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ESR11: Industrial application of periodic structures to aircraft/launchers PhD Position at Ecole Centrale de Lyon (France)
Ecole Centrale de Lyon, Ecully
LTDS
Engineering 
Full Description:

Objectives

EADS D&S and ECL already achieved basic tests of the vibroacoustic signature of parts of the ARIANE5 launcher. Precisely a representative part of the launcher was considered. The configuration which was analyzed is the SYLDA structure. The SYLDA is located inside the launcher fairing and allows for multiple payloads to be simultaneously launched. The SYLDA structure is roughly an assembly of two cones and a cylindrical central part. The employed materials are of sandwich type with a honeycomb aluminium core and carbon/epoxy made face sheets. Several methods were used for predicting broadband vibroacoustic responses such as: finite-element methods (FEM), an hybrid WFEM/FEM approach and Statistical energy analysis (SEA). The main objective of the workplan is to validate a periodic design of the SYLDA component versus the conventional one. This ESR will be devoted to the design of the SYLDA using periodic concepts and considering realistic sources. The design rules will be fixed by AST. The issue of added mass and static constraints will be handled. The periodic ribs configurations as well as periodic viscoelastic patches will be tested. The focus will also be the optimization of considered configurations with respect to industrial constraints. Precisely, the main steps of the ESR work will be the following:
1- Effects of lateral periodic ribs properties on the vibroacoustic response of the SYLDA under aerodynamic excitations. Modelling and optimizations.
2- Effects of circumferential periodic ribs properties on the vibroacoustic response of the SYLDA under aerodynamic excitations. Modelling and optimizations.
3- Effects of periodic viscoelastic patches on the vibroacoustic response of the SYLDA under aerodynamic excitations. Modelling and optimizations.
An experimental demonstrator of a 1/4 scale of the SYLDA structure will be used in the ESR work program. One of the periodic concepts numerically dealt with will thus be tested allowing an experimental validation of the finding. VTC will contribute to both the numerical and experimental parts of the work.

Expected Results: Assessments of periodic design of the SYLDA component performance. Validation of numerical tools and optimization under realistic constraints.



Posted on: 30 May 2016Deadline to apply: 01 October 2016Start Date: 01 November 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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