Design of a guided wave absorber for Structural Health Monitoring system development

Bilodeau, Maxime; Quaegebeur, Nicolas; Masson, Patrice

doi:10.1016/j.ndteint.2017.03.003

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…Experimentally, the sample is similar to the one studied in the simulations: the aluminum bar has the crosssection described in section ''Propagating guided modes in rectangular bars'' and has the same mechanical properties and is 1.2 m long. In addition, absorbing paste 55 is added on the aluminum bar edges to prevent reflections.…”

Section: Methodsmentioning

confidence: 99%

Selective generation of ultrasonic guided waves in a bi-dimensional waveguide

Serey

Quaegebeur

Micheau

et al. 2018

Structural Health Monitoring

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Non-destructive testing and structural health monitoring systems based on ultrasonic guided waves propagation are particularly used in civil engineering or aerospace applications. Guided waves are commonly employed as they propagate through large distances and can inspect the entire cross-section of the structure. In order to optimize the sensitivity to a specific damage type, it is often preferable to generate a carefully selected pure mode. Although single-mode generation has been achieved for Lamb waves in infinite plate-like structures, such generation is much harder in a rectangular bar since less conventional modes propagate in finite cross-section waveguides. This article presents a general methodology for mode selective generation in a finite cross-section waveguide, using multiple transducers. Obtaining modal identification through conventional spatial Fourier transform on a longitudinal scan has proven to be inconvenient for waveguides with a two-dimensional cross-section. An alternative technique is proposed, consisting in the decomposition over the modal basis of the three displacement components measured across the bar width at the bar surface. The methodology is applied to the single-mode generation within an aluminum bar instrumented with eight piezoelectric transducers bonded to the surface. The modal basis is obtained with a semi-analytical finite element method. Numerical simulations and experiments using a three-dimensional laser Doppler vibrometer are conducted in order to validate the methodology.

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Section: Methodsmentioning

confidence: 99%

Selective generation of ultrasonic guided waves in a bi-dimensional waveguide

Serey

Quaegebeur

Micheau

et al. 2018

Structural Health Monitoring

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“…Measurements are performed using a Polytec 3D laser-Doppler vibrometer (3D-LDV) that monitors velocities in the three directions at the upper surface over a given set of points. In addition, absorbing paste 43 is added to the bar ends to suppress unwanted reflections, and retro-reflective spray is applied to the upper surface of the monitored zone to improve signal-to-noise ratio (SNR).…”

Section: Methodsmentioning

confidence: 99%

Selective generation of ultrasonic guided waves for damage detection in rectangular bars

Serey

Quaegebeur

Rénier

et al. 2020

Structural Health Monitoring

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Ultrasonic guided waves are used in non-destructive testing and structural health monitoring solutions for long-range inspection, in applications ranging from Civil Engineering to Aerospace. In order to ease the inspection process, it is generally preferable to generate a carefully selected single mode. Although single mode Lamb wave generation is not difficult to achieve in infinite plate-like structures, with carefully polarized or sized piezoceramic elements, for example, such selective generation is much more difficult in a rectangular bar. In this article, we consider the propagation along a thin plate of finite rectangular cross section, which corresponds to a rectangular bar. The finite lateral width leads to a greater density of modes compared to an infinite plate. The authors have previously addressed this matter and developed a methodology for the selective generation of modes in the harmonic regime. This article extends this methodology to selective mode generation for finite time excitation, such as bursts. Results are presented for single mode generation of A0,0 and A0,1 in an aluminum bar instrumented with eight piezoelectric transducers. The waveguide modal basis is calculated with the two-dimensional semi-analytical finite element method, and measurements are conducted using a three-dimensional laser-Doppler vibrometer. To illustrate the potential of the method for structural health monitoring purposes, the detection of a defect simulated by a pair of magnets placed at various positions over the bar width is demonstrated.

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“…The design of the monitoring system directly bears on the implementation effect. The key to the system design lies in the physical and logical integration between sensor subsystems with different functions, which lays the basis for the central control of data acquisition, storage, preprocessing and remote transmission of all sensors [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Linux-Based Integrated Structural Health Monitoring System for Bridges in Remote Regions

Yan¹,

Wu²,

Wu³

et al. 2019

I2M

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This paper aims to design a stable, reliable, energy-efficient yet low-cost structural health monitoring (SHM) system for bridges in remote regions. First, the integrated system design was adopted based on the Linux architecture, and the power-efficient opensource hardware was taken as the mini Linux PCs on the bridge site. Next, several sensor subsystems were integrated physically via the Ethernet, while nine core software modules were developed based on opensource software and integrated into a logical whole. The stability of the system was improved through dual PC redundancy and intelligent fault diagnosis. The data collected by sensors were analyzed in real time and only the valid data and alarms were transmitted to the remote monitoring center. In addition, the remote transmission and active control were completed, with the aid of 3G/4G router, VPN and reverse SSH tunneling. In this way, the author developed an easy-to-maintain and cost-efficient SHM system. Finally, the effectiveness of the system was verified through the application in a bridge on an expressway in Yunnan Province, China. The results fully demonstrate the robustness, accuracy and cost effectiveness of the proposed system. This research fills up the gap in Linux-based SHM system design for bridges in remote regions, providing a reliable and advanced reference for the construction of bridge SHM systems.

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Design of a guided wave absorber for Structural Health Monitoring system development

Cited by 6 publications

References 23 publications

Selective generation of ultrasonic guided waves in a bi-dimensional waveguide

Selective generation of ultrasonic guided waves in a bi-dimensional waveguide

Selective generation of ultrasonic guided waves for damage detection in rectangular bars

A Linux-Based Integrated Structural Health Monitoring System for Bridges in Remote Regions

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