Hall
Acoustics
Prediction
of the acoustic quality of rooms
and halls of any size and purpose
Ó
Tisseyre
& Associés
IDDN FR 001 420 005 00 SP 1999 000
30500
Presentation
- Listening
room module -
Calculation : Acoustic illumination - Temporal
sound decay - Attenuation of sound in space
- Intelligibility - Directivity
Acoustics predicting software developed in the Windows environment by TISSEYRE & Associés is the basis for computer models supporting the architectural acoustics design of operations carried out by TISSEYRE & Associés; which garantees results obtained through its modeling.
The Hall Acoustics software simulates the acoustic behaviour of a hall with the help of the finite element technique, so allowing a constraints analysis. It is based on diffuse reflexion on the elements and directive reflexion on the walls hypothesis.
Adapted to volumes of any shape, it makes it possible to display and evaluate the acoustic quality, and therefore optimize, the design of the hall under study.
Two main room families may be studied :
Listenning halls : theatres, conference halls, concert halls, etc…
Musical activity rooms : concert halls, operas, recording studios, etc...
The meshing technique makes it possible to adjust the calculation precision to the constrainsts and objectives.
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I - Geometric modeling
- Creating the hall volume, possibly using Autocad.
- Displaying the volume ; various views, zoom, checking the constitution of the surfaces (automatic verification algorithm).
- Meshing the surfaces: the user chooses the meshing fineness as a function of the specific acoustic constraints on each surface and on the furniture.
- Setting the acoustic absorption coefficients on each surface.
- Positionning musicians or speakers.
- Choice of musical instruments: various directivity patterns.
II - Calculation
- Sound pressure levels, T60, echogram.
- Attenuation of sound with distance and Gmid.
- Relative acoustic illumination on the surfaces of the model.
- The room’s acoustic indices: definition, clarity, lateral fraction.
- Directivities, i.e. directions from which, at a given reception point, the acoustic intensity emanates:
- static directivity (constant sound source)
- dynamic directivity (impulse sound source), time repartition of the received energies: instantaneous or cumulated.
The Shanghaï Opera model
Main models achieved to this day :
Operas : Acropolis Nice, Opera of Shanghaï, Opera of Chongqing, Opera of Beijing, Opera of Canton..
Congress halls : Porte Maillot Paris, Kiev Ukraine, Berlaymont 2000 Belgium, Al Shura Riyadh.
Auditoriums : Beijing Concert Hall, Saint-Jean Corbeil, Alençon, Bayonne, Toulouse, Bayeux, Monte-Carlo.
Theatres : Neuilly, Périgueux, Narbonne, Nîmes, Vincennes, Toulouse, Dinan, Les Célestins in Lyon
Large volumes: Grand Palais Paris, Official Reception Building Riyadh.
Calculation
of the temporal sound decay
Calculation
of the intelligibility
