Relevant bibliographies by topics / Thermode de contact

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Thermode de contact'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Thermode de contact.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Thermode de contact"

1

Rasmussen, Vibe Maria, Catarina Ellehuus-Hilmersson, Per Rotbøll-Nielsen, and Mads Utke Werner. "Spatial summation of thermal stimuli assessed by a standardized, randomized, single-blinded technique." Scandinavian Journal of Pain 9, no. 1 (October 1, 2015): 81–86. http://dx.doi.org/10.1016/j.sjpain.2014.12.001.

Full text
Abstract:
AbstractBackground and aimsQuantitative sensory testing of thermal perception (QTT) is a valuable method in clinical and experimental assessment of the function of small nerve fibres. Previous studies have indicated existence of spatial summation for warmth, cool and heat pain stimulation, but study designs and assessment methods have not always been mutually consistent. The aims of this study were, first, to examine spatial summation of QTT by differently sized contact thermodes, and, second, to evaluate if these differences are significant from a clinical and scientific perspective.MethodsSixteen healthy subjects were included. Warmth detection (WDT), cool detection (CDT) and heat pain (HPT) thresholds were assessed in random order, with the stimulation areas of the contact thermodes of 3.0, 6.3 and 12.5 cm2, blinded to the subjects. Assessments were made bilaterally at volar part of the distal arm and medial part of the lower leg. Data analyses were by a mixed model with random effect for subject and fixed-effects for the variables, site (arm/leg), thermode area (ln thermode area) and side (dominant/non-dominant), in addition to conventional pairwise non-parametric comparisons.ResultsData from 2 subjects were excluded. In the remaining 14 subjects only 4 subjects were able to identify the correct sequence of thermode sizes. The model demonstrated highly statistical significant relationships regarding main effects: thermode area (P < 0.0001) and stimulation site (P < 0.0001; except for CDT P = 0.011). The only significant interaction was between thermode area*site (P = 0.005) for CDT. The study demonstrated in 17 of 18 possible comparisons between thermode size and stimulation site, a significant spatial summation for WDT, CDT and HPT.ConclusionThis randomized, single-blind study of thermal thresholds demonstrated spatial summation and that considerable deviations may occur if values obtained with differing thermode sizes are used uncritically.ImplicationsData from the present study enable interpolation of thermal thresholds with differing thermode sizes, facilitating comparisons across studies.
APA, Harvard, Vancouver, ISO, and other styles
2

Vierck, Charles J., Richard L. Cannon, Gentry Fry, William Maixner, and Barry L. Whitsel. "Characteristics of Temporal Summation of Second Pain Sensations Elicited by Brief Contact of Glabrous Skin by a Preheated Thermode." Journal of Neurophysiology 78, no. 2 (August 1, 1997): 992–1002. http://dx.doi.org/10.1152/jn.1997.78.2.992.

