Author
Alain Le Bot
Other affiliations: Centre national de la recherche scientifique
Bio: Alain Le Bot is an academic researcher from École centrale de Lyon. The author has contributed to research in topics: Statistical energy analysis & Vibration. The author has an hindex of 10, co-authored 31 publications receiving 243 citations. Previous affiliations of Alain Le Bot include Centre national de la recherche scientifique.
Papers
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TL;DR: In this article, the authors measured the dependence of friction noise versus the nominal contact area, and found that the vibration energy is proportional to the contact area and does not depend on contact area.
Abstract: This study presents an experiment to measure the dependence of friction noise versus the nominal contact area The friction-induced vibration is generated by the sliding of two rough surfaces The normal load is low leading to a weak contact The normal load and the sliding velocity are maintained constant The nominal contact area ranges over two orders of magnitude It is found that two regimes exist On the one hand, the vibration energy is proportional to the contact area But on the second hand, the vibration energy is constant, ie, does not depend on the contact area
47 citations
TL;DR: In this article, the second principle of thermodynamics is discussed in the framework of statistical energy analysis (SEA), and it is shown that the vibrational entropy and the temperature of sub-systems only depend on vibrational energy and the number of resonant modes.
Abstract: In this paper, the second principle of thermodynamics is discussed in the framework of statistical energy analysis (SEA). It is shown that the “vibrational entropy” and the “vibrational temperature” of sub-systems only depend on the vibrational energy and the number of resonant modes. A SEA system can be described as a thermodynamic system slightly out of equilibrium. In steady-state condition, the entropy exchanged with exterior by sources and dissipation exactly balances the production of entropy by irreversible processes at interface between SEA sub-systems.
25 citations
TL;DR: In this paper, the effect of the incidence angle and force ratio on the effective wear of impacts on ferrite steel and stainless steel samples was analyzed and an erosive wear model was introduced.
21 citations
TL;DR: In this article, the radiative transfer method is applied to acoustical diffraction by obstacles, where fictitious sources are introduced at diffracting wedges and a transfer equation based on energy balance determines the diffracted powers.
Abstract: This paper aims to apply the radiative transfer method to acoustical diffraction by obstacles. Some fictitious sources are introduced at diffracting wedges and a transfer equation based on energy balance determines the diffracted powers. It leads to a set of linear equations on diffracted powers which can be solved in a finite number of steps. It is then possible to calculate the diffracted field anywhere. Some applications to diffraction by obstacles of various shapes are presented. Results of this method are compared with Geometrical Theory of Diffraction and BEM reference calculations. It is shown that this method is particularly efficient in case of multiple diffraction where the ray-tracing technique involves an infinite number of rays between a source and a receiver point.
21 citations
TL;DR: Wear generated by repetitive impacts between an Inconel tube sample and a stainless steel flat bar target is studied through experiments in dry environment in this article, where the impact wear energy coefficient is introduced and an impact wear law with a strong mechanical meaning is proposed.
21 citations
Cited by
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29 Oct 2003
TL;DR: In this article, a segment-to-segment contact approach based on the mortar method was proposed to solve the overconstraint problem of locking due to over-constraints and provided smooth force variations in large sliding.
Abstract: Contact modeling is still one of the most difficult aspects of nonlinear implicit structural analysis. Most 3D contact algorithms employed today use node-on-segment approaches for contacting dissimilar meshes. Two pass node-on-segment contact approaches have the well known deficiency of locking due to over constraint. Furthermore, node-on-segment approaches suffer when individual nodes slide out of contact at contact surface boundaries or when contacting nodes slide from facet to facet. This causes jumps in the contact forces due to the discrete nature of the constraint enforcement and difficulties in convergence for implicit solution techniques. In a previous work, we developed a segment-to-segment contact approach based on the mortar method that was applicable to large deformation mechanics. The approach proved extremely robust since it eliminated the overconstraint which caused ''locking'' and provided smooth force variations in large sliding. Here, we extend this previous approach in to treat frictional contact problems. The proposed approach is then applied to several challenging frictional contact problems which demonstrate its effectiveness.
194 citations
Book•
01 Jan 1999
TL;DR: In this article, the authors present a collection of reports written by about 35 internationally recognized authorities, covering a range of interests for geotechnical engineers, including fundamentals for mechanics of granular materials, continuum theory, and discrete element approaches.
Abstract: This textbook compiles reports written by about 35 internationally recognized authorities, and covers a range of interests for geotechnical engineers. Topics include: fundamentals for mechanics of granular materials; continuum theory of granular materials; and discrete element approaches.
113 citations
TL;DR: In this article, the research status of fretting damage in key equipment and structures of nuclear power plant is reviewed, and the authors have solved many problems, accumulated a lot of experience, and put forward many criteria.
78 citations
TL;DR: In this article, the validity domain of statistical energy analysis (SEA) is defined in terms of four criteria: mode count N and the modal overlap M must be high, the normalized attenuation factor m ¯ and the coupling strength γ must be small.
77 citations