# R. PannetonMecanum Inc, and Université de Sherbrooke · Mechanical Engineering Department

R. Panneton

Ph.D.

## About

181

Publications

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3,611

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Citations since 2017

Introduction

Development of simulation models and characterization methods for acoustic materials.
Modeling, characterization and design of conventional and unconventional acoustic materials.
Conventional acoustic materials: foam, fibrous, granular, perforated plates.
Unconventional acoustic materials: natural fibers, recycled materials, metamaterials.
Simulation methods: analytical, numerical, transfer matrices, finite and boundary elements, thermo-visco-acoustics.
Characterization methods: porosimeter, resistivity meter, ultrasonic tortuosimeter, mechanical analyzer, impedance and acoustic transmission tube, Oberst beam.

Additional affiliations

June 1998 - present

## Publications

Publications (181)

A transfer matrix approach that combines with finite element calculations is proposed to characterize homogeneous and non-homogeneous acoustic absorbing materials with in-plane periodicity. The characterized acoustic materials are mainly metamaterials made of multiple layers, where at least one layer consists of a non-homogeneous material (NHM). Th...

This article proposes a hybrid numerical-analytical approach to effectively predict the sound absorption coefficient of complex periodic metamaterials with a reasonably low computation time. A variation of an existing metamaterial, consisting of a periodic succession of necks and cavities, is also proposed. The design variation was intended to decr...

The noise control at multiple tonal frequencies simultaneously, in the low frequency range, is a challenge for aerospace, ground transportation and building industries. In the past few decades, various low frequency noise control solutions, based on acoustic metamaterials designs, have been presented in the literature. The proposed technologies sho...

More frequently, recent low-frequency noise control techniques commonly implemented in aerospace and ground transportation as well as in building applications are based on acoustic metamaterial concepts. The technologies proposed in the literature, using layered porous materials with embedded Helmholtz resonators (HR), exhibited considerable potent...

The noise control at multiple tonal frequencies simultaneously, in the low frequency range, is a challenge for aerospace, ground transportation and building industries. In the past few decades, various low frequency noise control solutions based on acoustic metamaterial designs have been presented in the literature. These solutions showed promising...

As standard ASTM E2611 reveals, the normal incidence sound transmission loss measured on a small sample in an acoustic tube is not only a property of the material but also strongly dependent on boundary conditions (generally unknown) and on the way the material is mounted. This article proposes an experimental method to control the effects of the l...

The paper presents the design and the acoustic properties evaluation of complex shape metamaterials. Complex metamaterials are a better alternative to conventional acoustic materials to absorb acoustic energy at low frequencies when the available volume is limited. Moreover these metamaterials are well adapted for harsh environments (high temperatu...

Over the past few decades, various low frequency noise control technology concepts incorporating acoustic metamaterials have been proposed in the literature. The proposed technologies showed promising performance, with a significant noise attenuation rate per thickness unit and are considered as an improved solution when compared to conventional so...

*** Also view video at: https://www.youtube.com/watch?v=2gyBYHsDJgs ***
Porous materials everywhere in the Universe! At the Planck length scale (10e-33 cm), physicists describe space as a quantum foam. At the cosmic scale (> 10e26 cm), galaxies are distributed according to the structure of a cosmic foam. Closer to the human scale, natural porous...

The transport and sound absorption properties of random close packings of monodisperse spherical particles are explored following a multiscale approach. First, the discrete element method is used to simulate the free fall of the monodisperse particles in a bounded domain to create virtual samples that are representative of real samples. Different p...

The thickness of a dissipative fluid (or equivalent fluid in the case of a porous material) for which its acoustic absorption coefficient reaches an asymptotic value is reviewed. This thickness is called critical depth or penetration depth. It is approximately equal to two or three times the relaxation depth at which the amplitude of a sound pressu...