Full text
Abstract:
Vierck, Charles J., Jr., Richard L. Cannon, Gentry Fry, William Maixner, and Barry L. Whitsel. Characteristics of temporal summation of second pain sensations elicited by brief contact of glabrous skin by a preheated thermode. J. Neurophysiol. 78: 992–1002, 1997. Temporal summation of sensory intensity was investigated in normal subjects using novel methods of thermal stimulation. A Peltier thermode was heated and then applied in a series of brief (700 ms) contacts to different sites on the glabrous skin of either hand. Repetitive contacts on the thenar or hypothenar eminence, at interstimulus intervals (ISIs) of 3 s, progressively increased the perceived intensity of a thermal sensation that followed each contact at an onset latency >2 s. Temporal summation of these delayed (late) sensations was proportional to thermode temperature over a range of 45–53°C, progressing from a nonpainful level (warmth) to painful sensations that could be rated as very strong after 10 contacts. Short-latency pain sensations rarely were evoked by such stimuli and never attained levels substantially above pain threshold for the sequences and temperatures presented. Temporal summation produced by brief contacts was greater in rate and amount than increases in sensory intensity resulting from repetitive ramping to the same temperature by a thermode in constant contact with the skin. Variation of the interval between contacts revealed a dependence of sensory intensity on interstimulus interval that is similar to physiological demonstrations of windup, where increasing frequencies of spike train activity are evoked from spinal neurons by repetitive activation of unmyelinated nociceptors. However, substantial summation at repetition rates of ≥0.33 Hz was observed for temperatures that produced only late sensations of warmth when presented at frequencies <0.16 Hz. Measurements of subepidermal skin temperature from anesthetized monkeys revealed different time courses for storage and dissipation of heat by the skin than for temporal summation and decay of sensory intensity for the human subjects. For example, negligible heat loss occurred during a 6-s interval between two trials of 10 contacts at 0.33 Hz, but ratings of sensory magnitude decreased from very strong levels of pain to sensations of warmth during the same interval. Evidence that temporal summation of sensory intensity during series of brief contacts relies on central integration, rather than a sensitization of peripheral receptors, was obtained using two approaches. In the first, a moderate degree of temporal summation was observed during alternating stimulation of adjacent but nonoverlapping skin sites at 0.33 Hz. Second, temporal summation was significantly attenuated by prior administration of dextromethorphan, a N-methyl-d-aspartate receptor antagonist.
APA, Harvard, Vancouver, ISO, and other styles
3

Tousignant-Laflamme, Yannick, and Serge Marchand. "Aging Independently of the Hormonal Status Changes Pain Responses in Young Postmenopausal Women." Pain Research and Treatment 2012 (October 3, 2012): 1–7. http://dx.doi.org/10.1155/2012/693912.

Full text
Abstract:
Both aging and hormonal status have an effect on pain perception. The goal of this study was to isolate as much as possible the effect of aging in postmenopausal women. Thirty-two women with regular menstrual cycles (RMW) and 18 postmenopausal women (PMW) underwent a 2-minute cold pressor test (CPT) to activate DNIC with a series of tonic heat pain stimulations with a contact thermode to assess ascending pain pathways. We found that this procedure induced much less pain during the first 15 seconds of stimulation the PMW group (P=0.03), while the mean thermode pain ratings, pain tolerance, pain threshold, and DNIC analgesia were similar for both groups (P>0.05). The absence of the peak pain in the PMW was probably due to reduced function of the myelinated Aδ fibers that naturally occurs with age.
APA, Harvard, Vancouver, ISO, and other styles
4

Mauderli, Andre P., Charles J. Vierck, Richard L. Cannon, Anthony Rodrigues, and Chiayi Shen. "Relationships Between Skin Temperature and Temporal Summation of Heat and Cold Pain." Journal of Neurophysiology 90, no. 1 (July 2003): 100–109. http://dx.doi.org/10.1152/jn.01066.2002.

Full text
Abstract:
Temporal summation of heat pain during repetitive stimulation is dependent on C nociceptor activation of central N-methyl-d-aspartate (NMDA) receptor mechanisms. Moderate temporal summation is produced by sequential triangular ramps of stimulation that control skin temperature between heat pulses but do not elicit distinct first and second pain sensations. Dramatic summation of second pain is produced by repeated contact of the skin with a preheated thermode, but skin temperature between taps is not controlled by this procedure. Therefore relationships between recordings of skin temperature and psychophysical ratings of heat pain were evaluated during series of repeated skin contacts. Surface and subcutaneous recordings of skin temperatures revealed efficient thermoregulatory compensation for heat stimulation at interstimulus intervals (ISIs) ranging from 2 to 8 s. Temporal summation of heat pain was strongly influenced by the ISIs and cannot be explained by small increases in skin temperature between taps or by heat storage throughout a stimulus series. Repetitive brief contact with a precooled thermode was utilized to evaluate whether temporal summation of cold pain occurs, and if so, whether it is influenced by skin temperature. Surface and subcutaneous recordings of skin temperature revealed a sluggish thermoregulatory compensation for repetitive cold stimulation. In contrast to heat stimulation, skin temperature did not recover between cold stimuli throughout ISIs of 3–8 s. Psychophysically, repetitive cold stimulation produced an aching pain sensation that progressed gradually and radiated beyond the site of stimulation. The magnitude of aching pain was well related to skin temperature and thus appeared to be established primarily by peripheral factors.
APA, Harvard, Vancouver, ISO, and other styles
5

