Sarah joined SystemX in November 2013 to begin her thesis on the development of vibro-acoustic optimization criteria for surface structures. She describes her experience in the ROM project (multi-physical model reduction and optimization), under the guidance of Université de Versailles Saint-Quentin-en-Yvelines and Renault.

What is the subject of your thesis?

Several factors must be considered in the design stage of a vehicle, not least the shapes of components. In my thesis, I studied the question of vibro-acoustics. When an engine is running, the components in the automobile vibrate at a certain frequency and so we want to avoid the problem of resonance. To illustrate this think about soldiers who are no longer allowed to march on bridges because the bridges could resonate and thus become deformed. I am dealing with the same problem, transposed into the automobile sector. At the heart of my thesis is the following: what is the best type of shape to give an automobile component, to enable it to function properly?

What do you conclude from your PhD?

I recall three very intense years of work, with very short nights – but above all, many very enriching encounters, thanks to the IRT, where I discovered how an R&D project worked, with academic and industrial input and sharing of highly diverse skills. My PhD was both the best and the worst three years of my studies! (laugh)

Can you describe your best memory of SystemX?

The first edition of Future@SystemX in 2014. This was a brand new event that enabled us to show our research work to the IRT partners for the first time. I also have fond memories of the following day, when all the project teams got together at a Bring and Share lunch.

What are your plans for the future?

First of all, I’m going to take a holiday ! After that, I’d like to continue research in applied mathematics in industry.

More about Sarah Julisson
Thesis: Development of vibro-acoustical optimization criteria for surfacic structures
R&D project: ROM (Multi-physical model reduction and optimization)
Qualification: Holder of a  Master 2 in Applied Mathematics at  Université Pierre et Marie Curie (UPMC)


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