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ESR4: Vibroacoustics of periodic structures, Multi-layer core topology systems PhD Position at Ecole Centrale de Lyon (France)
Ecole Centrale de Lyon, Ecully
LTDS
Engineering 
Full Description:

Objectives

Reducing the size of vibroacoustic problems involving multi-layered elements is a major issue today. Finite element method (FEM) can be used, leading to large computational costs. Alternatively semi-analytic models based on the waves travelling inside such media exist. In particular the Transfer Matrix Method (TMM) has been intensively used in the last years because of its limited computational cost. However, the assumed hypothesis of flat infinite layers leads sometimes to imprecise results. In particular, it is well known that lateral boundary conditions have an important effect on the frequency response functions for problems involving reduced size section areas. TMM is thus usually considered as a high frequency method. However, this method is often used in the low frequency range. Typically, for the simulation of the sound absorption or transmission through multi-layered panels.

The objective of the work is thus:
1- Extend TMM to multi-layered periodic structures
2- Validation of the TMM results against full numerical computations and assessments of the validity domain.
3- Improvement of TMM for multi-layered construction through the use of the WFE.
4- Optimization of the core characteristics using the updated TMM approach.
Core manufacturing guidelines in terms of global apparent behaviour will be provided. The optimal core characteristics and topology will be of interest at early stage of the manufacturing period.

Expected Results: A semi-analytical approach adapted to periodic structures based on the TMM principle. Improvement of the TMM using WFE results. Use of the reduced resulting formulation for optimization.



Posted on: 30 May 2016Deadline to apply: 01 July 2016Start Date: 01 October 2016 Duration: 36 months
The Fund category is Mixed Funding and the salary is 35-40k€ annual gross
Doctoral School is Doctoral program in physical and engineering sciences in the Rhône-Alpes Region.

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