Science @ MCC” - IATA€¦ · “Science @ MCC” Dr. Stefano Laureti1 Mr. Michael Stamm2, Mr....

“Science @ MCC”

Dr. Stefano Laureti1

Mr. Michael Stamm2, Mr. Tommaso Seresini3, Dr. Helge Pfeiffer3, Prof. Pietro Burrascano4, Prof. Marco Ricci1

1 DIMES, University of Calabria, Rende (CS) Italy2Brussels Airlines, Belgium

3KU Leuven, Belgium4 Department of Engineering, University of Perugia, Italy

15th Maintenance Cost ConferenceAthens, Greece

18-19 September 2019

Dr. Stefano Laureti et al. -15th Maintenance Cost Conference - Athens, Greece - 18-19 September 2019

➢ “The NDTonAIR” project➢ Investigated applications

• Ultrasonic Inspection

Wing Gear Rib 6 Crack in the A33F• Active Thermography

Water ingress

RR Air Intake Noise Panel

Loose rivets➢ Future works and Conclusions

Presentation Outline

The NDTonAIR ProjectBeneficiaries (Recruiting & Training):

Univ. Perugia (IT) – Coord. Prof P. Burrascano

Brussels Airlines (BE) – Mr J. Reynaert

CEA-List (FR) – Dr D. Premel, Dr C. Rebaud

Fraunhofer IKTS (DE) – Dr B. Koehler

Kaunas KTU (LT)- Profs R.Kazis, L. Mazeika, E. Jasiuniene

KU Leuven (BE) – Profs M.Wevers , C. Gloriuex, H. Pfeiffer

Univ. de Nantes (FR) – Prof G. Berthiau

Univ. of Newcastle (UK) – Prof G.Y. Tian

RECENDT (AT) – Dr P. Burgholzer

TWI Limited (UK) – Dr S. Soua

Univ. of Warwick (UK) – Profs D.Hutchins ,S. Dixon

Partners (Secondment & Training):

Univ. Calabria (IT) – Chair of the supervisory board Prof M. Ricci

Manager Dr S. Laureti

Univ. Cassino (IT)

COTESA (GE)

Dresden TU (GE)

FH Upper Austria (AT)

JKU Linz (AT)

MDP (IT)

Univ. Paris Saclay (FR)

SIEMENS (GE)

X-Phase(IT)

The NDTonAIR Project

3.8 M€

4 years

???!?!

15 PhD/ESR’s

• Development of new NDT & SHM methods• Promotion of (non-)scientific collaboration• Training of aviation NDT experts

Foster academic & industrial

collaboration

www.ndtonair.eu

Investigated applications

Wing Gear Rib 6 Crack in the A33F

• Active Thermography

Water ingress

Loose rivets

➢ Standard maintenance procedure: REMOVAL OF LANDING GEAR

Assumptions:

○ Crack propagation from the inside;○ Initial starting point of crack between FWD and AFT Bush (see picture below);○ Small cracks only detected with Eddy Current after removal of Landing Gear;○ Visual inspection only enough when crack propagated through the whole structure;

Wing Gear Rib 6 Crack in the A33F - AIRBUS

• Inspection of moved bushes• If grease and/or bushes are moving, then:

• Landing Gear (LG) removal;• Dye penetrant inspection;

• Inspection of moved bushes• If grease and/or bushes moved:

• landing gear removal• PAUT inspection

Wing Gear Rib 6 Crack in the A33F - AIRBUSStandard maintenance procedure Proposed Inspection Method:

Ultrasonic Phased Array

➢ Standard maintenance procedure: REMOVAL OF LANDING GEAR → Time consuming!!

PROPOSED SOLUTION: Phased-Array Ultrasound without landing gear removal!

Phased-Array Probe

Our proposal: Pulse-compression Phased-Array system

Advantages over standard Phased-array systems:• The use of advanced input

signals and processing (coded signals and pulse-compression) provides a higher detectability!

• LG replacement: c.a. 25 k€• 6 weeks unscheduled Aircraft on ground (AOG) 1000 k€ pax

compensation for Brussel Airlines • 750 k€ wet leased A/C

→ c.a. 1.75 M€ of saving per effected A/C

PROPOSED SOLUTION: Pulse-compression Phased-Array Ultrasonic testing without landing gear removal!

