ZORBA

Validation of the model 

In this section, some comparisons of ZORBA's predictions and measurements are presented. The measurements have been performed in Sweden and in the Laboratory of Acoustics of Auckland University, in New Zealand.

The examples of validations of the model are here gathered by type of Facing:
Example 1-3: Perforated Facing.
Example 4-6: Slotted Panel.
Example 7-9: Slats.

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Example 1 - Perforated Facing
Porous Layer:
Width: 25 mm
Flow Resistivity: 7000 Rayl/m
Facing:
Width: 17 mm
Perforation Diameter: 8 mm
Perforation Pitch: 27 mm
Open Area: 6,9%

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Example 2 - Perforated Facing
Porous Layer:
Width: 50 mm
Flow Resistivity: 7000 Rayl/m
Facing:
Width: 17 mm
Perforation Diameter: 4,8 mm
Perforation Pitch: 13,5 mm
Open Area: 9,9%

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Example 3 - Perforated Facing
Porous Layer:
Width: 25 mm
Flow Resistivity: 7000 Rayl/m
Facing:
Width: 9 mm
Perforation Diameter: 7 mm
Perforation Pitch: 13,5 mm
Open Area: 21%

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Example 4 - Slotted Facing
Porous Layer:
Width: 25 mm
Flow Resistivity: 7000 Rayl/m
Facing:
Width: 17 mm
Slot width: 8 mm
Slot length: 250 mm
Slot vertical pitch: 65 mm
Slot horizontal pitch: 25 mm
Open Area: 11%

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Example 5 - Slotted Facing
Porous Layer:
Width: 50 mm
Flow Resistivity: 7000 Rayl/m
Facing:
Width: 17 mm
Slot width: 8 mm
Slot length: 250 mm
Slot vertical pitch: 65 mm
Slot horizontal pitch: 25 mm
Open Area: 11%

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Example 6 - Slotted Facing
Porous Layer:
Width: 50 mm
Flow Resistivity: 7000 Rayl/m
Facing:
Width: 17 mm
Slot width: 8 mm
Slot length: 108mm
Slot vertical pitch: 32,9 mm
Slot horizontal pitch: 35 mm
Open Area: 18%

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Example 7 - Slat Facing
Porous Layer:
Width: 30 mm
Flow Resistivity: 16768 Rayl/m
Facing:
Width: 13 mm
Slat width: 70 mm
Slot width: 1 mm
Open Area: 1,4%

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Example 8 - Slat Facing
Porous Layer:
Width: 30 mm
Flow Resistivity: 16768 Rayl/m
Facing:
Width: 13 mm
Slat width: 70 mm
Slot width: 4 mm
Open Area: 5,4%

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Example 9 - Slat Facing
Porous Layer:
Width: 30 mm
Flow Resistivity: 16768 Rayl/m
Facing:
Width: 13 mm
Slat width: 70 mm
Slot width: 49 mm
Open Area: 41%