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SILENCE(R)

page 1Aero Days 2006 - Vienna Eugène Kors - Snecma

SILENCE(R)

SIGNIFICANTLY LOWER COMMUNITY EXPOSURE TO AIRCRAFT NOISE

by Eugène Kors

Co-ordinator of the SILENCE(R) programme

SILENCE(R)


Overview

� SILENCE(R) Scope and Objectives

� Evaluation methodology

� Selection of technologies

• Nacelle

• Engine

• Airframe

SILENCE(R)


Project Coordinator : Snecma Moteurs

No. Of Partners : 51

Objectives :

• Validation of Individual Technologies

• Identification of applicability over the product range

• Cost/ Benefit Analysis

Project Duration : 4 6 years (Start April 2001)

Total Budget : 112 MEuros (50% EC Support)

SILENCE(R) Technology Platform

SILENCE(R)


Progress in Noise Reduction

Entry into Service Date

Sid

elin

e T

ake-

off N

oise

Lev

elco

rrec

ted

for

airc

raft

thru

st

Comet 4

B707

1955 1960 1965 1970 1975 1980 1985 1990 1995 2000

2nd Generation Turbofans

Turbojets

1st Generation Turbofans

DC8

CV880

B720

CV990

Caravelle

B737

DC9

BAe1-11

VC10

Trident 1

B727

Caravelle 10

F28

L1011-500

VFW614

DC10-30

L1011-1DC10-10

B747-200

A300B747-100

B717-200

B737-600

A319-100

B767-300ER

F100

B777-200

MD90

F70

A321

A330

A340

B727-100QF

MD11

A320

B747-400

MD80

B767

A310

B757

BAe146B737-300

DC8-70

20 dB

SILENCE(R)


Years

- 3

- 9

- 6

0

Dec

ibel

s pe

r A

ircra

ft O

pera

tion

Mid-Term & Long-Term Industry ObjectivesConsistent with Vision 2020 /ACARE Goals

Mid-Term & Long-Term Industry ObjectivesConsistent with Vision 2020 /ACARE Goals

Advanced Concepts (Long-Term)Earliest Product Entry

into Service

Earliest Product Entryinto Service

Advanced Concepts (Mid-Term)

Research Initiative Noise Reduction Objectives

Generation 1

Solutions

Generation 2

Solutions

20061998 2002 2010

FP4 and FP5 Projects, including SILENCE(R) => <= FUTURE PROJECTS =>

Derivative products

Future products

Today

2016

SILENCE(R)


Current Aircraft Sensitivity to individual sources

Sideline

51%

2%3%19%

21%4%

Flyover Cutback

24%

1%

1%

32%

36%

6%

Approach

29%

17%

52%

0%0%2%

Jet Turb Comb Fan fwd Fan rwd Airframe

∆∆∆∆EPNLAIRCRAFT∆∆∆∆EPNLSOURCE

SILENCE(R)


How to reach Objectives

Active StatorsActive Wall-Mounted System

Integrated Fan Design

ANTLE & High Speed LP Turbines

UHBR Fan LP Compressor

Exhaust Splitters(radial / circum.)

NegativelyScarfed Intake

3D DistributedLiner

0 Splice Passive Liner

Intake LipLiner

Anti-Icing Adaptive Liner

AdaptiveLiner

Low Noise Core Nozzlew internal/external Plug

Low Noise Fan Nozzle

HF Treated Nozzle

Treated Plug

UHBR Gear Box

SILENCE(R)


HIGH LIFT DEVICES:HIGH LIFT DEVICES:

- Add-on Treatment- Low Noise Design

LANDING GEAR:LANDING GEAR:

- Add-on Treatment- Low Noise Design

Scope of Airframe Noise Reduction Technologies

How to reach Objectives

SILENCE(R)


IMPACT OF FURTHER NOISE REDUCTIONUSING AVAILABLE TECHNOLOGY (ICAO Study)

COSTSIMPACT

ONDOC( % )

0 1 2 3 4

NOISE REDUCTION ( EPNdB )

+5

+4

+3

+2

+1

0

APPROACH

SIDELINE

FLYOVER

Technology Evaluator - Cost / Benefit Evaluation

Reference Data - ANDES Study

SILENCE(R)


CFD analysis

Inlet plane

Three Stage Low-pressure TurbineTest case

� High Speed Compressor : Computational Fluid Dynamics simulations to identify potentials of noise reducti on in a High Speed LPC of an Aero Engine

SILENCE(R)


Low Noise Compressor for UHBR engines

� CFD based design

� Back –to- back testing on compressor rig

� Modal analysis techniques

� 1 BPF tone reduction by 8 dB

� No performance penaltiesBaselineconfiguration

Low noiseconfiguration

Inlet Guide VaneStator 1

New vanes

Baselineconfiguration

Low noiseconfiguration

Inlet Guide VaneStator 1

New vanes

SILENCE(R)


0-Splice liner

� Research supported by several prototypes tested in various facilities.

