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handle: 10261/6896
[EN] The classical criterion of Bolt for homogeneous distribution of normal frequencies in rectangular enclosures is revisited. Coincidence of normal frequencies is considered a detrimental factor concerning frequency and spatial regularity in sound response of enclosures. New fundamental facts influencing normal frequency distribution are analyzed and a metric is proposed as an efficient criterion. Merit figures are compared to Bolt's results. New areas of p,q ratios leading to homogeneous distributions in the low frequency range are found. At high frequencies a generally better situation is observed but some values of p and/or q and some ratios p/q lead to clusters and "holes" of normal frequencies causing high scores of transmission irregularity.
[ES] Se presenta un nuevo enfoque del criterio de Bolt sobre distribución homogénea de frecuencias propias en recintos prismáticos. La coincidencia de frecuencias propias se considera un factor clave de deterioro de la regularidad de la transmisión sonora en recintos. Se analizan las causas del espaciado homogéneo de frecuencias propias proponiendo una nueva métrica cuyos resultados se comparan con los de Bolt, localizando nuevas áreas de proporciones p,q con gran homogeneidad de distribución en bajas frecuencias, encontrando para frecuencias superiores que junto a una mejora generalizada, ciertos valores de p, de q, de ambos o de p/q conllevan agrupamientos y vacios de frecuencias propias con detrimento de la regularidad de la transmisión.
6 pp.-- PACS nrs: 43.55.Gx, 43.55.Hy, 43.55.Nd.-- Comunicación presentada en los siguientes congresos: II Congreso Iberoamericano de Acústica. XXXI Congreso Nacional de Acústica – TecniAcústica 2000. II Jornadas Iberoamericanas de Ultrasonidos. II Congreso Ibérico de Acústica. EAA Symposium on Architectural Acoustics (Madrid, 16-20 Octubre 2000).
Part of this work has been supported by the National Spanish Research Program, contract no. AMB98-1029-C04-01.
Publicado también en número especial de la Revista de Acústica, Vol. XXXI, año 2000.
Peer reviewed
Rectangular enclosures, Transmission irregularity, Normal frequencies, Frequency distribution, Bolt's criterion, Sound response
Rectangular enclosures, Transmission irregularity, Normal frequencies, Frequency distribution, Bolt's criterion, Sound response
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