Relevant bibliographies by topics / Couplage fort vibrationnel

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  1. Dissertations / Theses
  2. Conference papers

Academic literature on the topic 'Couplage fort vibrationnel'

Author: Grafiati
Published: 20 July 2024
Last updated: 3 May 2025

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Dissertations / Theses on the topic "Couplage fort vibrationnel"

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Muller, Cyprien. "Supramolecular catalysis and vibrational strong coupling : how to influence chemical reactivity ?" Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF014.

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Comment peut-on influencer la réactivité chimique ? Dans ce travail de thèse, j’ai tâché de répondre à cette question en explorant la frontière entre la chimie et la physique. Dans un premier temps, en tirant avantage du solvant 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) qui permet souvent une réactivité exotique, qui peut être attribuée à ses exceptionnelles propriétés physiques. Ces dernières font de HFIP une véritable matrice supramoléculaire, qui nous a permis le développement d’une nouvelle méthode pour la synthèse d’isochromanes fonctionnalisés. Ce faisant, une généralité et une simplicité
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Piejko, Maciej. "Chemistry between mirrors : the influence of Vibrational Strong Coupling (VSC) on selected chemical properties." Electronic Thesis or Diss., Strasbourg, 2025. http://www.theses.fr/2025STRAF007.

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Cette thèse explore les effets du Couplage Fort Vibrationnel (VSC) sur la polarité des solvants, les forces de dispersion de London et l’auto-diffusion de l’eau. L’étude utilisant le colorant solvatochromique de Reichardt suggérait une diminution de la polarité des solvants sous VSC. Cependant, des analyses ultérieures ont révélé que les artefacts optiques, dus à un traitement incorrect des spectres UV/vis et à la réflectivité, étaient responsables des observations, ce qui a conduit à la rétractation de l’article publié. Cette expérience a inspiré l’étude des forces de dispersion de London. Gr
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Wu, Hailong. "Modelization and control of synchronous reluctance machines for the torque ripple minimization - study of vibrational and acoustic behavior." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCA003.

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Cette thèse porte sur l’optimisation du contrôle des Machines Synchrones à Réluctance Variable (MSRV) et en particulier sur la compensation des phénomènes vibratoires. Elle comprend trois points forts : le développement d’une méthode de minimisation des pulsations de couple et sa validation expérimentale, l’études des facteurs qui peuvent influencer la méthode et l’influence de cette méthode sur les autres performances de la MSRV.Tout d’abord, une méthode de contrôle permettant de compenser les ondulations de couple d’une MSRV existante a été développée. Premièrement, une équation analytique d
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Conference papers on the topic "Couplage fort vibrationnel"

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Pratt, David W. "Methyl rotors in large molecules: probes of intramolecular vibrational relaxation and electronic structure." In OSA Annual Meeting. Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fg2.

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A methyl (CH3) group that is attached to a large molecule by a covalent bond adopts a preferred conformation with respect to nearby bonds and exhibits large-amplitude torsional motion. Both the preferred conformations and torsional motions are influenced by the local electronic environment. Additionally, the low-frequency torsional modes may couple to other molecular vibrational modes, providing a mechanism for intramolecular vibrational energy redistribution (IVR).
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SUMAN, Siddharth. "Numerical investigation, modelling and vibrational dynamics of an unbalanced rigid rotor with two offset discs levitated by air foil bearings." In Mechanical Engineering for Sustainable Development. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903438-29.

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Abstract. High speed rotating machines are very useful in several industries and production plants or factories. The rotating components in these machines are usually prone to multiple types of faults. These faults can cause large and heavy amount of vibrations in the assembled rotor systems during its operation. So, there is a need for analyzing the rotor behavior in the presence of faults and their identification. This paper discusses the dynamic behavior of a rigid rotor with two discs at offset positions and mounted on air foil bearings at the ends. In this system, it is assumed that the d
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Hohl, Andreas, Christian Siewert, Lars Panning, and Andreas Kayser. "Nonlinear Vibration Analysis of Gas Turbine Bladings With Shroud Coupling." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50787.

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Rotating blades are subjected to vibrations caused by excitation forces due to a non-homogeneous pressure field of the fluid. Therefore, damping devices like tip shrouds are implemented which reduce the vibrational amplitude and apply additional stiffness and damping to the structure. To predict the resulting vibration response and stresses, a three dimensional contact model has been developed to determine the friction forces. The resulting equations of motion are solved in the frequency domain. The developed method has been implemented in a nonlinear forced response code called DATAR designed
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Motriuk, Roman W., Timothy Schmidt, John Webster, and Thangavel Thevar. "Determination of Dynamic Velocity and Strain Using Wide Field Holographic Interferometry: Verification." In 2000 3rd International Pipeline Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/ipc2000-276.

