Laser ultrasonic anomalous wave propagation imaging method with adjacent wave subtraction: Application to actual damages in composite wing

Chia, Chen Ciang; Lee, Jung-Ryul; Park, Chan-Yik; Jeong, Hyomi

doi:10.1016/j.optlastec.2011.08.007

Cited by 57 publications

(30 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, from the machine learning perspective, it is difficult for the recognition of the damages since it is required to analyse multiple frames of the wave propagation to make a decision. Second, in the case when the object has a complex internal structure, such as a honeycomb sandwich plate with a thick aluminium core inside, the damages are barely recognised if using merely the wave propagation images [20].…”

Section: Damage Detection Using Ultrasonic Wavenumber Imaging Algorithmmentioning

confidence: 99%

Comparative Study of Laser Doppler Vibrometer and Capacitive Air‐coupled Transducer for Ultrasonic Propagation Imager and the New Development of an Efficient Ultrasonic Wavenumber Imaging Algorithm

Truong

Kang

Lee

et al. 2015

Strain

View full text Add to dashboard Cite

Damage detection techniques using guided waves have been studied for decades with very few successful real-world applications. The recent development with the full wavefield technique using the Ultrasonic Propagation Imager (UPI) is one of those few exceptions. In this paper, we study two non-contact sensors: the laser Doppler vibrometer and the capacitive air-coupled transducer in the context as the sensing modules for the UPI. The aim of this paper is to provide a comprehensive study for optimisation of the two sensors, as well as a comparison between them for use in the UPI. First, the parameters for laser ultrasonic measurement of each sensor were studied: surface treatment, measurement angle and stand-off distance in the case of the laser Doppler vibrometer and measurement angle, lift-off distance and bias voltage in the case of the capacitive air-coupled transducer. Two optimised sensors were then compared in terms of their ability to detect damages using the UPI. Also, in this paper, we presented the ultrasonic wavenumber imaging (UWI) algorithm with the new development towards an efficient implementation. The uniqueness of the UWI algorithm with the capability of damage size estimation makes this algorithm very attractive for the future study with full wavefield signal processing.

show abstract

Section: Damage Detection Using Ultrasonic Wavenumber Imaging Algorithmmentioning

confidence: 99%

Comparative Study of Laser Doppler Vibrometer and Capacitive Air‐coupled Transducer for Ultrasonic Propagation Imager and the New Development of an Efficient Ultrasonic Wavenumber Imaging Algorithm

Truong

Kang

Lee

et al. 2015

Strain

View full text Add to dashboard Cite

show abstract

“…The information on the impact events and locations is valuable for the SHM system in KASHMOS project [9]. Using the ultrasonic propagation imaging method [9,14], the areas of interest that is predicted through the current approach can be scanned and damage in the surface or subsurface structures can be precisely detected.…”

Section: Advanced Composite Materials 363mentioning

confidence: 99%

Localizations and force reconstruction of low-velocity impact in a composite panel using optical fiber sensors

Park

Kim

Jun

et al. 2012

Advanced Composite Materials

View full text Add to dashboard Cite

A new approach of monitoring low-velocity impact events on composite structures was presented and experimentally evaluated. In this approach, impact strain histories of a composite plate were measured with optical fiber sensors. The recorded signals were used to estimate locations and forces of low-velocity impact events. For experimental validation, four-sensor heads were surface mounted at the four corners of a composite panel. The optical sensors caught dynamic strain due to impacts on the panel, and the optical cables transmitted wavelength changes of the sensors. The multiplexed wavelength changes were measured using a high-speed fiber Bragg grating interrogator for the determination of impact location. The locations of impact events were estimated using a neural network program and measured signals. The estimated locations and converted strain signals were taken as the inputs to the process of reconstructing impact forces. Even though the current study is an initial investigation on a simple impact problem, the result shows the possibility that the proposed technique can be applied to low-velocity impact monitoring of general composite structures.

show abstract

“…Aiming at further damage visibility and operability, a visualization method of ultrasonic wave propagation [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] has been developed. In this method, ultrasonic waves are generated by illuminating a specimen surface with a pulsed laser and are received by a fixed transducer [14].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the reciprocity of wave propagation [15], the amplitude of each waveform at a particular time plotted in a contour map yields a moving diagram of the wave propagation from the receiver. The feasibility of this method was demonstrated by applying it to a crack and an artificial hollow in metallic materials [15], delamination in carbon fiber reinforced plastic (CFRP) laminates [16][17][18][19][20], a crack in welded steel plates [21], and disbonds in adhesively bonded CFRP/aluminum joints [22]. Frequency and/or wavenumber domain analysis using the Fourier-or wavelet-transform was introduced into ultrasonic propagation imaging to easily interpret the visualized results of wave propagation by isolating a specific frequency mode [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Topology Optimization-Based Damage Identification Using Visualized Ultrasonic Wave Propagation

et al. 2019

View full text Add to dashboard Cite

This study proposes a new damage identification method based on topology optimization, combined with visualized ultrasonic wave propagation. Although a moving diagram of traveling waves aids in damage detection, it is difficult to acquire quantitative information about the damage, for which topology optimization is suitable. In this approach, a damage parameter, varying Young’s modulus, represents the state of the damage in a finite element model. The feature of ultrasonic wave propagation (e.g., the maximum amplitude map in this study) is inversely reproduced in the model by optimizing the distribution of the damage parameters. The actual state of the damage was successfully estimated with high accuracy in numerical examples. The sensitivity of the objective function, as well as the appropriate penalization exponent for Young’s modulus, was discussed. Moreover, the proposed method was applied to experimentally measured wave propagation in an aluminum plate with an artificial crack, and the estimated damage state and the sensitivity of the objective function had the same tendency as the numerical example. These results demonstrate the feasibility of the proposed method.

show abstract

Laser ultrasonic anomalous wave propagation imaging method with adjacent wave subtraction: Application to actual damages in composite wing

Cited by 57 publications

References 5 publications

Comparative Study of Laser Doppler Vibrometer and Capacitive Air‐coupled Transducer for Ultrasonic Propagation Imager and the New Development of an Efficient Ultrasonic Wavenumber Imaging Algorithm

Comparative Study of Laser Doppler Vibrometer and Capacitive Air‐coupled Transducer for Ultrasonic Propagation Imager and the New Development of an Efficient Ultrasonic Wavenumber Imaging Algorithm

Localizations and force reconstruction of low-velocity impact in a composite panel using optical fiber sensors

Topology Optimization-Based Damage Identification Using Visualized Ultrasonic Wave Propagation

Contact Info

Product

Resources

About