Search results for "Non destructive testing"

showing 3 items of 3 documents

Backcalculation of airport pavement moduli and thickness using the Lévy Ant Colony Optimization Algorithm

2016

Interpretation of NDTdata is crucial in any Airport Pavement Management System (APMS), in order to implement strategies to maintain airport pavementssince they allow to estimate their remaining life and related maintenance needs and activities. In this paper, the AntColony Optimization algorithmwasused for backcalculation of pavement moduli from surface deflection data. The algorithm’s performances are illustrated and improvement in prediction quality is demonstrated both in terms of goodness of fitness and computational effort. Moreover, it is proved that the proposed algorithm is also able to predict layer thicknesses, taking into account their variation too.

Engineeringmoduli backcalculation0211 other engineering and technologies020101 civil engineering02 engineering and technologyheuristic algorithm.0201 civil engineeringModuliDeflection (engineering)Nondestructive testing021105 building & constructionSettore ICAR/04 - Strade Ferrovie Ed AeroportiGeneral Materials ScienceFWD dataCivil and Structural Engineeringbusiness.industryAnt colony optimization algorithmsPavement managementBuilding and ConstructionAbstract interpretationRemaining lifeNon Destructive TestingbusinessSettore ICAR/08 - Scienza Delle CostruzioniAlgorithmairport pavement
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Contribution to the study and to the optimization of active thermographic process applied to surface crack detection

2017

The aim of this work is the detection of open and subjacent defects in metallic materials using laser-material interaction coupled with infrared thermography. This process is a possible alternative for magnetic particles testing and dye penetrant testing in the field of non-destructive testing. This work is divided into three main parties. At first, we have been interested in the characterization of optical and thermophysical properties of materials we used, in order to have good boundary conditions and also for the needs of temperatures fields measurements for validation. The second part concern the development of a numerical simulation model with two step approach: the first involves mode…

Non destructive testing[SPI.OTHER]Engineering Sciences [physics]/Other[ SPI.OTHER ] Engineering Sciences [physics]/OtherContrôle non destructif[SPI.OTHER] Engineering Sciences [physics]/OtherMatériauxLaserThermiqueMaterialNumerical experimental designThermographie infrarougeThermalInfrared thermographyPlans d'expériences numériques
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RGB Photoelasticity: Review and Improvements

2010

:  This paper considers the main developments of RGB photoelasticity with reference to the maximum measurable retardation. In this paper, a new procedure based on the standard error function evaluated on a subset of the calibration array is also proposed and experimentally tested. The experiments show that the filament lamp makes it possible to find retardations until approximately 4 fringe orders while the fluorescent lamp makes it possible to determine higher fringe orders (12 fringe orders in this paper) owing to the discrete spectrum of the source. The paper shows that, by using the incandescent lamp, the primary limiting factor is the lack of modulation of the R, G and B signals wherea…

PhysicsIncandescent light bulbPhotoelasticitybusiness.industryMechanical EngineeringFunction (mathematics)law.inventionSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineOpticsMechanics of MaterialslawModulationbirefringent materials digital photoelasticity experimental mechanics non destructive testing RGB methodNondestructive testingCalibrationRGB color modelSettore ING-IND/15 - Disegno E Metodi Dell'Ingegneria IndustrialebusinessFluorescent lampStrain
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