Vivien DENIS
Associate Professor, INSA CVL, LaMé, Blois, France
I have a degree in Mechanical Engineering (INSA Lyon, GMC, 2011) and a PhD in Acoustics (Université du Maine, LAUM, 2014). Since 2017, I work as an associate professor (maître de conférence) in INSA Centre Val de Loire (Blois). My research activities are done within the Laboratoire de Mécanique Gabriel LaMé (LaMé).
About Me
I ride bikes for fun and transport. In my free time I play music: I played the clarinet in various wind bands, marching bands and jazz ensemble. I also play the irish flute and the uilleann pipes with friends. Sometimes I 3D-print instruments. I also like to grow trees, fruits and vegetables.
Research Interests
During my PhD, I worked under the supervision of Pr. François Gautier and Dr. Adrien Pelat on the Acoustic Black Hole (ABH) effect. The main idea behind it is the use of a gradient of both bending stiffness and damping properties in the aim of localizing and efficiently damp the flexural waves in thin structures (beams and plates). This constitutes an interesting way to damp structural vibrations. Since this ABH effect locally increases the vibration amplitude, I then worked as a postdoc and studied geometrical nonlinearities taking place in plates of variable thickness, under the supervision of Pr. Cyril Touzé. During my second postdoc, which was supervised by Pr. Olivier Thomas, I worked on identifying nonlinearities, specifically backbone curves, using a Phase-Locked Loop.
Nowadays, within the team Dynamique et Vibrations des Structures (DVS) of the LaMé, I work with Pr. Jean-Mathieu Mencik on topics including wave propagation, defect identification in structural waveguides and model order reduction. I also work with Pr. Roger Serra on fault detection in structures and vibration fatigue. I had or have the pleasure to co-supervise the PhD theses of Diego Salam Claro, Anurag Dubey, Luca Campello and Pouloumde Nikiema.
Teaching Activities
I teach at INSA CVL, Blois, in the Industrial systems engineering (GSI) and Sciences and Techniques for Engineers (STPI) departments. I give lectures and tutorials in Structural Vibrations and Vibroacoustics. I also supervise practical works in Computed Aided Drawing, Machining and Fluid Mechanics.
Selected publications
- Prediction of flow induced sound and vibration of periodically stiffened plates, L. Maxit, V. Denis, J. Acoust. Soc. Am. 133 (1), 146-160 (2013).
- Modal Overlap Factor of a Beam with an Acoustic Black Hole termination, V. Denis, A. Pelat, F. Gautier, B. Elie, J. Sound Vib. 333, 2475-2488 (2014).
- Vibration damping in beams using the Acoustic Black Hole effect, V. Denis, PhD thesis, Université du Maine, 2014.
- Measurement and modelling of the reflection coefficient of an Acoustic Black Hole termination, V. Denis, F. Gautier, A. Pelat, J. Poittevin, J. Sound Vib. 349, 67-79 (2015).
- Scattering effects induced by imperfections on an Acoustic Black Hole placed at a structural waveguide termination, V. Denis, A. Pelat, F. Gautier, J. Sound Vib. 362, 56-71 (2016).
- Improvement of the acoustic black hole effect by using energy transfer due to geometric nonlinearity, V. Denis, A. Pelat, C. Touzé, F. Gautier, Int. J. of Nonlinear Mech.,94, 134-145 (2017).
- Identification of nonlinear modes using phase-locked-loop experimental continuation and normal form, V. Denis, M. Jossic, C. Giraud-Audine, B. Chomette, A. Renault, O. Thomas, Mech. Syst. Signal Process. 106, 430-452 (2018).
- A wave-based optimization approach of curved joints for improved defect detection in waveguide assemblies, V. Denis, J.-M. Mencik, J. Sound Vib. 465, 115003 (2020).
- A Novel VBSHM Strategy to Identify Geometrical Damage Properties Using Only Frequency Changes and Damage Library, A. Dubey, V. Denis, R. Serra, Applied Sciences 10 (23), 8717 (2020).
- Vibrations non-linéaires géométriques de plaque mince rectangulaire d'épaisseur variable, V. Denis, 15ème Colloque National en Calcul des Structures (CSMA 2022), Giens, Mai 2022.
- Sensitivity and Efficiency of the Frequency Shift Coefficient Based on the Damage Identification Algorithm: Modeling Uncertainty on Natural Frequencies, A. Dubey, V. Denis, R. Serra, Vibrations 5 (1), 59-79 (2022).
- Defect localization in waveguide assemblies with curved joints via wave finite elements and time of flight analysis, D. Salam Claro, V. Denis, J.-M. Mencik, European Journal of Mechanics - A/Solids 97, 104814 (2022).
- Geometrically nonlinear vibrations of plate embedding a large circular acoustic black hole, V. Denis, Internoise 2024, Nantes, Août 2024.