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Dive into the research topics where Marc-André Gaudreau is active.

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Featured researches published by Marc-André Gaudreau.


Annals of Occupational Hygiene | 2012

Measurement of hearing protection devices performance in the workplace during full-shift working operations.

Hugues Nélisse; Marc-André Gaudreau; Jérôme Boutin; Jérémie Voix; Frédéric Laville

OBJECTIVES The effectiveness of hearing protection devices (HPDs), when used in workplace conditions, has been shown over the years to be usually lower than the labeled values obtained under well-controlled laboratory conditions. Causes for such discrepancies have been listed and discussed by many authors. This study is an attempt to understand the issues in greater details and quantify some of these factors by looking at the performance of hearing protectors as a function of time during full work shift conditions. METHODS A non-invasive field microphone in the real ear (F-MIRE)-based method has been developed for measuring the effectiveness of different HPDs as a function of time in the workplace. Details of the test procedures, the equipment used, and the post-processing operations are presented and discussed. The methodology was developed in such a way that a complete time and frequency representation are possible. The system was used on a total of 24 workers in eight different companies. Work shifts of up to 9-h long were recorded. Various types of earmuffs and one type of molded earplugs were tested. RESULTS Attenuation data reported as a function of time showed, for most workers tested, considerable fluctuations over entire work shift periods. Parts of these fluctuations are attributed to variations in the low-frequency content in the noise (in particular for earmuffs) as well as poor insertion and/or fitting of earplugs. Lower performances than laboratory-based ones were once again observed for most cases tested but also, important left and right ear differences were obtained for many individuals. When reported as a function of frequency, the attenuation results suggested that the few approximations used to relate the measurements to subjective real-ear-attenuation-at-threshold (REAT) data were realistic. CONCLUSIONS The use of individualized attenuation data and performance ratings for HPDs as well as a good knowledge of the ambient noise in the workplace are key ingredients when evaluating the performance of hearing protectors in field conditions.


Journal of the Acoustical Society of America | 2017

Comparison of time domain noise source localization techniques: Application to impulsive noise of nail guns

Thomas Padois; Marc-André Gaudreau; Olivier Doutres; Franck Sgard; Alain Berry; Pierre Marcotte; Frédéric Laville

Microphone array techniques are an efficient tool to detect acoustic source positions. The standard technique is the delay and sum beamforming. In the time domain, the generalized cross correlation of the microphone signals is used to compute the Spatial Likelihood Functions (SLF) of all microphone pairs and the noise source map is provided by the arithmetic mean of these functions. To improve the former noise source map, which means narrowing the main lobe and removing side and spurious lobes, several techniques have been developed in the past. In this work, the performances of three of these techniques (in terms of source position detection, amplitude estimation and computation time) are compared in the case of both synthetic and real data: (1) energetic and geometric criteria are applied in order to remove the SLF with useless information, (2) the arithmetic mean is replaced by the generalized mean and (3) linear inverse problem is solved with sparsity constraint. In the case of real data, the source t...


Journal of the Acoustical Society of America | 2017

Attenuation of dual hearing protection: Measurements and finite-element modeling

Hugues Nélisse; Franck Sgard; Marc-André Gaudreau; Thomas Padois

In extremely noisy environments, it is normally recommended to use a combination of earplug and earmuff, denoted here as a dual protection, to protect workers from the excessive noise. Unfortunately, it has been shown repeatedly that the attenuation values obtained with the dual protection are generally less than the sum of the individual earplug and earmuff attenuation values. In the literature, this is generally explained by the bone conduction path and the coupling between the earplug and the earmuff. However, there is much less work devoted to examining in detail the coupling between the earplug and the earmuff. In this work, experimental results on human subjects and on an artificial text fixture are collected using REAT and MIRE procedures for different combinations of earmuffs and earplugs. Additionally, a finite-element model is used to investigate the physics of the problem and to better understand the nature of the coupling between the earplug and the earmuff when used in a dual configuration. R...


Journal of the Acoustical Society of America | 2008

Variability of hearing protection devices attenuation as a function of source location

Hugues Nélisse; Marc-André Gaudreau; Jérémie Voix; Jérôme Boutin; Frédéric Laville

It is of common knowledge, and well documented, that laboratory-measured noise attenuation values of most hearing protection devices (HPD) exceed significantly the attenuation values obtained in real-world workplace environments. Various reasons may explain such discrepancies (lack of training, wearing time, lack of comfort, bad fitting, noise environments, etc.) but very few of them have been studied in details due to the complexity of the problem. This study focuses on the variability of the attenuation of HPDs as a function of the location of the noise source. Laboratory measurements were performed where subjects, wearing a HPD and facing a loudspeaker, were asked to rotate slowly on a rotating chair to simulate dierent angular positions of the head relative to the source. The protected and unprotected sound pressure signals for both ears were recorded as time signals using miniature microphones placed respectively inside and outside the HPD (FMIRE technique). The microphones signals were processed to obtain attenuation values for the dierent angular positions. Results for dierent type of HPD (ear-mus and ear-plugs) are presented and discussed.


Canadian Acoustics | 2008

Méthode de mesures terrain de l'atténuation F-MIRE de protecteurs auditifs durant un quart de travail

Marc-André Gaudreau; Frédéric Laville; Hugues Nélisse; Jérémie Voix


Applied Acoustics | 2017

A finite element model to improve noise reduction based attenuation measurement of earmuffs in a directional sound field

Marc-André Gaudreau; Franck Sgard; Frédéric Laville; Hugues Nélisse


Archive | 2007

Variabilité de l'atténuation des protecteurs auditifs mesurée par la méthode field-mire en fonction de la direction du son incident et des bruits du porteur

Marc-André Gaudreau; Frédéric Laville; Jérémie Voix; Hugues Nélisse


Archive | 2007

A preliminary study on the measurement of effective hearing protection device attenuation during a workshift

Hugues Nélisse; Marc-André Gaudreau; Jérémie Voix; Frédéric Laville


Archive | 2009

Real world HPD attenuation : a new field measurement method using F-MIRE and time signals

Marc-André Gaudreau; Frédéric Laville; Jérémie Voix; Hugues Nélisse; Jérôme Boutin


Archive | 2008

État de l'art et perspectives sur la mesure des performances effectives des protecteurs auditifs en milieu de travail

Marc-André Gaudreau; Frédéric Laville; Jérémie Voix; Hugues Nélisse

Collaboration


Dive into the Marc-André Gaudreau's collaboration.

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Frédéric Laville

École de technologie supérieure

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Hugues Nélisse

Institut de recherche Robert-Sauvé en santé et en sécurité du travail

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Jérémie Voix

École de technologie supérieure

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Jérôme Boutin

Institut de recherche Robert-Sauvé en santé et en sécurité du travail

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Franck Sgard

Institut de recherche Robert-Sauvé en santé et en sécurité du travail

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Pierre Marcotte

Institut de recherche Robert-Sauvé en santé et en sécurité du travail

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Thomas Padois

École de technologie supérieure

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Olivier Doutres

École de technologie supérieure

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Alain Berry

Université de Sherbrooke

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Cécile Le Cocq

École de technologie supérieure

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