Physically-driven Design of Health Indicators for

Physically-driven design of health indicators for diagnosis and prognosis :

• Réf
• ABG-119848
• Sujet de Thèse- 31/01/2024- Financement de l'Union européenne- Laboratoire Vibrations Acoustique- Lieu de travail- Lyon - Auvergne-Rhône-Alpes - France- Intitulé du sujet- Physically-driven design of health indicators for diagnosis and prognosis- Champs scientifiques- Sciences de l’ingénieur
• Mathématiques
• Mots clés- Signal processing, machine learning, statistics, applied mathematics Description du sujet : The PhD project is about the design of novel Health Indicators (HIs), considering explicitly the physics of degradation. HIs are fundamental quantities at the basis of current diagnosis and prognosis methodologies of machines (e.g. windturbines, turbomachines, etc.). Despite remarkable progresses in health monitoring boosted by new technologies (IoT, new sensors) and AI, most approaches still rely on the use of rudimentary HIs defined more than half a century ago, when the main motivation was to provide metrics that could be easily calculated with the low computational resources of that time. Many popular HIs have traded simplicity against physical relevance and, as a consequence, it turns out difficult to tailor them to monitor specific degradation processes. Rather paradoxically, HIs with limited informational content are used as the inputs of extremely sophisticated machine learning algorithms (such as regressors and classifiers), yet constituting the weakest link of the chain. The project will address the construction of a mathematical mapping from physical multidimensional quantities such as surface topology and local mechanical properties to a scalar metric that can be calculated from the measurement of the dynamic behavior of the structure. Models of tribology will be used to correlate the dynamic response of a structure to local properties of damaged surfaces of contact (gears, rolling element bearings). Fracture dynamics and fatigue models will be considered to construct metrics of damage. The methodologies will be tested, evaluated and validated experimentally using a testbench for fatigue analysis of rolling element bearings and tribometers.

Nature du financement :

• Financement de l'Union européenne Précisions sur le financement : Présentation établissement et labo d'accueil :

• Laboratoire Vibrations AcoustiqueLe Laboratoire Vibrations Acoustique, rattaché au département d’enseignement Génie Mécanique (GM) de l’Institut National des Sciences Appliquées (INSA Lyon) a été créé dans les années 70 pour répondre aux intérêts grandissants des industriels - notamment de l’industrie des transports - autour du lien entre la dynamique des structures et l’acoustique.

Depuis, les activités de recherche du LVA ont toujours été menées pour suivre et anticiper les problématiques des industriels. Ces activités s’organisent autour de 4 axes principaux: Chaque année, le LVA est impliqué dans de nombreux projets Européens, nationaux ou contractuels dans des domaines aussi variés que les transports, la construction navale, l’aéronautique, la santé, l’imagerie, le nucléaire ou l’électro-mécanique.

d’Acoustique (SFA). Il accueille des post-doctorants, des doctorants de l’école MEGA (Mécanique, Energétique, Génie Civil, Acoustique), des étudiants de Master 2 et des étudiants en Projet de Fin d’Etude du département GMC de l’INSA Lyon.

Site web : Intitulé du doctorat :

• Doctorat de mécanique, spécialité acoustique Pays d'obtention du doctorat :

• France Etablissement délivrant le doctorat :

• Université de Lyon Ecole doctorale :

• MEGA- Education Level: Master Degree or equivalent in Applied Mathematics or in Engineering

• Languages: FRENCH or ENGLISH

• Level: Excellent

• Eligibility criteria:

• Applicants must have not yet been awarded a doctoral degree. Researchers who have successfully defended their doctoral thesis but who have not yet formally been awarded the doctoral degree will NOT be considered eligible to apply.

• Applicants may not have resided or carried out their main activity (work, studies, etc.) in France for more than 12 months in the 3 years immediately before the call deadline (i.e., since 11 April 2020). Time spent as part of a procedure for obtaining refugee status under the Geneva Convention (1951 Refugee Convention and the 1967 Protocol), compulsory national service and/or short stays such as holidays are not taken into account.

• Applicants may not be already permanently employed by the chosen Research Host at the time of call deadline.- 31/12/2024