High Fidelity Modeling of Bladed Disk/casing Systems

1 month ago

Montréal QC, Canada École Polytechnique de Montréal Full time

**High fidelity modeling of bladed disk/casing systems**:

- Réf **ABG-126933**
- Sujet de Thèse- 15/11/2024- Contrat doctoral- École Polytechnique de Montréal- Lieu de travail- Montréal - Canada- Intitulé du sujet- High fidelity modeling of bladed disk/casing systems- Champs scientifiques- Sciences de l’ingénieur
- Mots clés- vibrations, nonlinear dynamics, aircraft engines, rotor/stator interactions**Description du sujet**:
**Context and objectives**

More stringent environmental constraints and a very competitive global context force manufacturers to face new challenges in order to improve the efficiency of turbomachines, be it in the aerospace sector or for power generation. The impossibility to compromise safety or the environmental footprint of such systems means that in early design stages designers must now understand and account for nonlinear vibration phenomena - such as blade/casing contacts - that are still only partially characterized today. The proposed Ph.D. project is part of a larger research program that aims at developing a numerical strategy for the simulation, the characterization and the consideration of blade/casing contact phenomena within compressor blade design stages using two complementary solution paradigms: in the time domain and in the frequency domain. This research program will give the opportunity to both industrial partners to share their common knowledge and expertise on this topic in order to develop a uniform numerical tool suited both for gas turbines blades and aircraft engine blades.

The proposed research has three main objectives:

- **Hyper reduction techniques for geometrically nonlinear reduced-order models.** The inclusion of geometric nonlinearities in reduced-order models yields a significant computational burden that may lead to weeks of computations for the reduced-order model alone. Hyper reduction techniques offer a promising avenue for reducing computational times.
- **Development of thermo-mechanical mistuned bladed disk models.** The combination of mistuning and contact non-linearities is a very recent field of research. Preliminary results indicate that localization factors tend to be significantly increased in comparison to those simulated in a linear framework. For blades where the vibration energy may be localized, thermo-mechanical effects may become essential to account for.
- **Implementation of a dynamic update of modal reduction bases** for efficient multiphysics nonlinear dynamics simulations.

**Work environment**

**Prise de fonction**:

- 01/09/2025**Nature du financement**:

- Contrat doctoral**Précisions sur le financement**:

- NSERC Alliance project**Présentation établissement et labo d'accueil**:

- École Polytechnique de Montréal**Intitulé du doctorat**:

- Doctorat en génie mécanique**Pays d'obtention du doctorat**:

- Canada**Etablissement délivrant le doctorat**:

- ECOLE POLYTECHNIQUE-
- 31/12/2024

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