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Extraction of blade AE signature for in-service condition monitoring. D. J. Lekou , F. Mouzakis ( CRES ) N . Tsopelas, D. Papasalouros, A. Anastasopoulos ( Mistras Group ). Current SHM for blades. Damage Cracks, erosion, debonding , lightning, stains, etc. Rotor imbalance. - PowerPoint PPT Presentation
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EWEA 2013, Vienna, Austria, 4-7 February 2013
Extraction of blade AE signature for in-service condition monitoringD. J. Lekou, F. Mouzakis (CRES) N. Tsopelas, D. Papasalouros, A. Anastasopoulos (Mistras Group)
EWEA 2013, Vienna, Austria, 4-7 February 2013 2
Current SHM for blades
DamageCracks, erosion,
debonding, lightning, stains, etc.
Rotor imbalance
Inspection procedureVisual inspection (outside,
inside) Damage identification Damage location Off-line, periodic
Vibration Damage identification On-line, periodic
EWEA 2013, Vienna, Austria, 4-7 February 2013 3
Acoustic Emission methodDetection of transient elastic waves
High frequency (>20kHz)Due to rapid release of energy
During crack opening/propagationLocalized Source
Time
Sign
alThreshold
Amplitude
DurationRise Time
CountsCounts to peak
SourceAE wave
Load
Load
SensorAE system
EWEA 2013, Vienna, Austria, 4-7 February 2013 4
Acoustic Emission & blades
Successfully used in laboratory tests
Static & Fatigue On-line measurements
Under loadIdentification of damage
Location of damage
Overall linear location of AE sources
1 2 3 4 5 6 7 8 9 10 11
14 15 16 17 18
Failure area Small cracks
Bubbles
0
500
1000
1500
2000
2500
3000
3500
4000
0 2 4 6 8 10
0
5
10
15
20
25
30
35
40
0 2 4 6 8 10Blade radius (m)
Even
ts
EWEA 2013, Vienna, Austria, 4-7 February 2013 5
Demonstration on CRES NM750kW
Global WT measurements WT operational
Power, rotor speed, etc.Wind inflow
Acoustic EmissionMicro-II PAC8 channels
3 PAC-R6I-AST (60kHz) 5 PAC-R15I-AST (150kHz)
EWEA 2013, Vienna, Austria, 4-7 February 2013 6
General layout
VIRTUAL DESKTOP ON REMOTE LOCATION TERMINALS
1.22 m
0.5 m
0.75 m
0.75 m
1.0 m
PAC SAMOS MICRO II
WIRELESSROUTER
CH6
CH7
CH8
STRAIN GAUGE
CH5
CH4 CH2
CH3 CH1
MaxStrainPositio
nMin
StrainPositio
n
EWEA 2013, Vienna, Austria, 4-7 February 2013 7
Indicative resultsA
E A
mpl
itude
W
T P
ower
Time
Win
d S
peed
EWEA 2013, Vienna, Austria, 4-7 February 2013 8
40 45 50 55 60 65AE Amplitude
1
10
100
1000
10000
Dur
atio
n
Footprint of healthy operation
0 200 400 600 800WT Power (kW)
-200
0
200
400
600
800
1000
Max
/min
WT
Pow
er (k
W)
0 200 400 600 800WT Power (kW)
0
20
40
60
AE
Ene
rgy
0 200 400 600 800WT Power (kW)
-0.5
0
0.5
1
1.5
2
2.5
Max
Yaw
Pow
er (k
W)
EWEA 2013, Vienna, Austria, 4-7 February 2013 9
Conclusions & Future Work
AE for on-line monitoring appliedFootprint of healthy blade capturedFurther applications necessary to capture progressing failure
Tuning with classic inspections
Healthy operation, retrofitting
Healthy operation, Embedded
Known damage, retrofitting
Capture damage, Embedded
Indicative future steps
Application
EWEA 2013, Vienna, Austria, 4-7 February 2013 10
Thank you for your attention
Questions?
AcknowledgementFor this research funding has been received from the EC FP7 under GA no 239462 (NIMO)