Optimization of the acoustic characteristics of diffusive surfaces : an objective evaluation method at the preliminary design phase

INDEX

1.Introduction

2.Sound propagation and architecture

2.1.Physical phenomenon: absorption

2.1.1.Sound absorbing panels

2.1.2.Absorption coefficient

2.1.3.Measurement methods

2.2.Physical phenomenon: reflection

2.3.Physical phenomenon: diffusion and scattering

2.3.1.Diffusion coefficient

2.3.2.Scattering coefficient

2.3.3.Snell's law and Lambert's law

2.3.4.Measurement methods

2.3.5.Diffusion vs Scattering

3.State of art of acoustic

3.1.Leading existing diffusing panels

3.1.1.Schroeder's diffusers

3.1.2.Maximum length sequence diffusers (MLS)

3.1.3.Quadratic Residue Diffusers (QRD)

3.1.4.Primitive Root Diffusers (PRD)

3.1.5.Fractal diffusers

3.1.6.RPG Skyline®

3.1.7.Polycilindrical deflector

3.2.Other diffusers

4.Towards scattering database and geometrical guidelines

4.1.Macroscale geometries

4.2.Geometric dimensions of specimens

4.3.Specimens shape

4.4.Guidelines for scattering maximization

5.A case study of diffusers optimization

5.1.Acoustic criteria and design

5.2.Simulation: qualitative analysis

5.3.Simulation: quantitative analysis

5.4.Prototype realization

5.5.Measurements

5.6.Repetition and modularity of the diffusers

5.7.Possible applications

6.Conclusions

7.Appendix A

8.Appendix B

9.Bibliography

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