Giorgio Pasquettaz | Fiat Powertrain Technologies - Centro Ricerche Fiat (FTP-CRF) (original) (raw)

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Papers by Giorgio Pasquettaz

International Congress on Applications of Lasers & Electro-Optics, 2006

On line quality monitoring, in industrial plants, is an open field for signal processing applicat... more On line quality monitoring, in industrial plants, is an open field for signal processing application. In this paper we explore the method of reassignment for extracting information from signals detected during the laser welding process. The reassignment method was first applied to the spectrogram by Kodera, Gendrin and de Villedary [22, 23] and later generalized to any bilinear time-frequency representation by Auger and Flandrin [24]. Key to the method is a nonlinear convolution where the value of the convolution is not placed at the center of the convolution kernel but rather reassigned to the center of mass of the function within the kernel. The resulting reassigned representation yields significantly improved components localization. We briefly recall the fundamental concepts of the theory of time-frequency representations, discussing some time-frequency distributions, after that we review the reassignment method. Finally we compare the proposed time-frequency distributions by analyzing signals detected during the laser welding of tailored blanks, demonstrating the advantages of the reassigned representation, giving practical applicability to the proposed method.On line quality monitoring, in industrial plants, is an open field for signal processing application. In this paper we explore the method of reassignment for extracting information from signals detected during the laser welding process. The reassignment method was first applied to the spectrogram by Kodera, Gendrin and de Villedary [22, 23] and later generalized to any bilinear time-frequency representation by Auger and Flandrin [24]. Key to the method is a nonlinear convolution where the value of the convolution is not placed at the center of the convolution kernel but rather reassigned to the center of mass of the function within the kernel. The resulting reassigned representation yields significantly improved components localization. We briefly recall the fundamental concepts of the theory of time-frequency representations, discussing some time-frequency distributions, after that we review the reassignment method. Finally we compare the proposed time-frequency distributions by analyzing signals detecte...

The patent refers to a new system for quality analysis of laser welding which is reference free

L'invention porte sur un module de surveillance de processus industriels, destine a etre util... more L'invention porte sur un module de surveillance de processus industriels, destine a etre utilise dans un systeme de surveillance de processus industriels, ledit module comprenant des moyens de detection (7; 17) destines a detecter une ou plusieurs valeurs de processus dans au moins un poste du processus (20), des moyens d'acquisition (8, 32; 32'; 32'') destines a acquerir des signaux de mesure (R) emis par lesdits moyens de detection (7; 17), des moyens de traitement (9; 19) traitant les signaux (T; T1) generes par lesdits moyens d'acquisition (8, 32; 32'; 32'') afin d'obtenir des informations sur la qualite du processus, et des moyens de gestion du flux de production (9; 19), qui agissent sur la base desdites informations relatives a la qualite du processus et qui sont localises dans un poste de travail (50) eloigne dudit poste de processus, ledit module de surveillance (30) etant configure pour etre installe localement au niveau du ou des po...

Procedia Manufacturing, 2017

IFIP Advances in Information and Communication Technology, 2016

Ims2020 Proceedings from the Ims2020 Summer School on Sustainable Manufacturing, Dec 15, 2010