Post on 11-Apr-2018
A Joint Diehl Thales Company
Smart Lining - acoustic requirements on
future lightweight structures
Dr. Dietmar Völkle
Head of Innovation
www.diehl-aircabin.de
Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company 2
Diehl Aircabin - One of Four Operational Units
Sales: over € 700 m Employees: over 3,500 Headquarters: Laupheim, Germany
Trend 2012
joint venture with joint venture with
Sales: ≈ 230 m €
Employees: ≈ 1,200
Shareholders: 51% Diehl,
49% Thales
Sales: ≈ 330 m €
Employees: ≈ 1,400
Shareholders: 51% Diehl,
49% Thales
Sales: ≈ 140 m €
Employees: ≈ 490
Sales: ≈ 30 m €
Employees: ≈ 200
Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company 3
Diehl Aerosystems - Building Blocks
From cockpit to cabin. Fully integrated or individual packages.
Aircraft Systems Cabin Interiors
Cockpit
Systems
Flight & Engine
Control Systems
Avionic
Platforms
Air Distribution
Systems
Crew Rest
Compartments
Floor-to-Floor/
Lining
VIP
Furniture
Service
Modules
Comfort
Modules
Utility
Systems
Safety & Supply
Systems
Interior Lighting
Systems
Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company 4
Product Overview
Air Distribution Systems
Diehl Aircabin is the reference for advanced ducting: Less weight. Fewer parts. Less maintenance. Better accoustic.
Air Ducting and Air Outlets Drain Pipes in Composite
Technology
Highly integrated and complex
Air Ventilation Systems
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Product Overview
Compartments & Monuments
Cabin Crew Rest Compartment
(BCRC / LDCRC / UDCRC / OHCRC) and
Flight Crew Rest Compartments
Delivered in an approved quality and maturity, the compartments and monuments are optimized for quick and efficient installation. Completely tested, plug & play solutions.
Integrated Systems (O2,
Electrics, IFE, Air Ducts, Fire
Ext. System)
Highly customized Monuments
e.g. relax areas, smoking
areas, kindergarden, wine
carry areas.
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Lining & Floor-to-Floor Capabilities
Product Overview
• Dado Panels
• Sidewalls
• Light Covers
• Bins
• Ceilings • Door & Doorframe Lining
• Entrance Area
Delivered as preassembled modules with electric, lighting, O2 and safety equipment integrated.
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Product Overview
Individual Cabins / Mock-Ups
VIP & Corporate Jet Linings
* Designed by Mahler Industrial Design
Special Furniture / Real Wood
Veneer
Mock-Ups
High-end surfaces based on extremely light weight composite materials. Integrated light solutions.
Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
Acoustic Comfort
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Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
Noise Sources affecting Interior Noise
• Noise sources outside cabin
– Engines
• Fluid mechanic noise
– Boundary layer noise
– Antenna noise
– Landing gear, slats & flaps (departure + approach)
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• Noise sources inside cabin
– Air conditioning system
– Hydraulic system
– Avionic ventilation
– Vacuum toilets
– Air extraction system
– Electrics
– Passengers
turbulent
laminar
Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
Cabin wall construction
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Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
Noise transmission paths
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Lining element
Fuselage structure
Fixing element
Glass wool
insulation
Source: Prof. Wolfgang Gleine
Air borne noise Leakage Noise Structure borne noise
Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
Example for Cabin Noise Distribution
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0 20 40 60 80 100
Cabin length [%]
LA
[dB] 5 dB
A330 Cruise Conditions
Source: Airbus Operations
Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
General Requirements on Interior Noise
• Creation of a comfortable acoustic environment inside Cabin and Cockpit
• Silent but acoustic privacy Cabin
• As silent as possible Crew Rest Compartments
• Well balanced noise in cabin Whole Cabin, Cockpit
• No tonal components Whole Cabin, Cockpit
• Good speech intelligibility Whole Cabin, Cockpit
• Compliance to noise regulations e.g. Galley area
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Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
Solutions for improved cabin acoustics
Mass enhancement:
• Additional silicone heavy layer is added in order to increase the
transmission loss
• Extensive weight and cost impact
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Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
Solutions for improved cabin acoustics
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Noise masking
• Annoying noise from flight deck
and galley within crew rest
compartment
• Overlay of “ambient noise” in low
frequency range
• 5 kg weight investment into
intelligent noise masking system
lead to savings of weight for
standard insulation material
• Easy adaption of “masking sound”
via software update
Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
Conclusion
• All presented solutions show negative effects
– Weight
– Surface quality
– …
• New approach for enhanced cabin acoustics needed
• Cooperation with the German Aerospace Centre (DLR):
Smart active Lining Module (SALIM)
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Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
Acoustic comfort with smart active lining modules
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• Active control of noise
emitting structural
vibrations of the sidewall
panel (ASAC)
• Best performance in the
low-frequency range
(< 500 Hz)
• Reduction of narrow- and
broadband noises
• Effective for all noise
sources entering from the
exterior of the sidewall
panels
• Suitable for retrofitting
Copyright Diehl Aircabin GmbHA Joint Diehl Thales Company
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Vielen Dank
für
Ihre Aufmerksamkeit