Reverberation chamber measurement of theatre chair absorption

J.S. Bradley

Abstract


In most auditoria, theatre chairs and their occupants are the major source of sound-absorbing material. Knowledge of their sound-absorbing properties is critical to the acoustical design of an auditorium. Although the effects of the chairs and their occupants were first predicted in terms of the total absorption per chair, Beranek has suggested that it is better to describe the effects in terms of the absorption coefficients of the audience seating areas. The results of reverberation chamber tests on small samples are used to estimate the sound absorbing-properties of materials in rooms. Such tests have been found to overestimate the effects of standard porous absorbing materials due to both edge absorption and diffraction effects. For these simple materials, the measured absorption coefficients have been found to relate approximately linearly to the ratio of perimeter/area, of the samples

Keywords


acoustic wave absorption; architectural acoustics; porous materials; reverberation; theatre chair; sound-absorbing properties; absorption coefficients; reverberation chamber tests; porous absorbing materials

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