Analysis of lightweight acoustic reflectors

ACCOLTI, ERNESTO; MIYARA, FEDERICO; PASCH, VIVIAN

Proceedings of Meetings on Acoustics

Acoustical Society of America

Año: 2017 vol. 28

1939-800X

Halls for music performance frequently require the design of acoustic reflectors to redirect the sound waves toward the audience. In order to get adequate reflecting properties the usual criterion is that the surface density be no less than 20 kg/m2. However, this may prove too heavy in certain cases, so other possible solutions must be studied. In this paper, light-weight reflectors, such as medium density fibreboard or plywood panels clamped at their boundaries, where structural rigidity replaces mass at the low frequency end, have been investigated. A compliance model is compared with the mass model showing that the structure is suitable.