Pierre Maréchal
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View article: Effective bulk and mass densities of randomly distributed coated cylinders in fluid
Effective bulk and mass densities of randomly distributed coated cylinders in fluid Open
Inhomogeneous media made of random configurations of coated circular cylinders are considered. The effective properties—wave number, mass density, bulk modulus—are discussed and illustrated. The effects of the volume fraction of the scatte…
View article: Decoding pixels: A modular software prototype for cognitive image-based diagnostics of PV plants
Decoding pixels: A modular software prototype for cognitive image-based diagnostics of PV plants Open
Although aerial infrared (aIRT) imagery-based solutions for diagnostics of PV plants demonstrate impressive time-efficiency and spatial resolution, they also suffer from considerable drawbacks: limited automation (hence, expert dependence)…
View article: Air traffic classification using convolutional neural networks
Air traffic classification using convolutional neural networks Open
International audience
View article: High-resolution ultrasonic characterization of an adhesive film in an aeronautical assembly
High-resolution ultrasonic characterization of an adhesive film in an aeronautical assembly Open
In recent years, the increasing use of composite materials in aeronautical structures to reduce weight has led to a growing interest in non-destructive testing of adhesive joints. Such inspections aim to detect defects such as porosity or …
View article: Determination of ageing indicators on glass-fiber polyester composite skins using Lamb guided waves
Determination of ageing indicators on glass-fiber polyester composite skins using Lamb guided waves Open
This paper investigates the structural integrity of glass fibre reinforced polymer (GFRP) composites used in offshore wind turbine blades. Samples of two thicknesses (4-plies and 6-plies) undergo accelerated ageing inside tanks full of sea…
View article: Integrated analysis of materials for offshore wind turbine blades: mechanical and acoustical coupling
Integrated analysis of materials for offshore wind turbine blades: mechanical and acoustical coupling Open
This work focuses on assessing the structural degradation of offshore wind turbine blade (OWTB) materials caused by exposure to the marine environment using acoustic and mechanical methods. Samples, consisting of a glass fibre reinforced p…
View article: Inverse problem-solving method applied to acoustic characterisation of a thin film using Debye series model
Inverse problem-solving method applied to acoustic characterisation of a thin film using Debye series model Open
In this paper, it is proposed to solve an inverse problem with the perspective of determining the ultrasonic properties (thickness, longitudinal wave velocity, density and attenuation coefficient) of a thin epoxy resin film deposited on a …
View article: The UAV Feasibility Trajectory Prediction Using Convolution Neural Networks: Wind direction and uncertainty are crucial in aircraft or unmanned aerial vehicle trajectories. By computing wind covariance matrices on each spatial grid point, these spatial grids can be defined as images with symmetric positive definite matrix elements. A data pre-processing step, a specific convolution, a specific max-pooling, and specific flatten layers are implemented to process such images. Then, the neural network is applied to spatial grids, whose elements are wind covariance matrices, to solve classification problems related to the feasibility of unmanned aerial vehicles based on wind direction and wind uncertainty.
