Spar disbond visualization in in-service composite UAV with ultrasonic propagation imager

Lee, Jung-Ryul; Cho, Chang Min; Park, Chan Yik; Truong, Chung Thanh; Shin, Hye Jin; Jeong, Hyomi; Flynn, Eric B.

doi:10.1016/j.ast.2015.05.010

Cited by 20 publications

(3 citation statements)

References 10 publications

(15 reference statements)

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“…The central wavenumber ν ¯ 0 is selected from a wavenumber range determined from the dispersion curve. 20–22 Although the bandwidth parameter has the smallest effect on the results of the UEM algorithm, some degree of fine adjustment can still provide an improvement.…”

Section: Resultsmentioning

confidence: 99%

Development of a long-range multi-area scanning ultrasonic propagation imaging system built into a hangar and its application on an actual aircraft

Shin

Lee

2016

Structural Health Monitoring

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Materials such as aluminum alloys and carbon composites are widely used in aircraft structures. In the case of the use of Al-alloys in aircraft structures, fatigue cracks occur because of excessive and repeated loading and vibrations experienced during frequent flights. Meanwhile, composite materials are also damaged—for example, impact damage and debonding—and have defects, including voids, prepreg gaps, and overlaps created during the manufacturing process. Ultrasonic propagation imaging is a damage visualization technique that is used in structural inspections employing a laser scanning system and ultrasonic sensors. However, conventional ultrasonic propagation imaging or other scanning systems, such as a scanning laser Doppler vibrometer, only permit a single area to be inspected at one time. It is also difficult to inspect inaccessible areas, such as the upper skins of the aircraft wings. In this work, we describe a multi-area scanning ultrasonic propagation imaging system built in a hangar that is able to rapidly scan at a pulse repetition rate of 20 kHz. After acquiring the generated ultrasonic wave signal induced by laser excitation, ultrasonic propagation imaging videos for the in-plate guided wave are displayed. Finally, internal damage can be identified in a damage visualization platform. The developed multi-area scanning ultrasonic propagation imaging system is demonstrated by performing simultaneous inspections on two areas containing manufacturing defects in a large carbon/epoxy laminate. We also performed a demonstration of the hangar-based multi-area scanning ultrasonic propagation imaging system on an actual aircraft containing back surface cracks. The multi-area scanning ultrasonic propagation imaging system with tilting mirror systems installed in the hangar ceiling permitted a clear visualization of the damage. The damage visualization results confirm that the proposed multi-area scanning ultrasonic propagation imaging system and approach have excellent applicability as a built-in ultrasonic propagation imaging system for a Smart Hangar, which is a future structural health monitoring solution that will be used to realize a full-scale structural inspection of an actual aircraft.

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Section: Resultsmentioning

confidence: 99%

Development of a long-range multi-area scanning ultrasonic propagation imaging system built into a hangar and its application on an actual aircraft

Shin

Lee

2016

Structural Health Monitoring

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“…To identify oil pipeline failures that cause oil leakage due to interference from third parties, unmanned aerial vehicles (UAVs) with infrared cameras and image processing systems can be implemented. Several researchers [20], [21], [22], [23] have designed UAVs with good results in their performances.…”

Section: Introductionmentioning

confidence: 99%

Análisis aerodinámico de un vehículo aéreo no tripulado con forma de halcón para monitoreo de fugas de hidrocarburos

et al. 2021

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The oil pipeline network requires periodic monitoring to detect pipeline damages, which may cause oil leakage with severe environmental contamination. These damages can be generated by interference from third parties such as construction works, sabotage, vandalism, excavations,and illegal oil theft. Todetect the oil pipeline damages,it canbeusedaerodynamic aerial vehicles (UAVs) with infrared cameras and image processing systems. This paperpresents the aerodynamic analysis of a UAV with a hawk shape (wingspan of 2.20 m and length of 1.49 m) for potential application in the detection of oil pipeline failures. A 1:6.5 scale prototype of the UAV is fabricated using a 3D printer. The aerodynamic coefficients of UAV are determined using computational fluiddynamic (CFD) simulations and experimental testing with a subsonic wind tunnel. In addition, the lift and drag coefficients of UAVsare obtained as a function of Reynolds number and angle of attack. Also, the air velocity profile around UAV is estimated with the CFD model. The proposed UAV could decrease the inspection costs of pipeline networks in comparison with the use of helicopters or light aircraft.

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“…A source at a fixed position generates ultrasonic waves in a test medium, and a contactless scanning receiver, typically a laser Doppler vibrometer (LDV), collects the corresponding ultrasonic wave responses across a predefined spatial sampling grid on the surface [2,5,6]. A reciprocal hardware configuration for fixed sensing and scanning ultrasound generation can also be used [7,8]. Using the scanning measurement data sets, video-like ultrasonic wavefield images are generated, where the interaction between propagating ultrasonic waves and inhomogeneities within a test medium can be observed and intuitively understood.…”

Section: Introductionmentioning

confidence: 99%

Contactless Ultrasonic Wavefield Imaging to Visualize Near-Surface Damage in Concrete Elements

Song

Popovics

2019

Applied Sciences

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We present work to detect and visualize near-surface damage in concrete using contactless ultrasonic wavefield imaging technology. A fully contactless ultrasonic scanning system that utilizes a micro-electro-mechanical systems (MEMS) ultrasonic microphone array is used to collect ultrasonic surface wave data from a concrete sample. The obtained wavefield data sets are processed with a frequency-wavenumber (f-k) domain wavefield filtering approach to extract non-propagating oscillatory fields set up by near-surface concrete cracking damage. The experimental results demonstrate that near-surface concrete damage can be detected and visualized using the proposed ultrasonic wavefield imaging approach.

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Spar disbond visualization in in-service composite UAV with ultrasonic propagation imager

Cited by 20 publications

References 10 publications

Development of a long-range multi-area scanning ultrasonic propagation imaging system built into a hangar and its application on an actual aircraft

Development of a long-range multi-area scanning ultrasonic propagation imaging system built into a hangar and its application on an actual aircraft

Análisis aerodinámico de un vehículo aéreo no tripulado con forma de halcón para monitoreo de fugas de hidrocarburos

Contactless Ultrasonic Wavefield Imaging to Visualize Near-Surface Damage in Concrete Elements

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