A5028768027- Acoustic Wave Phenomena Research
- Noise Effects and Management
- Hearing Loss and Rehabilitation
- Speech and Audio Processing
- Vehicle Noise and Vibration Control
- Aerodynamics and Acoustics in Jet Flows
- Wind and Air Flow Studies
- Ear Surgery and Otitis Media
- Structural Health Monitoring Techniques
- Ultrasonics and Acoustic Wave Propagation
- Ergonomics and Musculoskeletal Disorders
- Effects of Vibration on Health
- Fluid Dynamics and Vibration Analysis
- Reconstructive Facial Surgery Techniques
- Asphalt Pavement Performance Evaluation
- Vibration and Dynamic Analysis
- Structural Engineering and Vibration Analysis
- Cellular and Composite Structures
- Nasal Surgery and Airway Studies
- Vibration Control and Rheological Fluids
- Tactile and Sensory Interactions
- Hearing Impairment and Communication
- Hearing, Cochlea, Tinnitus, Genetics
- Multisensory perception and integration
- Railway Engineering and Dynamics
École de Technologie Supérieure
2016-2025
McGill University
2025
Institut de Recherche Robert-Sauvé en Santé et en Sécurité du Travail
2020
Université de Sherbrooke
2010-2015
Le Mans Université
2003-2010
Centre National de la Recherche Scientifique
2005-2010
Laboratoire d'Acoustique de l'Université du Mans
2005-2009
University of Maine
2008
The present paper proposes to investigate the links between microstructure of polyurethane foams and their sound absorbing efficiency, more specifically effect membranes closing cells. This study is based on complete characterization 15 foam with various cell sizes reticulation rates (i.e., open pore content): (i) properties (cell size Cs, strut thickness t, rate Rw…) from SEM pictures, (ii) nonacoustic parameters (porosity Φ, airflow resistivity σ, tortuosity α∞…) direct indirect methods....
This paper proposes simple semi-phenomenological models to predict the sound absorption efficiency of highly porous polyurethane foams from microstructure characterization. In a previous [J. Appl. Phys. 110, 064901 (2011)], authors presented 3-parameter model linking properties fully and partially reticulated isotropic (i.e., strut length l, thickness t, reticulation rate Rw) macroscopic non-acoustic parameters involved in classical Johnson-Champoux-Allard porosity ϕ, airflow resistivity σ,...
Porous materials are widely used for improving sound absorption and transmission loss of vibrating structures. However, their efficiency is limited to medium high frequencies sound. A solution low frequency behavior while keeping an acceptable thickness embed resonant structures such as Helmholtz resonators (HRs). This work investigates the acoustic performances a cellular porous material with two-dimensional periodic arrangement HR inclusions. model unit cell based on parallel transfer...
Complement to standard E2611-09 of the American Society for Testing and Materials [Standard Test Method Measurement Normal Incidence Sound Transmission Acoustical Based on Transfer Matrix (American Materials, New York, 2009)] is proposed in order measure normal incidence sound transmission loss materials a modified impedance tube using three-microphone two-load or one-load method. The two-microphone tube, where third microphone mounted movable hard termination. This method conceptually...
The validity of using the limp model for porous materials is addressed in this paper. derived from poroelastic Biot assuming that frame has no bulk stiffness. Being an equivalent fluid accounting motion frame, it fewer limitations than usual a rigid frame. A criterion proposed to identify which can be used. It relies on new parameter, stiffness influence (FSI), based material properties. critical values FSI under used are determined one-dimensional analytical modeling two boundary sets:...
Abstract Novel flexible polyurethane foams were successfully prepared from a renewable source, hydroxytelechelic natural rubber (HTNR) having different molecular weights (1000–3400 g mol −1 ) and variation of epoxide contents (EHTNR, 0–35% epoxidation) by one‐shot technique. The chemical cell structures as well physico‐mechanical, thermal, acoustic properties characterized compared with commercial polyol analogs. obtained HTNR based are open dimensions between 0.38 0.47 mm. HTNR1000 foam...
This paper deals with the prediction of macroscopic sound absorption behavior highly porous polyurethane foams using two unit-cell microstructure-based models recently developed by Doutres, Atalla, and Dong [J. Appl. Phys. 110, 064901 (2011); J. 113, 054901 (2013)]. In these models, material is idealized as a packing tetrakaidecahedra representative disordered network that constitutes frame. The non-acoustic parameters involved in classical Johnson-Champoux-Allard model (i.e., porosity,...
This letter proposes an experimental method to estimate the absorption coefficient of sound absorbing materials under a synthesized diffuse acoustic field in free-field conditions. Comparisons are made between experiments conducted with this approach, standard reverberant room method, and numerical simulations using transfer matrix method. With simple setup smaller samples than those required by standards, results obtained proposed approach do not exhibit non-physical trends provide...
The generalized cross correlation (GCC) is an efficient technique for performing acoustic imaging. However, it suffers from important limitations such as a large main lobe width noise sources with low frequency content or high amplitude of side lobes frequencies. Prefiltering operation the microphone signals by weighting function can be used to improve image. In this work, two functions based on PHAse Transform (PHAT) improvements are used. first adds exponent PHAT expression (ρ-PHAT), while...
The objective occlusion effect induced by bone-conducted stimulation refers to the low frequency acoustic pressure increase that results from occluding ear canal opening. This phenomenon is commonly interpreted as follows: sound “leaks” through earcanal opening and “trapped” device. instinctive interpretation misrepresents fundamental mechanism of related impedance already highlighted existing electro-acoustic models. However, these models simplify wall vibration (i.e., origin phenomenon) a...
Offering hearing protection devices (HPDs) to workers exposed hazardous noise is a control strategy often used prevent noise-induced loss (NIHL). However, HPDs are incorrectly and inconsistently, which explains their limited efficiency. Numerous models based on social cognition theories identify the significant factors associated with inconsistent HPD use aim improve training programs increase use. these do not detail (dis)comfort aspects originating from complex interactions between...