This paper examines the capability of both the Proper Orthogonal Decomposition (POD) and the Singular Value Decomposition (SVD) to identify the zones on the surface blades of a centrifugal fan that contribute the most to the sound power radiated by moving blades. The Computational Fluid Dynamics (CFD) OpenFOAM\(^{\textregistered }\) source code is...

This work investigates the validity of recent micro-macro solid fibre relationships for the case of a nonwoven fibre structure made from milkweed floss, a natural hollow fibre. The hypothesis that hollowness of the fibre has only small effects on the acoustics of the material is verified. This is done to ensure that the use of a single porosity
mod...

There is a considerable number of research publications on the acoustical properties of porous media with an elastic frame. A simple search through the Web of Science™ (last accessed 21 March 2018) suggests that there are at least 819 publications which deal with the acoustics of poroelastic media. A majority of these researches require accurate kn...

The acoustic properties of an air-saturated porous material depend on its microstructure and the thickness of the sample. Thick samples of conventional acoustic materials are required to achieve good absorption at low frequencies. This study suggests a new micro-structure for the design of low-frequency resonant acoustic absorbers. A perforated mat...

The ability of air-saturated fibrous media to mitigate sound waves is controlled by their transport properties that are themselves controlled by the geometrical characteristics of their microstructure such as the open porosity, fiber radius, and fiber orientation. Here, micro-macro relationships are proposed to link these microstructural features t...

It was shown recently in Nevers, France, Sherbrooke, Canada and Salford, UK, that porous materials with semi-opened pores or materials with open pores bearing lateral cavities or resonators at the microscopic scale of the pores can result in peculiar sound absorption properties. Various examples of these materials can be found in engineering and in...

The ability of air‐saturated fibrous media to mitigate sound waves is controlled by their transport properties. The objective is to propose micro‐/macro relationships to link microstructural features to macroscopic transport properties of random fiber structures, with a view to predict their acoustic properties. The three-step methodology is: 1) Ge...

A poroelastic characterization of open-cell porous materials using an impedance tube is proposed in this paper. Commonly, porous materials are modeled using Biot’s theory. However, this theory requires several parameters which can be difficult to obtain by different methods (direct, indirect or inverse measurements). The proposed method retrieves a...

The main purpose of this article is to present, within a unified framework, a technique based on numerical homogenization, to model the acoustical properties of real fibrous media from their geometrical characteristics and to compare numerical results with experimental data. The authors introduce a reconstruction procedure for a random fibrous medi...

This presentation examines a perforated resonant material, in which the principal perforations comprise a network of periodically spaced dead-end pores. This material can show good sound absorption at low frequencies, particularly given its relatively small thickness. In a recent study, this kind of material was modeled by an effective fluid approa...

The ability of fibrous media to mitigate sound waves is controlled by their transport properties that are themselves greatly affected by the geometrical characteristics of their microstructure such as porosity, fiber radius, and fiber orientation. Here, the influence of these geometrical characteristics on the anisotropictransport properties of ran...

The purpose of this research is to determine whether the acoustic properties of polydisperse fibrous medium (PDFM) and bidisperse fibrous medium (BDFM) can be modeled by monodisperse fiber media (MDFM) with an effective fiber diameter. Multi-scale numerical simulations on representative elementary volumes of these media are performed to retrieve th...

This paper examines the use of proper orthogonal decomposition (POD) and singular value decomposition (SVD) to identify zones on the surface of the source that contribute the most to the sound power the source radiates. First, computational fluid dynamics (CFD) is used to obtain the pressure field at the surface of the blade in a subsonic regime. T...

The acoustic properties of an air-saturated macroscopically inhomogeneous aluminum foam in the equivalent fluid approximation are studied. A reference sample built by forcing a highly compressible melamine foam with conical shape inside a constant diameter rigid tube is studied first. In this process, a radial compression varying with depth is appl...

