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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