smart lining - acoustic requirements on future lightweight structures … · smart lining -...

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


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


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


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.


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.


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

8


Noise Sources affecting Interior Noise

• Noise sources outside cabin

– Engines

• Fluid mechanic noise

– Boundary layer noise

– Antenna noise

– Landing gear, slats & flaps (departure + approach)

19.10.2012 9

• Noise sources inside cabin

– Air conditioning system

– Hydraulic system

– Avionic ventilation

– Vacuum toilets

– Air extraction system

– Electrics

– Passengers

turbulent

laminar


Cabin wall construction

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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


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


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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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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Solutions for improved cabin acoustics

19.10.2012 15

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


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)

19.10.2012 16


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


18

Vielen Dank

für

Ihre Aufmerksamkeit

smart lining - acoustic requirements on future lightweight structures … · smart lining -...

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