The purpose of this paper is to propose a vibro-acoustic modeling of a snowmobile suspension in order to determine the elements and transfer paths that contribute most to the global noise of this mechanical system. Two approaches, Transfer Path Analysis (TPA) and Operational Transfer Path Analysis (OTPA) are compared. The first one consists in usin...

A new method for processing and analyzing noise data from a snowmobile on a test bench is proposed and applied to compare the sound levels of two different CVT models. Because of the important dependency of the noise to the engine speed, the signal is analyzed through a relatively simple algorithm so as to be automatically associated to the engine...

In this paper, an approach to predict the sound absorption coefficient and sound transmission loss of a parallel assembly of hollow cylinders is presented. This approach is based on image processing and the Parallel Transfer Matrix Method (PTMM) using four Johnson–Champoux–Allard effective fluids. First, effective parameters of each fluid are ident...

This paper presents the human resources and infrastructure available at Groupe d'Acoustique de l'Université de Sherbrooke (GAUS) located in Sherbrooke, QC, for research and development in acoustics. GAUS was founded by Jean Nicolas in 1984 and is now recognized worldwide as one of the leading research groups in acoustics and vibration, with a team...

A theoretical and numerical study of the sound propagation in air-saturated porous media with straight pores bearing lateral cavities (dead-ends) is proposed. The straight pores can be considered as the main (Biot) pores. The lateral cavities are located at " nodes " periodically spaced along each " main pore " axis. The effect of periodicity in th...

A theoretical and numerical study of the sound propagation in air-saturated porous media with straight main pores bearing lateral cavities (dead-ends) is presented. The lateral cavities are located at "nodes" periodically spaced along each main pore. The effect of periodicity in the distribution of the lateral cavities is studied, and the low frequ...

Recently, an extension of the transfer matrix method (TMM) to calculate absorption coefficient and
transmission loss of acoustic systems in parallel (one next to each other and not one after the other)
has been published [1]. This method (P-TMM) is based on the continuity of flow and pressure on each
side of the stack. To comply with these constrai...

The transfer matrix method (TMM) is used conventionally to predict the acoustic properties of laterally infinite homogeneous layers assembled in series to form a multilayer. In this work, a parallel assembly process of transfer matrices is used to model heterogeneous materials such as patchworks, acoustic mosaics, or a collection of acoustic elemen...

A theoretical and experimental study of the acoustic properties of porous materials containing dead-end (or partially opened) porosity was recently proposed by Dupont, Leclaire, Sicot, Gong, and Panneton [J. Appl. Phys. 110, 094903 (2011)]. The present article provides a description of partially opened porosity systems and their numerous potential...

Foreseeing a permanent settlement on the moon, the astronauts will need a rover to explore the lunar environment on a daily basis. The goal of this project is to develop a new wheel that is able to provide more control, comfort, and drawbar pull in order to safely reach remote areas. Following a thorough design method, a new concept of flexible whe...

A simple equivalent fluid model is proposed to describe the acoustic behavior of post-consumer and post-industrial recycled fibers otherwise known as Shoddies. The model requires knowledge of the bulk density only, a parameter that is easily measured. Characterization testing was completed on nine Shoddy fiber constructions processed by one of thre...

This work presents how the equations by Salissou and Panneton [ J. Appl. Phys. 101, 124913 (2007), http://dx.doi.org/10.1063/1.2749486] are modified to considered two gases. First gas being air for low pressure, second gas being used for high pressure. This is motivated by the fact the low pressure tests may be performed following opening of the te...

See the corrected version in RG as " Technical Note on Open Porosity Measurement by the Pressure-Mass Method Corrected for a Two-Gas Mixture"

In this note, the one-dimensional acoustical wave propagation is considered to study normal incidence coupled poroelastic-fluid problems. For this case, a 2x2 transfer matrix is derived from the general 6x6 transfer matrix for poroelastic medium as described in the Allard and Atalla's book [1].

