Publication of Rédiger sa thèse en sciences : Guide à l'usage des doctorants by Kindle Direct Publishing
Are you unsure how to approach writing your PhD thesis? Are you worried about facing writer's block? Do you lack knowledge of the stylistic and typographic conventions of scientific writing? Don't worry, this book is here to help you.
This small book is designed as a guide that you can consult throughout the writing of your science thesis. It will help you transcribe your scientific methodology. It will allow you to verify the rules, uses, best practices, and recommendations for writing, organizing, and formatting your document. It also complies with the latest 2022 regulatory texts on doctoral studies.
A. Le Bot, J. Bonjour, Rédiger sa thèse en sciences, KDP, ISBN 9798397478717, 2024.
Publication of Introduction aux vibrations aléatoires by Dunod
Random mechanics, particularly the study of random vibrations, is an important field in engineering. Applications are numerous in transportation, aeronautics, aerospace, and energy industries. This book is an up-to-date synthesis of a course given at Ecole Centrale de Lyon, France, at the master's level. It coherently gathers all the material required in structural vibration, signal processing, and probability theory.
This book aims to provide students, researchers, and engineers with all the keys to investigate this fundamental science of engineering.
A. Le Bot, Introduction aux vibrations aléatoires, Dunod, 2018.
Publication of Arts, sciences et autres frictions
L’art, les sciences et la philosophie caractérisent surtout trois manières d’interroger le réel, sans qu’aucune d’elles ne l’épuise. Définies d’abord comme des quêtes personnelles ou collectives, les œuvres artistiques, scientifiques ou philosophiques cristallisent à un moment donné une méthode, une manière ou un style pour explorer la réalité.
Ce livre explore cette quête à travers les théories, les œuvres, les performances, les concepts. Il identifie des zones de frictions et repère les enjeux contemporains à partir des regards croisés de la science, de l’art et de la philosophie. Il propose un parcours sur ce terrain de convergences et de rencontres pour comprendre comment se noue le dialogue entre arts, sciences et philosophie. Il cherche à rendre visible la convergence des regards. Comme sur le schéma, l’artiste, le scientifique ou le philosophe occupent trois points de vue avec trois regards.
I. Antoine, S. Carvallo, A. Le Bot, J. Perret-Liaudet, Arts, sciences et autres frictions, Lycée La Martinière Diderot, Ecole centrale de Lyon, 2016.
Publication of Foundation of Statistical Energy Analysis in Vibroacoustics by Oxford University Press
This book provides an in-depth study of the foundations of statistical energy analysis, with a focus on examining the statistical theory of sound and vibration. In the modal approach, an introduction to random vibration with application to complex systems having a large number of modes is provided. For the wave approach, the phenomena of propagation, group speed, and energy transport are extensively discussed.
Particular emphasis is given to the emergence of the diffuse field, the central concept of the theory. All important notions are gradually introduced—making the text self-contained—to lead the reader to the ultimate result of 'coupling power proportionality' and the concept of 'vibrational temperature'.
Further key topics include the analogy between thermodynamics and sound vibration. Applications are concerned with random vibration in mass-spring resonators, strings, beams, rods, and plates but also reverberation in room acoustics, radiation of sound, and sound response.
A. Le Bot, Foundation of Statistical Energy Analysis in Vibroacoustics, Oxford University Press, May 2015.
The squeal noise of a rubber-glass contact is controlled by Stribeck's law
The origin of the squeal of wiper blades or other rubber joints rubbing against glass surfaces is less obvious than it appears at first sight. We have performed an experiment to systematically explore the domain of squealing and observed that it appears during the transition between the boundary and hydrodynamic regimes. But the origin of the transition remains mysterious...
The ripples in water are induced by the rubber-glass instability.
F. Deleau, D. Mazuyer, A. Koenen, Sliding friction at elastomer/glass contact: Influence of the wetting conditions and instability analysis, Tribology International, vol. 42, 2009.
J. Le Rouzic, A. Le Bot, J. Perret-Liaudet, M. Guibert, A. Rusanov, L. Douminge, F. Bretagnol, D. Mazuyer, Friction-induced vibration by Stribeck's law: application to wiper blade squeal noise, Tribology Letters, vol. 49, p. 563-572, 2013.
The noise induced by the rubbing of rough surfaces is not proportional to the contact area!
We carried out an experiment to check if the friction noise of sliding rough surfaces is proportional to the contact area. We found that no! This result is not intuitive. Naive reasoning would suggest that the more numerous the sliding solids, the higher the noise they emit. Read more...
Experiment to measure friction noise versus contact area.
A. Le Bot and E. Bou Chakra, Measurement of friction noise versus contact area of rough surfaces weakly loaded, Tribology Letters, vol. 37, p. 273-281, 2010.
A. Le Bot, E. Bou Chakra and G. Michon, Dissipation of vibration in rough contact, Tribolgy Letters, vol. 41, p. 47-53, 2011.
V.H. Dang, J. Perret-Liaudet, J. Scheibert, A. Le Bot, Direct numerical simulation of the dynamics of sliding rough surfaces, Computational Mechanics, vol. 52, pages 1169-1183, 2013.
The concept of entropy in statistical vibroacoustics
Up to now, statistical vibroacoustics and its main theory, statistical energy analysis, are entirely based on the application of energy balance. But if the analogy with thermodynamics is often underlined, it is never said what happens with the concept of entropy. We have discussed the second principle of thermodynamics in the framework of statistical energy analysis and introduced the concept of "vibrational entropy" and the "vibrational temperature" of sub-systems.
In steady-state condition, we have shown that the entropy exchanged with the exterior by sources and dissipation exactly balances the production of entropy by irreversible processes at interfaces between sub-systems. Read more...
Statistical energy analysis for complex structures. Sub-systems behave like tanks for vibrational energy but also vibrational entropy. The first principle states the exchanges of vibrational energy between sub-systems and the second principle the exchanges of vibrational entropy.
A. Le Bot, Entropy in statistical energy analysis, Journal of the Acoustical Society of America, vol. 125, p. 1473-1478, 2009.
A. Le Bot, A. Carcaterra, D. Mazuyer, Statistical vibroacoustics and entropy concept, Entropy, vol. 12, p. 2418-2435, 2010.
Statistical energy analysis is not a high frequency method!
It is usually claimed that statistical energy analysis (SEA) is a high frequency theory of vibroacoustics. To check this assertion, we have applied dimensional analysis to rectangular plates and have identified four dimensionless numbers for the validity of SEA: The mode count N, the modal overlap M, the normalized attenuation factor m, and the coupling strength.
Numerical experiments performed by solving the governing equations by the 'brute force' confirm that the validity domain of SEA in the frequency-damping loss factor plane is a narrow strip whose upper limit decreases with frequency. An increase of frequency with a constant damping loss factor may lead to getting out of the validity domain! Read more...
Left, Validity domain of SEA in the frequency-damping plane (dark zone). Right, At high frequency SEA no longer applies.
A. Le Bot and V. Cotoni, Validity diagrams of statistical energy analysis, Journal of Sound and Vibration, vol. 329, p. 221-235, 2010.
T. Lafont, N. Totaro, A. Le Bot, Review of statistical energy analysis hypotheses in vibroacoustics, Proceedings of the Royal Society A, In Press, 2014.
