Antoine Falaize

La Rochelle Université · Laboratoire des Sciences de l’Ingénieur pour l’Environnement - LaSIE

In this article we study the possibilities of recovering the structure of port-Hamiltonian systems starting from ``unlabelled'' ordinary differential equations describing mechanical systems. The algorithm we suggest solves the problem in two phases. It starts by constructing the connectivity structure of the system using machine learning methods --...

This article investigates reduced-order models (ROMs) based on proper orthogonal decomposition for efficient computation of the homogenized diffusion properties of saturated porous media. The homogenized tensor, whose classical expression may be obtained from periodic homogenization techniques, is computed by solving a local problem on an elementar...

An extension of the well‐known Neville‐Aitken’s algorithm for interpolation on the Grassmann manifold Gm.(ℝn) in the framework of parametric model order reduction is presented. Interpolation points on Gm.(ℝn) are the subspaces spanned by bases obtained by Proper Orthogonal Decomposition (POD) of available solutions associated with the chosen parame...

The electrodynamic loudspeaker couples mechanical, magnetic, electric and thermodynamic phenomena. The Thiele/Small (TS) model provides a low frequency approximation, combining passive linear (multiphysical or electric-equivalent) components. This is commonly used by manufacturers as a reference to specify basic parameters and characteristic transf...

The interpolation on Grassmann manifolds in the framework of parametric evolution partial differential equations is presented. Interpolation points on the Grassmann manifold are the subspaces spanned by the POD bases of the available solutions corresponding to the chosen parameter values. The well-known Neville-Aitken's algorithm is extended to Gra...

This paper deals with the construction of reduced order models (ROMs) for the simulation of the interaction between a fluid and a rigid body with imposed rotation velocity. The approach is a follows. First, we derive a monolithic description of the fluid–structure interaction by extending the Navier–Stokes equations from the fluid domain to the sol...

This paper deals with the time-domain simulation of an electro-mechanical piano: the Fender Rhodes. A simplified description of this multi-physical system is considered. It is composed of a hammer (nonlinear mechanical component), a cantilever beam (linear damped vibrating component) and a pickup (nonlinear magneto-electronic transducer). The appro...

We present a method that generates passive-guaranteed stable simulations of analog audio circuits from electronic schematics for real-time issues. On one hand, this method is based on a continuous-time power-balanced state-space representation structured into its energy-storing parts, dissipative parts, and external sources. On the other hand, a nu...

Les systèmes audios incluent les instruments de musique traditionnels (percussions, cordes, vents, voix) et les systèmes électro-acoustiques (amplificateurs de guitares, pédales d’effets, synthétiseurs analogiques). Ces systèmes multi-physiques possèdent une propriété commune : hors des sources d’excitation (les générateurs), ils sont tous passifs....

This paper presents a method for the passive guaranteed simulation of a class of finite-dimensional nonlinear port-Hamiltonian systems. This method combines two processes to reach both the second order accuracy and explicit computations. First, we design a one-step two- stage implicit numerical method for Port-Hamiltonian systems that preserves pas...

cote interne IRCAM: Falaize14c

cote interne IRCAM: Falaize13a

This paper investigates how precise a model should be for a robust model-based NMF analysis of piano recordings. While inharmonicity is an essential feature of piano tones from a perceptual point of view, its explicit inclusion in sound models is not straightforward and may even damage the quality of the analysis. Here, we assess the quality of the...