Craig, A. D., and D. Andrew. "Responses of Spinothalamic Lamina I Neurons to Repeated Brief Contact Heat Stimulation in the Cat." Journal of Neurophysiology 87, no. 4 (April 1, 2002): 1902–14. http://dx.doi.org/10.1152/jn.00578.2001.

Full text
Abstract:
It was recently shown that repeated heat stimulation, using brief contacts (<1 s) with a preheated thermode at sufficiently short interstimulus intervals (ISIs <5 s) and high temperatures (≥51°C), will elicit in humans a sensation of rapidly augmenting “second” (burning) pain with only a weak “first” (sharp) pain sensation. Most strikingly, at short intertrial intervals (ITIs >5 s) such summation will reset, or begin again at baseline. In the present experiments, the responses of nociceptive lamina I spinothalamic (STT) neurons in the lumbosacral dorsal horn of barbiturate-anesthetized cats were examined using this repeated brief contact heat paradigm. The neurons were classified as nociceptive-specific (NS, n = 8) or polymodal nociceptive (HPC, n = 8) based on their responses to quantitative thermal stimuli; all had receptive fields on the glabrous ventral hindpaw. A pneumatic piston was used to apply a thermode preheated to 34, 46, 49, 53, or 58°C with a contact dwell time of ∼0.7 s to the ventral hindpaw repeatedly (15 times) at ISIs of 2, 3, and 5 s, with 3–5 min between trials. The mean responses of the 16 nociceptive lamina I STT cells showed rapid temporal summation that was directly dependent on temperature and inversely dependent on ISI, with the greatest increases occurring between the 3rd and 10th contacts. The temporal profiles of this family of curves correspond with the psychophysical data on human sensation. Further analysis showed that this summation was due to the HPC cells, which all showed strong summation; in contrast, the NS cells showed little, if any. The HPC responses to the repeated heat stimuli lagged each contact by ∼1 s, consistent with the strong, monosynaptic C-fiber input that is characteristic of HPC cells and also with the dependence of second pain on C-fiber nociceptors. HPC cells also displayed the reset phenomenon at short ITIs, again in correspondence with the psychophysical data. The summation and the reset displayed by HPC cells were not related to skin temperature. Thus the results presented in this study, together with those in the preceding article, demonstrate a double dissociation indicating that NS and HPC lamina I STT cells can subserve the qualitatively distinct sensations of first (sharp) and second (burning) pain, respectively. These findings support the concept that the lamina I STT projection comprises several discrete sensory channels that are integrated in the forebrain to generate distinct sensations.
APA, Harvard, Vancouver, ISO, and other styles
6

Springborg, Anders Deichmann, Caitlin Rae Wessel, Lars Peter Kloster Andersen, and Mads Utke Werner. "Methodology and applicability of the human contact burn injury model: A systematic review." PLOS ONE 16, no. 7 (July 30, 2021): e0254790. http://dx.doi.org/10.1371/journal.pone.0254790.

