Een presentatie van Foteini Setaki. Zij is afgestudeerd aan de TU Delft, faculteit Building Technology & Architectural Engineering. Het onderwerp van deze lezing was het onderzoek naar en het ontwerpen van een nieuw type akoestisch paneel. Dit paneel bevat kleine luchtkanalen (in de vorm van buisjes) die het geluid opvangen en dempen. Het paneel kan voor elke situatie volledig op maat gemaakt worden, zodat het op exact de juiste locatie gemonteerd kan worden waar het effect van het paneel optimaal is. Gegeven op dag 7 van Soundbites by Merford met als thema: Slimme Materialen. http://www.merford.nl/soundbites

1. TU Delft
Acoustics by
Additive Manufacturing
Foteini Setaki
foteini.setaki@gmail.com
2012
Technische Universiteit Delft
Challenge the future

2. Framework
DESIGN
PROCESS
ACOUSTIC ACOUSTIC MATERIAL
PANEL PERFORMANCE
COMPUTATION
FABRICATION
ADDITIVE
MANUFACTURING
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3. AM in
Acoustics
Loughborough University ETH Zurich CITA Copenhagen
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4. Acoustics
Auditorium Office School Class
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5. D = 2.50cm
Additive
Manufacturing
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6. Common
Process
01 CAD 02 STL 03 FILE TRANSFER 04 MACHINE SETUP
FILE
TRANSFER
3D SET
CAD SAVE AS: PRINTER
.STL UP
05 BUILD 06 REMOVE 07 POST-PROCESS 08 APPLICATION
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7. PDI-Absorber
LOCAL GEOMETRY
Concept: Passive
Destructive Interference
SCENARIO 2:
HELMHOLTZ ABSORBER Passive destructive interference
f = c/ 2(l2 - l1)
[c] speed of sound in air
[l1] length of the short
air path
[l2] length of the longer
air path
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SCENARIO 4:

8. Principles
f = (2n-1) c / 2 (L2 - L1)
[f]
frequency
[c]
Point of Interference: speed of
180o out of phase sound in air
[n]
random integer
[L1]
length of the
short air path
[L2]
length of the
long air path
Short Path: Long Path:
L1 L2 = L1 + ΔL
Incident Sound Wave
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9. Phase 1
03
06 04
05 02
01
07
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10. Measurements
Impedance Tube
[sample diameter: 3cm]
Fabrication:
ZCORP Z310
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11. Samples
Diameter
n 0.1
Ltot = 10.28cm
D = 1.00 cm
Geometry Length
n 0.2 n 0.4 n 0.6
Ltot = 10.28cm Ltot = 36.7cm Ltot =19.55cm
D = 0.75 cm D = 0.5 cm D = 0.5 cm
n 0.3 n 0.5 n 0.7
Ltot = 10.28cm Ltot =19.55cm Ltot = 36.7cm
D = 0.5 cm D = 0.5 cm D = 0.5 cm
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12. Phase 2
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13. Measurements
Impedance Tube
[sample diameter: 3/ 10cm]
Fabrication:
EOSINT P 730
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14. High
Frequencies
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15. SMALL SAMPLES
Small
D = 3.00cm Samples
H =3.00/ 9.00/ 10.00cm
n1.1 n1.2 n1.3
Ltot = 10.28cm Ltot = 10.28cm Ltot = 10.28cm
D = 1.00cm D = 0.75 cm D = 0.5 cm
n2.1 n2.2 n2.4 n2.5 n2.3
Ltot = 34.30cm Ltot = 34.30cm Ltot = 17.15cm Ltot = 17.15cm SOLID
D = 1.00cm D = 0.75cm D = 1.00cm D = 0.75cm
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16. Low-Mid
Frequencies
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17. Big
Samples
D =10.00cm
H =10.00cm
BIG SAMPLES: DIAMETER
MEASUREMENT’S ACCURACY
n3.1.A 3.1.B n3.2.A 3.2.B n3.3.A 3.3.B
Ltot = 52.13cm Ltot = 52.13cm Ltot = 52.13cm
D = 1.00cm D = 2.00cm D = 3.00cm
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18. Big
Samples
D =10.00cm D =10.00cm
H =10.00cm H =10.00cm
6.00cm
---
BIG SAMPLES: LENGTH BIG SAMPLES: THICKNESS / [NO]CAP/ GEOMETRY
n3.4 n3.5 n3.6 n3.7 n3.8
Ltot = 34.30cm Ltot = 108.30cm Ltot = 29.21cm Ltot = 29.21cm Ltot = 29.21cm
D = 2.00cm D = 2.00cm D = 2.50cm D = 2.50cm D = 2.50cm
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19. Big
Samples
BIG SAMPLES: COMBINATIONS/ DIAMETER SCALING
n4.1 n4.2 n4.3 n4.4
2*L1 + L2 L1 + L2 + L3 5*D 5*L
L1 = 34.3cm L1 = 34.3cm/ L2 = 68.6cm Ltot = 19.28cm Ltot = 52.13cm
L2 = 68.6cm L3 = 51.5cm D = 2.00cm D = 2.00 - 1.00cm
D = 1.50cm D = 1.50cm
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20. Summary
Relation between
Geometry & Performance
01 Coherence with Theory
02 Interference Point
03 Length
04 Diameter
05 Material Thickness
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21. Summary
Relation between
Geometry & Performance
06 Accuracy
07 Grading Cross-Section
08 Multiple Channels
09 Exposed Geometry
10 Position of the holes
11 Distance between
adjacent air-paths
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22. Design
Guidelines
Design Guidelines
01 Length
1
/4 Ltot < ΔL < Ltot
02 Diameter
0.75 cm < D < 2.5 cm
03 Predicting Peak Frequencies
1
/4 Ltot < ΔL < Ltot
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23. Future
Suggestions for the Future
01 Material Resolution
02 Distance between air-paths
03 Geometry of air-path
04 Average values
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24. Phase 3
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25. Applications
CERTAIN TYPES SMALL RE
INTERIORS GION COMPLEX GEOM-
OF BROADBAND ETRY
SIGNAL/
LOW/ MEDIUM
FREQUENCIES
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26. Design
Proposal
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27. Design
Proposal
Core
Units
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28. Design
(x,y) Steps
Architectural Constraints
Acoustic Demands
D W R = λ/8
Architectural Constraints Targeted Frequency Targeted Frequency
Acoustic Demands W R
Fabrication Constraints
(x,y)
D
(x,y)
01_Define Points 02_Define “absorbing space” - 03_Define distance between
Iso-Curves air-paths
01_Define Points 02_Absorbing Space 03_Distance between
Air-paths
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29. Design
Steps
r d
Distance 01_Define Points
Diameter: 02_Define “absorbing space” - 03_Define distance between
1-4cm 0.75cm < r < 2.5 cm
Iso-Curves air-paths
r
d
04_Define position of sound 05_Draw Air-paths 06_Final outcome
entrance of air-paths
04_Entrances 05_Air-Paths 06_Final Outcome
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30. Distribution
400 Hz
500 Hz
750 Hz
1000 Hz
1500 Hz
500 Hz 1000 Hz
400 Hz
1500 Hz
750 Hz
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31. Unit
End Parts End Parts
This part of This part of
the tube is the tube is
constant constant
Middle Middle
Point Point
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32. Fabrication
1 Concepts
2
3
4
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33. Perspective
View
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34. Perspective
View
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35. Visits
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36. Collaborations
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