optimization of the acoustic characteristics of diffusive surfaces - analysis result
TRANSCRIPT
Jessica Menichelli
POLITECNICO DI TORINO
Corso di Laurea Magistralein 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)
Jessica Menichelli
3D DIFFUSER and ACOUSTIC RESULTS
Jessica Menichelli
0.24250.1295
B
A
C D
EA (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
Jessica Menichelli
0.2550 0.2965
0.3600
0.2488
0.2982
0.2945
1.2000
1.2000
0.29
65
0.36
000.24
88
0.22
98
Diffuser: CONFIGURATION_1_MIXED - Geometry
Jessica Menichelli
0.22
98
Diffuser: CONFIGURATION_1_MIXED - Geometry
Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Qualitative analysis_Ray tracing
Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Qualitative analysis_Ray tracing
Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Quantitative analysis_Intensity response
125
Hz
1000
Hz
8000
Hz
70 dB
35 dB
0 dB
70 dB
35 dB
0 dB
70 dB
35 dB
0 dB
Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Measurements of acoustic performance
Scattering and absorption coefficients
Frequency [ Hz ]
Coeffi
cien
t [ -
]
absorptionscattering
ideal scattering
Jessica Menichelli
Diffuser: CONFIGURATION_1_MIXED - Prototype realization
Jessica Menichelli
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