
Jean BoulvertSil&Add
Jean Boulvert
PhD in Acoustics
CEO of Sil&Add - Design of Acoustic Products and Materials | PhD in Acoustics & Mechanical Engineer
About
18
Publications
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Introduction
After completing a PhD in Acoustics and a one-year post-doc, J. Boulvert now works for Sil&Add, a company that develops tailor-made acoustic solutions.
He specializes in research in acoustics of porous materials and resonant systems. He also has a strong background in mechanical engineering.
Sil&Add (French version): https://sil-et-add.fr
Sil&Add (English version): https://sil-et-add.fr/en
Additional affiliations
January 2021 - December 2021
Publications
Publications (18)
This presentation introduces an asymmetric metaporous treatment for sound absorption, i.e., simultaneous cancellation of reflection and transmission, in a lined duct. The treatment is 3D printed and composed of folded and detuned quarter-wavelength resonators filled by air or by porous media. The asymmetry of the treatment, i.e., the use of pairs o...
This work deals with wave absorption in reciprocal asymmetric scattering problem by addressing the acoustic problem of compact absorbers for perfect unidirectional absorption, flush mounted to the walls of wide ducts. These absorbers are composed of several side‑by‑side resonators that are usually of different geometry and thus detuned to yield an...
This presentation introduces an innovative window air inlets silencer. The product is intended for exterior installation, tailored to match the standard dimensions of window air inlets, specifically the slot through the window. It is designed to complement internal window air inlet equipment. The silencer's design encompasses multiple functionaliti...
This article presents a numerical optimization procedure of continuous gradient porous layer properties to achieve perfect absorption under normal incidence. This design tool is applied on a graded porous medium composed of a periodic arrangement of ordered unit cells allowing one to link the effective acoustic properties to its geometry. The best...
This presentation introduces compact asymmetric treatments for sound absorption, i.e., simultaneous cancellation of reflection and transmission, in a lined duct of constant cross section. The treatments are composed of side by side and sub-wavelength resonators. They are thus compact, which facilitates their practical use. The simplest asymmetric t...
This article explores, theoretically and experimentally, asymmetric absorbers made of detuned and folded quarter wavelength resonators filled with air or porous materials. When used as acoustic lining in ducts, their thickness can be sub-wavelength and they can be designed for perfect absorption in broad target frequency bandwidth. The considered f...
Open-cell materials are well-known for their low price, low weight, and broadband acoustic behavior. They form one of the most used class of acoustic treatments but suffer from a lack of versatility when made by conventional manufacturing processes. Recent advances in additive manufacturing allow to produce porous materials having a controlled micr...
Porous materials and metamaterials play a key role in sound absorbing and insulation solutions in acoustics. With the growing interest in additive manufacturing techniques, recent work has focused on the printing of porous and resonant structures for acoustic purposes. Usual metaporous surfaces/interfaces are generally built by periodically inserti...
This Letter reports a folded metaporous surface optimized to achieve sub-wavelength and broadband perfect absorption. Its unit cell is composed of four different helicoidal cavities filled by porous media, which are structured and quasi-isotropic micro-lattices with a variable lattice constant. The effective thickness and intrinsic losses of each h...
Cette thèse exploite certaines possibilités offertes par la fabrication additive pour concevoir et optimiser des traitements pour l'atténuation acoustique à base de matériaux poreux sous un nouvel angle. La fabrication additive permet de contrôler chaque pore d'un matériau individuellement. Le processus de conception de traitement poreux est chambo...
The design of graded and anisotropic materials has been of significant interest, especially for sound absorption purposes. Together with the rise of additive manufacturing techniques, new possibilities are emerging from engineered porous micro-structures. In this work, we present a theoretical and numerical study of graded and anisotropic porous ma...
Fichiers du logiciel de tranchage Simplify3D correspondant aux deux configurations
Ce document présente des conseils pour accélérer la fabrication des visières de protection par méthode FDM dans le cadre de la lutte contre la COVID-19.
Un cas pratique est présenté en guise d'exemple. Il s'agit de la "Visor frame Europre ISO838 v3" qui est imprimée en 15 min avec des paramètres optimisés au lieu de 60 min avec des paramètres de...
This document provides guidance on how to speed up the manufacture of FDM 3D printed protective visor shields for the control of COVID-19.
A practical case is presented as an example. It is the "Visor frame Europre ISO838 v3" which is printed in 15 min with optimized parameters instead of 60 min with basic parameters.
The tips were successfully t...
A comprehensive study of the acoustic absorption of sonic crystals composed by a regular arrangement of columns, with the sound wave propagating parallel to the crystals, was conducted. A model correlating the structure parameters with the parameters of the well-known JCAL acoustic model was developed. The absorption of structures with low and high...
The acoustic behavior of 3D printed micro-lattices is investigated to assess the impact of defects induced by the Fused Deposition Modeling technique on the parameters of the equivalent fluid medium. It is shown that the manufacturing process leads to three types of non-trivial defects: elliptical filament section , filament section shrinkage and f...
This work deals with the sound wave propagation modeling in anisotropic and heterogeneous media. The considered scattering problem involves an infinite layer of finite thickness containing an anisotropic fluid whose properties can vary along the layer depth. The specular transmission and reflection of an acoustic plane wave by such a layer is model...