This document appears to be a thesis written by Jessica Menichelli about optimizing the acoustic characteristics of diffusive surfaces in the preliminary design phase. It includes sections about 3D diffuser geometry and acoustic results, qualitative ray tracing analysis, quantitative intensity response analysis, measurements of scattering and absorption coefficients, and a prototype realization. The document presents the design process and evaluation of different configurations to optimize the acoustic performance of diffusive surfaces early in the design phase.

1. Jessica Menichelli
POLITECNICO DI TORINO
Corso di Laurea Magistrale
in Architettura Costruzione Città
Master Thesis
Optimization of the acoustic characteristics of
diffusive surfaces: an objective evaluation method
at the preliminary design phase
Ottimizzazione delle caratteristiche acustiche di superfici
fonodiffondenti: un metodo per la valutazione oggettiva nella fase
progettuale preliminare
Jessica Menichelli
Politecnico di Torino - Dipartimento di Energia - Laboratorio di Acustica Applicata (LAA)

2. Jessica Menichelli
3D DIFFUSER and ACOUSTIC RESULTS

3. Jessica Menichelli
0.2425
0.1295
B
A
C
D
E
A (0.00 ; 0.77)
B (0.16 ; 0.65)
C (0.80 ; 0.98)
D (0.55 ; 0.01)
E (1.07 ; 0.58)
The principal geometry is analysed in relation to the depths of
each prism. The points releted to the depths are interpolated
creating a curve surface. Last step of the process,
the subtraction between the prismatic survace and the curved
one. A new surfaces,“mixed”, is created.
57 %
0.248 m
0.025 m0.03 m0.025 m
0.30 m
0.24 m 0.13 m
0.10 m 0.025 m
0.03 m

4. Jessica Menichelli
0.2550 0.2965
0.3600
0.2488
0.2982
0.2945
1.2000
1.2000
0.3600
0.2488
0.2298
Diffuser: CONFIGURATION_1_MIXED - Geometry

5. Jessica Menichelli
0.2298
Diffuser: CONFIGURATION_1_MIXED - Geometry

6. Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Qualitative analysis_Ray tracing

7. Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Qualitative analysis_Ray tracing

8. Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Quantitative analysis_Intensity response
125Hz1000Hz8000Hz
70 dB
35 dB
0 dB
70 dB
35 dB
0 dB
70 dB
35 dB
0 dB

9. Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Measurements of acoustic performance
Scattering and absorption coefficients
Frequency [ Hz ]
Coefficient[-]
absorption
scattering
ideal scattering

10. Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Prototype realization

11. Jessica Menichelli
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