Francesco Lanza di Scalea
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View article: High resolution ultrasonic imaging of extended targets via combined match field and time delay beamforming
High resolution ultrasonic imaging of extended targets via combined match field and time delay beamforming Open
Ultrasound imaging using an active sensing array has been extensively studied in both time domain and frequency domain. Subspace decomposition methods in match field beamforming such as the multiple signal classification (MUSIC) algorithm …
View article: Application of Sparse Synthetic Aperture Focusing Techniques to Ultrasound Imaging in Solids Using a Transducer Wedge
Application of Sparse Synthetic Aperture Focusing Techniques to Ultrasound Imaging in Solids Using a Transducer Wedge Open
This article discusses the application of sparse synthetic aperture focusing techniques (SAFTs) for fast and accurate ultrasonic nondestructive testing (NDT) imaging of solids in cases where a wedge is required between the transducer array…
View article: An ultrasonic scanning system for the inspection of composite stiffened panels from elastic constant identification via inversion of guided waves
An ultrasonic scanning system for the inspection of composite stiffened panels from elastic constant identification via inversion of guided waves Open
This paper describes an ultrasonic scanning system for the inspection of stiffened composite panels used in modern aircraft construction based on elastic constant identification. Conventional ultrasonic scanning systems track individual fe…
View article: Influence of Varying Operational Parameters on the Defect Detection Performance of a High-Speed Ultrasonic Rail Inspection System During Field Tests
Influence of Varying Operational Parameters on the Defect Detection Performance of a High-Speed Ultrasonic Rail Inspection System During Field Tests Open
Background Continuous monitoring is essential for detecting internal defects in rails and prevent derailment related accidents. Existing techniques do not facilitate continuous monitoring because they require specialized test cars and can …
View article: The role of evanescent modes in global-local analysis of ultrasonic guided waves in plates with varying local zone-scatterer relations
The role of evanescent modes in global-local analysis of ultrasonic guided waves in plates with varying local zone-scatterer relations Open
In order to provide a reliable and robust SHM performance, Ultrasonic Guided Waves (UGWs) need to be analyzed and understood. Numerical modeling of UGW propagation and scattering by hybrid methods offers the possibility of simulating UGW i…
View article: Railroad Sleeper Condition Monitoring Using Non-Contact in Motion Ultrasonic Ranging and Machine Learning-Based Image Processing
Railroad Sleeper Condition Monitoring Using Non-Contact in Motion Ultrasonic Ranging and Machine Learning-Based Image Processing Open
An ultrasonic sonar-based ranging technique is introduced for measuring full-field railroad crosstie (sleeper) deflections. Tie deflection measurements have numerous applications, such as detecting degrading ballast support conditions and …
View article: Global–local model for three-dimensional guided wave scattering with application to rail flaw detection
Global–local model for three-dimensional guided wave scattering with application to rail flaw detection Open
This study presents a three-dimensional global–local formulation for the prediction of guided wave scattering from discontinuities (e.g. defects). The approach chosen utilizes the Semi-Analytical Finite Element method for the “global” port…
View article: Minimum-Variance Imaging in Plates Using Guided-Wave-Mode Beamforming
Minimum-Variance Imaging in Plates Using Guided-Wave-Mode Beamforming Open
This article presents improvements to ultrasonic imaging of solid platelike structures using the minimum-variance distortionless response (MVDR) beamforming processor. The primary application of this work is in the nondestructive testing (…
View article: Improved global-local model to predict guided-wave scattering patterns from discontinuities in complex parts
Improved global-local model to predict guided-wave scattering patterns from discontinuities in complex parts Open
Ultrasonic guided-wave testing can greatly benefit from (1) an ability to provide quantitative information on the damage that is being detected, and (2) an ability to select the best mode-frequency combination for maximum sensitivity to a …
View article: Stretchable ultrasonic transducer arrays for three-dimensional imaging on complex surfaces
Stretchable ultrasonic transducer arrays for three-dimensional imaging on complex surfaces Open
Ultrasound adds the third dimension to wearable sensors.
View article: Non-Destructive Inspection of Impact Damage in Composite Aircraft Panels by Ultrasonic Guided Waves and Statistical Processing
Non-Destructive Inspection of Impact Damage in Composite Aircraft Panels by Ultrasonic Guided Waves and Statistical Processing Open
This paper discusses a non-destructive evaluation (NDE) technique for the detection of damage in composite aircraft structures following high energy wide area blunt impact (HEWABI) from ground service equipment (GSE), such as heavy cargo l…
View article: A match coefficient approach for damage imaging in structural components by ultrasonic synthetic aperture focus
A match coefficient approach for damage imaging in structural components by ultrasonic synthetic aperture focus Open
Ultrasonic Synthetic Aperture Focus (SAF) techniques are commonly used to image structural defects. In this paper, a variation of SAF based on ideas borrowed from Matched Field Processing (MFP) is evaluated to reduce artifacts and sidelobe…
View article: Detection of major impact damage to composite aerospace structures by ultrasonic guided waves and statistical signal processing
Detection of major impact damage to composite aerospace structures by ultrasonic guided waves and statistical signal processing Open
The detection of major damage to composite aerospace structures, specifically damage to skins, stringers and frames, remains a challenge of NDE tests performed from the skin side. Damage to the internal structures can be caused, for exampl…
View article: Advances in Ultrasonic Imaging for Internal Flaws in Structures
Advances in Ultrasonic Imaging for Internal Flaws in Structures Open
In the field of non-destructive testing of structures, 3D imag- ing of internal flaws is a critical task. Defect imaging allows the engineer to make informed follow-up decisions based on the morphology of the flaw.
This paper will p…
View article: Isogeometric Fatigue Damage Prediction in Large-Scale Composite Structures Driven by Dynamic Sensor Data
Isogeometric Fatigue Damage Prediction in Large-Scale Composite Structures Driven by Dynamic Sensor Data Open
In this paper, we combine recent developments in modeling of fatigue-damage, isogeometric analysis (IGA) of thin-shell structures, and structural health monitoring (SHM) to develop a computational steering framework for fatigue-damage pred…
View article: Nonlinear guided wave propagation in prestressed plates
Nonlinear guided wave propagation in prestressed plates Open
The measurement of stress in a structure presents considerable interest in many fields of engineering. In this paper, the diagnostic potential of nonlinear elastic guided waves in a prestressed plate is investigated. To do so, an analytica…