The UAV Feasibility Trajectory Prediction Using Convolution Neural Networks: Wind direction and uncertainty are crucial in aircraft or unmanned aerial vehicle trajectories. By computing wind covariance matrices on each spatial grid point, these spatial grids can be defined as images with symmetric positive definite matrix elements. A data pre-processing step, a specific convolution, a specific max-pooling, and specific flatten layers are implemented to process such images. Then, the neural network is applied to spatial grids, whose elements are wind covariance matrices, to solve classification problems related to the feasibility of unmanned aerial vehicles based on wind direction and wind uncertainty. Open
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View article: Assessing acoustic performance of building material: A finite element model for 3D printed multilayer micro-perforated panels with compressed earth blocks
Assessing acoustic performance of building material: A finite element model for 3D printed multilayer micro-perforated panels with compressed earth blocks Open
This study deals with 3D printing multilayered micro-perforated panels (M-MPPs) coupled with buildings materials as compressed earth block for noise reduction applications. The sound absorption coefficient α is utilized as a metric to asse…
View article: Mechanical and ultrasound characterizations of aging of blade materials in marine environment
Mechanical and ultrasound characterizations of aging of blade materials in marine environment Open
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View article: Metaheuristic for Optimal Dynamic K-Coloring Application on Band Sharing for Automotive Radars
Metaheuristic for Optimal Dynamic K-Coloring Application on Band Sharing for Automotive Radars Open
The number of vehicles equipped with radars on the road has been increasing for years and is expected to reach 50% of cars by 2030. This rapid rise in radars will likely increase the risk of harmful interference, especially since radar spe…
View article: Regularization of the inverse Laplace transform by Mollification
Regularization of the inverse Laplace transform by Mollification Open
In this paper we study the inverse Laplace transform. We first derive a new global logarithmic stability estimate that shows that the inversion is severely ill-posed. Then we propose a regularization method to compute the inverse Laplace t…
View article: Phenomenological model for predicting thermoelectromechanical response of 2-2 piezocomposite
Phenomenological model for predicting thermoelectromechanical response of 2-2 piezocomposite Open
The homogenization of piezocomposites is a research challenge as the development of analytical models remains a challenge. In this perspective, this work contributes to the development of an analytical model to predict the thermoelectromec…
View article: A mollifier approach to regularize a Cauchy problem for the inhomogeneous Helmholtz equation
A mollifier approach to regularize a Cauchy problem for the inhomogeneous Helmholtz equation Open
The Cauchy problem for the inhomogeneous Helmholtz equation with non-uniform refraction index is considered. The ill-posedness of this problem is tackled by means of the variational form of mollification. This approach is proved to be cons…
View article: Acoustic Splitter Waves Based on Ramified System Made of Waveguides
Acoustic Splitter Waves Based on Ramified System Made of Waveguides Open
In this paper, we studied the propagation of acoustic waves in an acoustic ramified system. Our proposed system contains an input waveguide of length d0 and three output lines (three channels), each output line contains a semi-infinite wav…
View article: Electric control of a phononic crystal constituted of Piezoelectric layers using Schottky diode
Electric control of a phononic crystal constituted of Piezoelectric layers using Schottky diode Open
A one-dimensional piezoelectric phononic crystal (PPC) consisting of a periodic pattern made of two perfectly bonded materials: one active (piezoelectric), the other passive (elastic) and exhibiting a strong acoustic impedance contrast is …
View article: A MOLLIFIER APPROACH TO THE DECONVOLUTION OF PROBABILITY DENSITIES
A MOLLIFIER APPROACH TO THE DECONVOLUTION OF PROBABILITY DENSITIES Open
We use mollification to regularize the problem of deconvolution of random variables. This regularization method offers a unifying and generalizing framework in order to compare the benefits of various filter-type techniques like deconvolut…
View article: Generalized homogenization model of piezoelectric materials for ultrasonic transducer applications
Generalized homogenization model of piezoelectric materials for ultrasonic transducer applications Open
Although piezocomposite (PC) materials have increasingly attracted researchers, there is still a need to properly and easily derive their properties. We develop a generalized homogenization model (GHM) that accounts for Smith and Cha appro…
View article: On the Simulation of the Influence of Defects on Immersed Plane Periodic Multilayer Viscoelastic Media
On the Simulation of the Influence of Defects on Immersed Plane Periodic Multilayer Viscoelastic Media Open
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View article: Acoustical Surface Characterization of PP/OWF Composite Plates
Acoustical Surface Characterization of PP/OWF Composite Plates Open
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View article: Thermal ageing evaluation of composite plates through electromechanical impedance
Thermal ageing evaluation of composite plates through electromechanical impedance Open
International audience
View article: SID and STAR routes optimization near large airports
SID and STAR routes optimization near large airports Open
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View article: Piezocomposite transducer design and performance for high resolution ultrasound imaging transducers
Piezocomposite transducer design and performance for high resolution ultrasound imaging transducers Open
Piezocomposite design for dedicated ultrasonic imaging applications requires precise homogenization models for predicting the electromechanical characteristics of the new material. Thus, several homogenization models have been developed. A…