall (or floor) and indirectly via the flanking solid structures to the receiving room. The amplitude and its distribution on all the surfaces of the receiving room are determined using small piezoelectric accelero-meters, vibration measurement at six points of each wall being sufficient in the case of statistical sound fields. The airborne sound source is then replaced by vibration transmitters attached to the walls of the source room which are adjusted in position, number and amplitude of vibration such that the pattern and amplitudes of normal vibration of all the surfaces of the receiving room are as similar as possible to those obtained with airborne excitation; three to eight transmitters are sufficient for this purpose. In the next stage the transmitters at the party wall are removed and the sound pressure level in the receiving room is measured. In this way one part of the indirectly transmitted energy can be determined. Continuing in a similar manner the total indirect energy transmitted to the receiving room by different paths can be measured in several steps. The accuracy of the method, which requires improvement, allows measurement of the levels of the important parts of energy with an error of about ± 1.5 db. The results obtained to date in normal buildings confirm that with Sound Reduction Factors of party walls of about 50 db the direct and indirect energy are of the same order of magnitude; above this value indirect transmission is of decisive influence.
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Document Type: Research Article
Publication date: January 1, 1951
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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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