� Follow-on industry test demonstrated clear benefit

� Zero Splice technology is applied on A380/Trent 900

1BPF fieldshape at 80% N/RT (fan rig)

60

70

80

90

100

0 20 40 60 80 100

Angle (degrees)

SP

L (

dB)

10dB

Forward arc PWL at 1BPF (fan rig)

50 60 70 80 90 100

% N/RT

PW

L (d

B) 10dB

2 splices

ZSI

2 splices

ZSI


60

70

80

90

100

0 20 40 60 80 100

Angle (degrees)

SP

L (

dB)

10dB


60

70

80

90

100

0 20 40 60 80 100

Angle (degrees)

SP

L (

dB)

10dB


50 60 70 80 90 100

% N/RT

PW

L (d

B) 10dB


50 60 70 80 90 100

% N/RT

PW

L (d

B) 10dB

2 splices

ZSI

2 splices

ZSI

SILENCE(R)


ACTIVE

PASSIVE

cut-off frequency : 1700 Hz

HYBRID FUNCTIONING : active at low frequencies, passive at high frequencies

Distance plate-wiremesh

10 mm

17 mm

High attenuation levels over a large frequency range

Flow velocity : 10 m/s

Frequency (Hz)Frequency (Hz)

TL

(dB

)

hybrid passive/active absorber

Microphone

Wire mesh

Piezo-ceramicactuator

SILENCE(R)


Exhaust Nozzle Treatement

� CFD design

� Model tests for down-selection

� Flight test for full scale validation

SILENCE(R)


Exhaust Plug Designs

� Multiple Light-weight designs

� Down-selection process for best performance

� Manufacturing for full-scale validation

SILENCE(R)


Active Technologies applied to Fan Tone Reduction

Potential Fan Tone Reduction based on Small Scale model test

Hardware for

Large Scale

model test

Source: Snecma, EADS/CRC

8 dB BPF reduction achieved

SILENCE(R)


Development of Aeroacoustic test means

� Hot Stream Liner Test Facility

• Rig specifications:

- Mach 0.4

- Temperature 550 °C

- SPL 140 dB

- Insertion loss and in-situ acoustic impedance measurements in the frequency range between 0.5 and 5 kHz

• 23 Liner Configurations Tested

Perforate type of liner, broadband random noise exc itation,T = 500°°°°C, M = 0.325

-2.5

-1.25

0

1.25

2.5

0 1000 2000 3000 4000 5000

R1

R2

X1

X2

Cav

Impedance

SILENCE(R)


Development of Aeroacoustic test means

Aeroacoustic test in F1 (treated section)

Rotating modegenerator

SILENCE(R)


Scarfed inlet

SILENCE(R)


Fan Case

TCS InletAcoustically Lined

Barrel

Large scale tests on Fan rig

Forward Mode Detection Ring

SILENCE(R)


Full Scale Validation Tests

Static Tests trough 2003-2006

Test facilities used for Rolls Royce and Snecma eng ines

SILENCE(R)


Full Scale Validation Tests� Flight Tests trough 2003- 2005

SILENCE(R)


Full scale demonstration tests

� A340 flight test in 2003 including LG fairings & wi ng add-on treatments

Outer wheel caps(M-D)

Lower articulation link(AUK)

Dragstay Door legfiller (M-D)

Upper articulationlink (AUK)

Undertray

(AUK)

Upper side stay(AUK)

Gap filler (M-D)

MLG SET n°1

MLG SET n°2

PNLT (TPNdB)

30 60 90 120 150

PHI (°)

Low noise Baseline

1dB

1.8 EPNdB reduction on (LG) aerodynamic noise

0.4 EPNdB reduction on Approach Noise incl. Low Noi se solutions on High Lift devices (max. weight / max. flap)

SILENCE(R)


Advanced NLG Low Noise Design Features

Advanced Low Noise NLG:Original A340 NLG

� Deployable ramp type spoiler to protect upper leg area and bay doors

� Inverted steering mechanism(now located in the bay)

� Tow-bar rotated to the rear (located in low speed leg wake)

� Upstream installed torque link with fairing (to protect main leg)

� No lights on the gear, inner and outer hub caps,wheel/ tyre rim in-fills

SILENCE(R)


Advanced MLG Low Noise Design Features

Advanced Low Noise MLGOriginal A340 MLG

� Telescopic side-stay to replace- folding stay with

down lock mechanism- retraction actuator- hinged door

� Streamline leg door fairing

� Upstream installed torque link with fairing, no articulation link needed (0°bogie inclin.)

� Bogie front fairing, brake fairing , hub caps and wheel/ tyre rim in-fills

SILENCE(R)


Advanced NLG and MLG Noise Testing in DNW-LLF

Nose Landing Gear Main Landing Gear

102

103

-10

-8

-6

-4

-2

0

2

4

6

8

10Noise reduction relative to Baseline A340 GEAR

Frequency (Hz)

∆ dB

predictedmeasured

102

103-10

-8

-6

-4

-2

0

2

4

6

8

10Noise reduction relative to Baseline A340 GEAR

Frequency (Hz)

∆ dB

predictedmeasured

NLG MLG

Noi

se r

educ

tion

in

∆∆ ∆∆dB

Noi

se r

educ

tion

in

∆∆ ∆∆dB

Frequency [Hz] Frequency [Hz]

MeasurementPrediction

MeasurementPrediction

SILENCE(R)


Thank Youfor

Your Attention

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