1. Received Rib from Lufthansa Technik2. Performing FE simulations3. Performing measurements on REAL Rib!4. Go to the hangar and measure in REAL environment!

Actual state of the investigation:

NOTE: the aim is NOT to replace current inspection methodology but to provide a handy tool for more frequents inspections!!

Water ingress

Loose rivets

Water Ingress detection with Thermography

Limitations:

▪ Detectability of water ingress is limited to “relatively-thin” composite parts.

▪ Low detection capability - both standard heat modulation scheme (step-heating or long-pulse) and heat sources (air heater) are

employed.

▪ The data is not saved, and the movement is left to the human being as well as the data

assessment.

Proposed solutions:

• Employing suitable heat sources (low power LED chips or halogen lamps), advanced heat modulation scheme

and post-processing techniques for:

1) enhancing water ingress detection for thicker composite samples;

2) reducing power consumption.

An example of coded-modulated heat modulation:

400W LEDs chips Thermography Setup

The effectiveness of the proposed methodology has been proved for CFRP inspection!

Proposed solutions:

• Employing suitable heat sources (low power LED chips or Halogen Lamps), advanced heat modulation scheme

and post-processing techniques for:

1) enhancing water ingress detection for thicker composite samples;

2) reducing power consumption.

400W LEDs chips Thermography Setup

WITHOUT

Pulse-compression

!!!6 kJ flash head lamps (or even stronger) must be used with care!! Coded-modulated LED

chips + Pulse-compression provides the same results, and even better in some cases, but

with no risks for the user!!!

Water Ingress detection with ThermographyPulse-compression Thermography example

“Resurrezione” – Andrea MantegnaAccademia Carrara, Bergamo

Paintings on panel, end of 15th century Recently re-attributed to Andrea Mantegna, asthe upper half of a two-part paintings together

with “Discesa di Cristo al limbo”

Measurements made on-site during the restoration process

Many indications from time-analysis of thermograms: wood grain structure, nails &

grouts, cracks, preparation layer

Sold for 30 milion € !

T= 0.10 s

T= 0.35 s

T= 0.60 s

Water ingress

Loose rivets

RR Air Intake Noise panels inspection (once per year)

• 10 h of work• Hand-written records• Accuracy is very

subjective

• Inspection time: c.a. 30 min• Automated inspection• Objective Tomographic &

Digital data• Pixel Accuracy

• 95% time reduction for inspection!!!➢ Higher detection capability & more frequent inspections:

• big repairs → small repairs (-200 k€)• Less likely to ground A/C!!! • No spare part of inlet needed (70 k€/month) (rented)

95 % time saving → part of A-check?

Investigated applications: RR Air Intake Noise Panels

Water ingress

Loose rivets

Loose Rivets

- Mandatory inspection of AFT Cargo Door

- Inspect visually Loose/Lost/Missing Fasters

Loose Rivets

- Repetitive inspection ever 550 FC (flight cycle)

- Costs:

2,5 FC/day -> every 8 month!!!

Loose Rivets

- Repetitive inspection ever 550 FC (flight cycle)

- Costs: 40 hours/door/aircraft/every eight month

➢ BEL: 21 A/C x 2 doors x 8/12 month → 28 weeks

2,5 FC/day -> every 8 month!!!

Loose Rivets

- FLIR SC7000- Glued PZT- Sweep: 15-25 kHz- 10 images averaged

Defect detection in riveted AL

Loose Rivets

Loose rivet detection [1]Loose Rivets

Summary1. Immense need for innovative inspection methods2. Science & Safety3. Science & Safety & Cost Reduction4. Need for more automatic detection method

RESUME OF THE PROPOSED METHODS:➢ Pulse-compression Phased Array for Rib inspection without LG removal➢ Pulse-compression Thermography for water and noise panel inspection➢ Ultrasonic-stimulated Thermography for loose rivets

Conclusions

SummaryThis research has received

funding from the “NDTonAIR" project under the action: H2020-MSCA-ITN-2016- GRANT 722134.

www.ndtonair.eu

stefano.laureti@unipg.itlauretistefano@gmail.com

www.ndtonair.eu

Thanks for your attention!

Science @ MCC” - IATA€¦ · “Science @ MCC” Dr. Stefano Laureti1 Mr. Michael Stamm2, Mr....

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