Noise and vibration control in multiplex cinemas

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Daniella Grimaldi
6 anni fa
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1 Noise and vibration control in multiplex cinemas A. Farina ; P. Fausti Department of Industrial Engineering, University of Parma, Italy Department of Engineering, University of Ferrara, Italy

2 Topics Design and realization of a new multiplex cinema in Genoa Severe environamental conditions (industrial and trainway noise and vibrations, close to airport and docks) Strict specification in terms of acoustical and vibration control set by the customer

3 Overview Site for the construction of the multiplex cinema

4 Site for the construction of the multiplex cinema Overview

5 Plan multiplex cinema

6 Detailed Detailed Plan Plan CI PIOVE schermo di proiezione TERRAZZA HOLLYWOOD CAFE' CI PIOVE H=.00 H=.00 H=.0 H=.0 H=.0 H= H=.0 H=.0. H=.0 H= H=.0.. H=.0 H=.0 H=.0...

7 Significant Numbers floors: parking, commercial, cinema, technical cinema rooms, 80 m x seats, x seats, x seats, x seats = total seats Entrance and services 88 m Shops and restaurants: 00 m 8800 m parking area ( floors), 0 cars

8 Acoustical specifications (UCI) Apparent Sound Reduction Index (ISO-0/, ISO-) External walls Internal walls Fire-resistant walls Wall between cinema rooms Roof Floor Internal doors Wall of the projection room R w = db R w = 0 db R w = db R w = db R w = 0 db R w = 0 db R w = db R w = 0 db

9 Acoustical specif.. (Italian( Law) External walls Internal walls Fire-resistant walls Wall between cinema rooms Roof Floor Apparent Sound Reduction Index (ISO-0/, ISO-) Internal doors --- Wall of the projection room --- R w = db R w = 0 db R w = 0 db R w = 0 db R w = db R w = 0 db

10 Background noise UCI requires that the Maximum SPL with Slow time constant complies with NR-0 curve (L max,slow < NR0) this includes any source of noise, including passage of trains or aircrafts The Italian Law requires that the noise produced by steady-state equipment (HVAC) has an A-weighted equivalent level less than db(a) (L A,eq < dba) The UCI requirements are much more stringent than the Italian Law

11 Vibration limits UCI requires that continuous vibrations are less than the curve of BS- () UCI requires also that the vibrations are less than the maximum allowed for building of category in DIN-0- In practice, the Italian standard UNI- was applied, which specifies a maximum weighted acceleration level of db

12 Technical details

13 Technical details

14 Technical details

15 Technical details

16 Vibration control Neoprene rubber pads

17 Preliminary measurements Punto n. Punto n. Punto n.

18 Preliminary measurements (vibrations) Spettro di accelerazione massima - punto n. Spettro di accelerazione massima - punto n Accelerazione (m/s²) Accelerazione (m/s²) Frequenza (Hz) Frequenza (Hz) Valori massimi rilevati Soglia di percezione Valori massimi rilevati Soglia di percezione Spettro di accelerazione massima - punto n. Spettro accelerazione massima ponderata Limite di accettabilità secondo UNI - 0 mm/s² Accelerazione (m/s²) Accelerazione ponderata (m/s²) mm/s² Frequenza (Hz) Tot Frequenza (Hz) Valori massimi rilevati Soglia di percezione Valori massimi rilevati Soglia di percezione

19 Realization

20 Final verification measurements Isolamento fra sala ed - Dw = db (indice ISO a 00 Hz) - DL = db(a) Isolamento fra piano inferiore e sala - Dw = db (indice ISO a 00 Hz) - DL = db(a) D (db) D (db) Frequenza (Hz) Frequenza (Hz) Divisorio sala - sala Curva ISO- Divisorio piano inferiore - sala Curva ISO- Rumore di calpestio normalizzato - sala - Dnw= db - LAeq = 8.8 db(a) Verifica curve NR - rumore impianti sala Ln (db) 0 SPL (db) 0 0 NR-0 NR- 0 0 NR Frequenza (Hz) Frequenza (Hz) Rumore di calpestio Curva ISO- Rumore impianti in ottave Spettro limite NR0 Spettro limite NR Spettro limite NR0

21 Final verification measurements Profilo Esterno/Interno SPL (db-00hz) :: :: ::0 ::8 ::0 :0: :: :: :: Ora Esterno-treni Interno-treni Interno-fondo Spettro Isolamento Facciata sala - Dnm,nT,w = db Dm,nT (db) Frequenza (Hz) Isolamento facciata Curva ISO- Rumore treno in ottave Spettro limite NR0 Spettro limite NR Spettro limite NR0

22 Vibration measurements Point n. Point n.

23 Vibration measurements Point n. - 0 db Point n db

24 Vibration measurements Point n. - 0 db Point n db

25 Vibration measurements Weighted Acceleration Spectrum Law (db) TOT Frequency (Hz) Point (max values) Point (max values) Perception Limit

26 Conclusions Almost all noise and vibrations specifications were fulfilled The rubber support of horizontal structures was able to decouple vibrations above Hz The multilayer walls employing triple gypsum boards gave sound insulation much higher than expected Proper soundproofing was required for reducing the HVAC noise below the NR-0 curve

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