航空资料40(2)

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Cessna Facilities
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M&P Engineering - NDE
 ADVANCED TECHNOLOGY - AD, Experimental,
Manufacturing and process sensing support
 Support process specifications
 Evaluate new methods of testing & inspection
 Support implementation of new techniques/technologies
 NDE SUSTAINING - Design review, DADT support, test
article support
 Engineering drawing review
 Define NDI requirements for service-related inspections
 Inspection support for component test articles
 PRODUCTION OPERATIONS – Support for NDI
methods at all facilities
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Citation NDI Certification / Licensing
 Citation NDI Certification Program
 Established in 1985 to ensure independent facilities/personnel meet Cessna NDI
requirements (reflects NDT industry standards).
 Provides Citation owners/operators a means to confirm a facilities NDI
qualifications.
 103 Facilities Worldwide.
 61 Independent Domestic Facilities
 34 International Facilities
 8 Service Centers
 NDI License Program
 Established May 2001 wherein Cessna owns all Citation NDI calibrations
standards.
 Cessna provides control over the use and distribution of the standards.
 Preserves intent of the Certification Program.
 Ensures only approved NDI facilities are performing inspections.
 Ensures standards are controlled, certified and documented.
 Eliminates expensive acquisition costs for customers.
 Pay on a per use basis - easy to understand ROI.
 Mitigates Quality Control issues and lead times.
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NDE Methods
 Liquid Penetrant
 Magnetic Particle
 Radiography
 Eddy Current (arrays)
 Ultrasonic (Squirter, Air-coupled, Manual, PAUT)
 Six 2.5D UT squirter gantries (up to 50’)
 Air-coupled UT – 8 ch high speed flat scanner (Prod) & 2 ch (Expr
 Shearography (6x6x20’ vacuum chamber w/heat excitation &
robot scanner)
 Scanners
 GenScan free-scan system with Mimeo feedback
 2-axis portable scanner for UT & ET
 MOI
 Thermography (PE & TTU)
 Acoustic Emission (16 ch)
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Cessna Gantry UT Systems
 Gantries w/up to four TTU nozzle pairs and 28 ips
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Cessna Air-coupled UT System
 Reduced inspection time
 Well-suited for composite or metal bond
 Inspected over 2M sq. ft. of bonded assemblies since installed in ’00.
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Projects
 Slight Hidden Corrosion in thin metal bonded
structures
 RFEC, ET array, phased array UT
 Multi-Layer Cracking – up to 4 layers 1.25” thick
 Pulsed Eddy Current, RFEC, MS & GMR
 Angle beam UT scanning w/portable scanner & instrument
 Physical Test Monitoring
 Acoustic Emission
 Metal Bond Process Monitoring
 PAA/Bond Primer Thickness Automated anodize trace analysis
 Semi-automated contamination detection system
 Residual stress after cold-working
 NDE Modeling
 Technique optimization
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EC Modeling
Single crack, A,B,C
BEM07 General General tight/open
Single crack, A,B,C
PLATE07 Multi-layers General tight/open
MEC03 Plate/Halfspace Air-core Complex (a) B,C
Model Part Probe Flaw Output (b)
(a) Flaw type: “Complex” = multi-ligament cracking, open or tight.
(b) Output options: A = incident EC fields, B = part geometry signal, C = flaw signal
Iowa State University CNDE
0.1 mm gap
0.060”
0.100”
0.150”
0.050”
0.250”
0.050”
0.004” gap 0.250”
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UT Modeling
 Model can predict voltage of the defect echo, given info about the metal
(density, velocity, surface), defect (size, shape, location) and system
(waterpath, probe characteristics, reference echo, etc.).
 Diffraction, attenuation, transmission/ reflection coefficients, near/far
fields, freq. dependencies, focused or flat probes, lenses & mode
conversions
 SNR estimates can be made if noise properties of the microstructure are
known (UT scatterer model for grain noise)
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X-ray Modeling
 Simulation can predict radiographic density of various
materials, flaw composition, flaw geometry
 POD estimation for 3D components with multiple
　
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