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High power and high capacity turbo-compressor systems frequently sustain acoustically induced vibrations. Higher order acoustic modes generated by turbo-compressors often couple selectively with structural pipe resonances producing significant increase in pipe wall vibration. In some instances, these coincidences generate high local stress levels that fatigue pipe shell or pipe attachments. In order to judge the level of dynamic strain and stress in piping systems, elaborate theories are employed. However, these are frequently not practical and relatively difficult to use in industrial applica
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Diambu, Alif Ngimbi, and Mehmet Çevik. "Finite Element Vibration Analysis of a Functionally Graded Plate." In International Students Science Congress. Izmir International Guest Student Association, 2021. http://dx.doi.org/10.52460/issc.2021.043.

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Functionally Graded (FG) materials are recent types of engineering materials Fdeveloped as a solution for applications where a couple of relevant properties of different materials are desired in a single continuous composite structure. In these materials, properties are patterned in a way to insure a gradient and continuous property transition direction-wise. This study is a contribution in the literature among other studies but provides an additional understanding of FG Plate structures vibrational behavior in terms of natural frequencies and modal shapes. For this end, an FG plate is modeliz
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Pemberton, Jeanne E. "Surface Raman Scattering as a Probe of Metal Surface Chemistry." In Laser Applications to Chemical Analysis. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/laca.1992.thb1.

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Raman scattering is an attractive probe of surface and interfacial chemistry at metals due to the high degree of molecular specificity inherent in the results. One aspect of Raman scattering that enhances its utility for the study of metal surfaces is the ability to deduce orientational information about molecules at these metal surfaces from the presence of oriented electric fields at these surfaces with which selective vibrational modes can couple. These "surface selection rules" have been both theoretically described and experimentally validated for a variety of metal surfaces. Given the we
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Pop, Eric. "Electron-Phonon Interaction and Joule Heating in Nanostructures." In ASME 2008 3rd Energy Nanotechnology International Conference collocated with the Heat Transfer, Fluids Engineering, and Energy Sustainability Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/enic2008-53050.

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The electron-phonon energy dissipation bottleneck is examined in silicon and carbon nanoscale devices. Monte Carlo simulations of Joule heating are used to investigate the spectrum of phonon emission in bulk and strained silicon. The generated phonon distributions are highly non-uniform in energy and momentum, although they can be approximately grouped into one third acoustic (AC) and two thirds optical phonons (OP) at high electric fields. The phonon dissipation is markedly different in strained silicon at low electric fields, where certain relaxation mechanisms are blocked by scattering sele
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D’Souza, Kiran, and Meng-Hsuan Tien. "Bilinear Amplitude and Frequency Approximation for Nonlinear Systems With Gaps or Prestress." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59062.

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Analysis of the dynamics of bilinear systems is critical for a variety of civil, mechanical and aerospace structures that contain gaps or prestress that are caused by cracks, delamination, joints or interfaces amongst components. Recently, a method was developed called bilinear amplitude approximation (BAA) to estimate the response of bilinear systems without gaps or prestress. This method was developed on the idea that the bilinear system can be separated into two time intervals both of which the system behaves as a distinct linear system: (1) the open state and (2) the closed or sliding stat
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Reich, Alton J., Steve J. Doherty, and Keith A. Williams. "Load Reduction on Valve Position Indicators in High Vibration Environments." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71118.

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The Arnold Engineering Development Center (AEDC) testing complex includes more than 50 wind tunnels, test cells, arc heaters, and other specialized test facilities. Of these, 27 units have capabilities that are unmatched in the United States, and 14 are unmatched in the world. These unique facilities create equally unique operating environments for instrumentation used for monitoring and control of test conditions. Several high flow-rate, supersonic wind tunnels utilize off-the-shelf angular displacement transducers (ADTs) for monitoring the position of 90° valves (i.e. butterfly valves) used
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Maroldt, Niklas, and Joerg R. Seume. "Aeroelastic Influence of Blade-Shaft Coupling in a 1 1/2-Stage Axial Compressor." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-124275.

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Abstract During the design process of turbomachinery, it is often not possible to use aerodynamically optimal designs due to aeroelastic constraints. The design choices are limited by possible structural failure, which can be caused by high vibration amplitudes, for example due to self-excited vibrations (flutter) or forced response. In particular, the modal damping has an important impact on these phenomena. In the absence of frictional contacts, damping is mainly created by aerodynamics. In this paper, the influence of additional damping created by the rotor bearing on the total damping and
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