ACUSTIC SOLUTION

Site Survey

Survey the scene or provide the basic building drawings, photos and videos of the scene.

Project Case

Design the Project Base on Function, Visual Aesthetics Requipment

 Process Overview

ODEON -Acoustics simulation Process

Acoustic Design of Lecture Classroom in Shishan Experimental School

The auditorium area is 707.5m2, the highest floor height is 11.09m, the lowest floor height is 6.85m, the width is 25.5m, and the length is 30.67m; the stage area is 406.4m2, the floor height is 10.29m, the main stage width is 17.8m, and the depth is 12.8m

726 seats, all pool seats, full steps, a total of 26 rows, front and rear elevation difference (total rise) is 4.243m, average rise is 0.17m

Multifunctional hall with sound reinforcement system as the main sound source

  1. GB/T 50356-2005 《 Technical specifications for architectural acoustics of theaters, cinemas and multi-purpose halls” 》
  2. JGJ57-2016 《 Theater architectural design code 》
  3. GB/T 50076-2013 《 Indoor reverberation time measurement specification 》
  4. GB/T 15508-1995 《 Speech intelligibility test method 》
  5. GB/T 50121-2005 《 Building sound insulation evaluation standard 》
  6. 《Concert Hall and Opera House 》(by Barrenac)
  7. Odeon 14.03 Building sound simulation software

Project Case

Design for Decoration,function& Sound and Light

According to JGJ57-2016 《Theatre Architectural Design Code》, the height of the platform should meet the requirements of the following table

Type of drama  

Seat capacity Proscenium mMain stage (m)
widthheightwidthdepthclear height

Opera

 <8008~105~615~189~1213~15
801~120010~126~718~2412~18

15~18

Drama

<80010~126~718~2112~1515~18
801~120012~147~821~2715~21

18~24

Musical

1200~150012~167~1024~3015~2118~24
>150016~1810~1230~3321~27

24~30

A group of 6 linear array speakers are about 2000mm in length. Therefore, they need at least 2200 height space for hidden installation in the sound bridge. The height from the top to the bottom of the original ceiling beam will be less than 1m, which is not enough to set the ceiling shape reasonably.

According to JGJ57-2016 《Theatre Architectural Design Code》, the position of the surface light bridge should be such that the angle between the center point of the light exit of the lamp and the vertical line of the platform line and the platform is 45°~50°. Class A theaters should have at least two surface light bridges, and Class B theaters should have at least one surface light bridge. For small theaters with less than 800 seats, just install a light bridge.

The clear height of the horse track should not be less than 1.8m, but it will result in the ceiling height of only 1.34m. Under this height, the shape of the stacked ceiling cannot be arranged reasonably. In order to ensure the acoustic effect, part of the horse track space must be sacrificed.

The reflected sound evenly covers the seating area

Ceiling reflected sound plays an important role in creating a sense of space and enhancing sound intensity. It should be ensured that the reflected sound rays can evenly cover the seating area

The reflected sound should be beneficial early reflection

Haas effect: When the time difference between the reflected sound and the direct sound is within 35ms, people cannot distinguish between the two sound sources and cannot feel the lagging sound; when the time difference is 35ms~50ms, the lagging sound in the direction of the direct sound can be felt; when the time difference is greater than 50ms, can clearly distinguish the lagging reflected sound and its direction, that is, the obvious echo. The reflected sound delay should be within 35ms and should not exceed 50ms.

Project Case

3D Modeling of Hall

The computer simulation of the sound field is to establish a mathematical model of the actual hall, and then simulate the propagation law of sound waves in the hall according to the geometric acoustic law. ODEON 14.03 has the functions of both the sound image method and the sound ray method, and can adopt the Lambert scattering algorithm to make the simulation process more realistic, and the calculated results are closer to the measured values.

The origin of the coordinates is the intersection of the central axis of the platform and the front of the stage ground (elevation is ±0.000), and the direction from the origin to the auditorium is the positive direction of the Y axis; the side wall pointing from the origin to the side of the auditorium is the positive direction of the X axis ; From the origin to the top of the stage is the positive direction of the Z axis.

Layout according to the table shown in the previous section

Without affecting the calculation results, this three-dimensional model appropriately simplifies the size of the auditorium: the auditorium is 0.8m above the ground, and the scattering coefficient is 0.6; doors, windows and walls are treated on the same plane; the curved surface is divided into small planes. This model contains 696 faces.

Project Case

Simulation of Data Analysis

Rear Voice Simulation (Original Design)

Rear Voice Simulation (SNA Acoustic Design)

Receiving point

Speech intelligibility D50
125Hz250Hz500Hz1000Hz2000Hz4000Hz
Audience hall10.730.730.690.720.730.75
20.750.80.820.850.840.85
30.820.850.860.880.870.88
40.670.680.650.660.670.69
50.730.760.740.760.750.75
60.720.760.790.820.820.82
110.710.760.750.790.790.8
120.820.850.860.880.880.88
130.740.790.80.840.840.84
140.570.610.590.620.630.67
150.680.740.760.790.780.79
160.680.70.640.640.640.65
Average value0.720.750.740.770.77

0.78

Receiving point

Binaural Correlation IACC
125Hz250Hz500Hz1000Hz2000Hz4000Hz
Audience hall10.1540.2520.3280.3550.3950.422
20.1750.3200.2800.2010.3180.187
30.1120.2840.4420.4630.2710.297
40.3970.1110.2790.2170.2030.139
50.0930.2120.2610.2740.1610.154
60.0810.1690.3110.4080.3110.253
110.3710.3010.2800.1860.3930.348
120.0510.3610.3860.5430.3660.303
130.1020.1250.3600.2940.2850.317
140.1900.0780.2830.2330.2730.305
150.1530.1980.3320.2670.2810.304
160.2330.1120.2250.1590.1500.164
average value0.1760.2100.3140.3000.2840.266

Project Case

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