Acustica arquitectonica 2008
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Transcript of Acustica arquitectonica 2008
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Acústica Arquitectónica
Universidad Nacional de Lanús
Prof: Jorge PetrosinoAuxiliar docente: Ianina Canalis
Bibliografía:Carrión Isbert – Diseño acústico de recintos
Ballou – Handbook for Sound EngineersAlton Everest – Master Handbook of Acoustics
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REVERBERANCIA
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Zona A: La reflexión llega antes de los 50 ms: el oído integra la reflexión y se produce un aumento deinteligibilidad y de sonoridad.Zona B: La reflexión llega antes de los 50 ms, si bien con un nivel relativo más elevado: el oído integrala reflexión, pero se produce un desplazamiento de la localización de la fuente sonora, generadoradel sonido directo, hacia la superficie generadora de la reflexión (“image shift”).Zona C: La reflexión llega después de los 50 ms: la reflexión no es perjudicial para la inteligibilidaddebido a que su nivel relativo es suficientemente bajo.Zona D; La reflexión llega después de los 50 ms, si bien con un nivel relativo más elevado: la reflexiónes percibida como un eco y se produce una pérdida de inteligibilidad.
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FILTRO PEINE (COMB-FILTER EFFECT)
Efecto de cancelación de ondas por retardos provocados por reflexión.
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FILTRO PEINE (COMB-FILTER)
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ONDAS ESTACIONARIAS ENTRE DOS PAREDES
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MODOS PROPIOS DE UNA SALA
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DISTRIBUCIÓN DE MODOSFrecuencias propias de una sala rectangular (a) y de una sala cúbica (b)
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CRITERIO DE BOLT SOBRE DISTRIBUCIÓN DE MODOS
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REGIONES DE FRECUENCIA
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REGIONES DE FRECUENCIA
Región X: por debajo de la frecuencia mínima audible (subsónico)
Región A: desde el mínimo audible (o desde el modo más grave) hasta fmáx
Región B: desde fmáx, hasta 4 veces fmáx.
Región C: por encima de 4fmáx.
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CRITERIO DE BONELLO
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VALORES SUGERIDOS DE NC SEGÚN EL TIPO DE USO
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AISLACIÓN PARED SIMPLE
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ESPECIFICACIÓN DE AISLACIÓN: RW (Argentina/Europa) o STC (EEUU)
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CAMPO DIRECTO – CAMPO REVERBERANTE – DISTANCIA CRÍTICA
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ABSORCIÓN – ABSORTANCIA - RT60
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MATERIALES ABSORBENTES
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TIEMPO DE REVERBERACIÓN – RT60 (FÓRMULAS DE SABINE Y EYRING)
SABINE NORRIS - EYRING
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EFECTOS DEL ESPESOR Y DE LA DISTANCIA A LA PARED
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MATERIALES ABSORBENTES SUSPENDIDOS DEL TECHO
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ELEMENTOS ABSORBENTES SELECTIVOS (RESONADORES)
- De membrana o diafragmático- Simple de cavidad (Helmholtz)- Múltiple de cavidad por paneles perforados o ranurados- Múltiple de cavidad por listones
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RESONADOR SIMPLE DE CAVIDAD (HELMHOLTZ)
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RESONADOR MÚLTIPLE DE PANELES PERFORADOS (HELMHOLTZ)
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TIEMPO DE REVERBERACIÓN - RT60
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CALIDEZ ACÚSTICA (BASS RATIO : BR)
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BRILLO (Br)
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EARLY DECAY TIME (EDT)
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SONORIDAD (G)
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INTIMIDAD ACÚSTICA - “INITIAL-TIME-DELAY GAP”
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RELACIONES ENERGÉTICAS – ELR Early to Late Ratios (Ct, Ct0)
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PARÁMETROS ACÚSTICOS
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DIFUSIÓN DEL SONIDO (DIFUSORES)
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DIFUSORES POLICILÍNDRICOS
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DIFUSORES DE SCHROEDER – 1. DIFUSOR MLS (Maximum Length Sequence)
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DIFUSORES DE SCHROEDER – 2. DIFUSORES DE RESIDUO CUADRÁTICO (QRD)
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