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Probabilistic modeling by finite elements of the acoustic response of hearing protectors excited by impulse industrial noise

ABG-105264 Thesis topic
2022-05-02 Other public funding
École de technologie supérieure
Montreal - Canada
Probabilistic modeling by finite elements of the acoustic response of hearing protectors excited by impulse industrial noise
  • Engineering sciences
  • Mathematics
  • Health, human and veterinary medicine
acoustics, hearing protection, ear, modeling, impulse noise

Topic description

Context : The selection of a hearing protector, the last bastion to protect against exposure to noise, is mainly based on the acoustic attenuation it can provide. While knowledge on the attenuation of hearing protectors for continuous noise has progressed in recent years, that on attenuation for industrial impulse noise is less advanced both in terms of metrology and in terms of modeling. A model relaxing the limits of existing models and allowing for a better understanding of the transmission of waves in the ear/protector system with a view in particular to improving the design of protectors and the methods for measuring their performance against impulse noise is lacking. Recent progress made on the numerical modeling of hearing protection for continuous noises and the increasing use in other applications of the Bayesian formalism integrating all the uncertainties of the problem, make it possible to consider the development of such a model. It is in this perspective of designing a probabilistic model by finite elements (FE) of the acoustic response of the auditory canals of a human head, equipped or not with a protector, excited by impulse industrial noises and including all the transmission paths through tissues, that a research program is proposed. This research program is divided into four specific objectives: OS1) Model the acoustic response of the unprotected ear; OS2) Model the acoustic response of hearing protectors; OS3) Model the acoustic response of the ear coupled to a protector; OS4) Exploit FE models to understand the mechanisms of sound transmission in the earcanal open or occluded by a protector, taking into account uncertainties.

Subject of the Ph.D. project: This topic tackles the specific objectives OS2 and OS4 and consists in developing a probabilistic model by FE of the sound transmission of industrial impulse noise through different types of protectors. The corresponding FE models will be calibrated/validated in a Bayesian framework from experimental data provided by simplified test benches and will be used to study the underlying mechanisms of sound transmission.

Main tasks : In addition to carrying out his·her doctoral project in compliance with the rules of research ethics, the student will contribute to the writing of deliverables (e.g., articles, presentations, reports) and will be encouraged to present his·her work at international scientific conferences.

Funding category

Other public funding

Funding further details

CRSNG/MITACS/IRSST

Presentation of host institution and host laboratory

École de technologie supérieure

The Ph.D. will be carried out at the École de Technologie Supérieure de Montréal (ÉTS) within a dynamic, multidisciplinary and internationally recognized research team in the field of hearing protection. Located in the heart of Montreal, the ÉTS campus is easily accessible by bike or public transit. Often described as an attractive mix of North American and European culture, Montreal, since 2016, has consistently ranked as the best student city in North America according to Quacquerilli Symonds.

The student will have access to the ICAR laboratory (http://gram.etsmtl.ca/equipment/), at the cutting edge of technology where experimental infrastructures, offices, meeting rooms, spaces for relaxation and exchanges are grouped together, promoting collaborative work. The thesis will be co-supervised by Dr. Franck Sgard from the IRSST, associate professor at ÉTS, and Prof. O. Doutres from ÉTS.

PhD title

Doctorat en génie mécanique

Country where you obtained your PhD

Canada

Institution awarding doctoral degree

École de technologie supérieure

Candidate's profile

This project includes both modeling and experimental aspects. The candidate must have the equivalent of a master's degree in engineering or physics. A background in acoustics, finite element modeling, mathematics (probabilities, statistics), design, measurement and Matlab programming is recommended. He/she must (i) be able to communicate in French and/or English, both orally and in writing (ii) enjoy working in a team and (iii) know how to meet deadlines.

2022-07-29
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