This study presents a method to measure the acoustic properties of a homogeneous porous material with a support or a reduction element in an acoustic tube. Some materials tested have a lateral size much smaller than the tube's diameter, as they cannot be produced in the correct dimensions without corrupting the material; this also permits the testi...

The Transfer Matrix Method (TMM) is used conventionally to predict the acoustic properties of laterally infinite homogeneous layers assembled in series to form a multilayer. In this work, a parallel assembly process of transfer matrices is used to model heterogeneous materials such as patchworks, acoustic mosaics, or a collection of acoustic elemen...

The paper discusses the absorption of certain materials with different acoustic properties used in a nacelle of aircraft is investigated using numerical model. A model 2-D with the configuration of axisymmetrical and the differential equations of the Continuity and Helmholtz equation is realized, it couples a finite element description with a bound...

The acoustic properties of porous materials containing dead-end (DE) pores have been proposed by Dupont et al. [J. Appl. Phys. 110, 094903 (2011)]. In the theoretical description, two physical parameters were defined (the dead-end porosity and the average length of the dead-end pores). With the knowledge of the open porosity (measured with non-acou...

Open-cell porous materials are used for soundproofing and noise control. Engineers simulate their performance in different applications using state-of-the-art prediction software. To define these materials, up to ten (10) material properties are required following the Biot-Allard poroelasticity model. There are 6 non-acoustical parameters (open por...

This paper presents a straightforward application of an indirect method based on a three-microphone impedance tube setup to determine the non-acoustic properties of a sound absorbing porous material. First, a three-microphone impedance tube technique is used to measure some acoustic properties of the material (i.e., sound absorption coefficient, so...

In the Department of Mechanical Engineering at the Université de Sherbrooke, several professors and researchers are pooling complementary expertise in acoustics and vibration in a University research center, the Acoustics Group of the Université de Sherbrooke (GAUS). This pooling of expertise and infrastructure provides an environment conducive to...

Complement to standard E2611-09 of the American Society for Testing and Materials [Standard Test Method for Measurement of Normal Incidence Sound Transmission of Acoustical Materials Based on the Transfer Matrix Method (American Society for Testing and Materials, New York, 2009)] is proposed in order to measure normal incidence sound transmission l...

This paper deals with the modeling of the acoustic behavior (absorption and transmission) of an acoustic mosaic having heterogeneous surface properties. On the surface, the material can be viewed as a collection of independent cells reacting locally. Each cell is filled with an absorbent material different from its neighbors. Such a mosaic may be s...

A new nonlinear impedance model of a micro-perforated panel (MPP) is developed using an equivalent fluid concept, which is relatively easy to integrate into the Transfer Matrix Method (TMM) to predict performance of multiple MPP sound absorbers. The nonlinear model is proposed to change the linear-end correction of the acoustic mass in terms of tor...

This study examines the acoustic properties of materials with complex micro-geometry containing partially open or dead-end (DE) porosity. One of these kinds of materials can be obtained from dissolving salt grains embedded in a solid metal matrix with the help of water. The solid matrix is obtained after the metal, in liquid form, has invaded the g...

Switchgrass is a tall grass plant largely present in North America and especially in Canada. It grows from rhizomes and is characterized by stems that can reach, like bamboo or sugarcane, up to 2 meters high. Moreover, its roots can be as deep as 2 meters. It is important to mention that during the measurement, samples were not compressed. The only...

This article aims at investigating the sound insulation property of composites made of recyclable thermoplastic charged with heavy particles. Polyethylene (PE) is the most used thermoplastic polymer worldwide. Behind this generic name lies several types of PE, where linear low density polyethylene (LLDPE) is the most common one. Metal particles are...

The acoustic behavior of shoddies is not well understood when compared to more ubiquitous porous materials such as fiberglass and certain polymeric foams. Designers must therefore rely on predictive models that are either highly complex or simpler models developed for different materials. The effect can be mitigated by using a larger test sample, h...