Full text
Abstract:
The contact burn injury model is an experimental contact thermode-based physiological pain model primarily applied in research of drug efficacy in humans. The employment of the contact burn injury model across studies has been inconsistent regarding essential methodological variables, challenging the validity of the model. This systematic review analyzes methodologies, outcomes, and research applications of the contact burn injury model. Based on these results, we propose an improved contact burn injury testing paradigm. A literature search was conducted (15-JUL-2020) using PubMed, EMBASE, Web of Science, and Google Scholar. Sixty-four studies were included. The contact burn injury model induced consistent levels of primary and secondary hyperalgesia. However, the analyses revealed variations in the methodology of the contact burn injury heating paradigm and the post-burn application of test stimuli. The contact burn injury model had limited testing sensitivity in demonstrating analgesic efficacy. There was a weak correlation between experimental and clinical pain intensity variables. The data analysis was limited by the methodological heterogenicity of the different studies and a high risk of bias across the studies. In conclusion, although the contact burn injury model provides robust hyperalgesia, it has limited efficacy in testing analgesic drug response. Recommendations for future use of the model are being provided, but further research is needed to improve the sensitivity of the contact burn injury method. The protocol for this review has been published in PROSPERO (ID: CRD42019133734).
APA, Harvard, Vancouver, ISO, and other styles
7

Micus, Sebastian, Ivan Kirsten, Michael Haupt, and Götz T. Gresser. "Analysis of Hot Bar Soldering, Insulation Displacement Connections (IDC), and Anisotropic Conductive Adhesives (ACA), for the Automated Production of Smart Textiles." Sensors 20, no. 1 (December 18, 2019): 5. http://dx.doi.org/10.3390/s20010005.

Full text
Abstract:
Despite all the growth forecasts of the smart textiles market, there is no stable automated manufacturing process for attaching classic electronics to textiles. The great amount of manual production steps causes high prices, which slow down market growth. During the production process, the contacting step offers the greatest potential to reduce manual manufacturing steps. For this reason, we have analyzed various contacting methods for electronic parts on conductive yarns that have a high potential for automation. The chosen methods were thermode soldering, insulation–displacement connectors and anisotropic conductive adhesives. In order to ensure reliable mechanical contacting, the samples were tested in a peeling experiment. The examination of the contact resistances took place in the context of a resistance test using four-wire measuring technology.
APA, Harvard, Vancouver, ISO, and other styles
8

Ruscheweyh, Ruth, Frederike Stumpenhorst, Stefan Knecht, and Martin Marziniak. "Comparison of the Cold Pressor Test and Contact Thermode-Delivered Cold Stimuli for the Assessment of Cold Pain Sensitivity." Journal of Pain 11, no. 8 (August 2010): 728–36. http://dx.doi.org/10.1016/j.jpain.2009.10.016.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Moulton, E. A., M. L. Keaser, R. P. Gullapalli, and J. D. Greenspan. "Regional Intensive and Temporal Patterns of Functional MRI Activation Distinguishing Noxious and Innocuous Contact Heat." Journal of Neurophysiology 93, no. 4 (April 2005): 2183–93. http://dx.doi.org/10.1152/jn.01025.2004.

Full text
Abstract:
Cortical responses to painful and nonpainful heat were measured using functional magnetic resonance imaging (fMRI) region of interest analysis (ROI) of primary somatosensory cortex (S1), secondary somatosensory cortex (S2), anterior cingulate (ACC), supplementary motor area (SMA), insula, and inferior frontal gyrus (IFG). Previous studies indicated that innocuous and noxious stimuli of different modalities produce responses with different time courses in S1 and S2. The aim of this study was to 1) determine whether temporally distinct nociceptive blood oxygen level–dependent (BOLD) responses are evoked in multiple somatosensory processing cortical areas and 2) whether these responses discriminate small noxious stimulus intensity differences. Thirty-three subjects underwent fMRI scanning while receiving three intensities of thermal stimuli, ranging from innocuous warm (41°C) to 1°C below tolerance, applied to the dorsum of the left foot. Innocuous and noxious responses were distinguishable in contralateral S1, the mid-ACC, and SMA. The peak of the nociceptive response was temporally delayed from the innocuous response peak by 6–8 s. Responses to noxious but not to innocuous stimuli were observed in contralateral posterior insula. Responses to innocuous and noxious stimuli were not statistically different in contralateral S2. In contralateral S1 only, the nociceptive response could differentiate heat stimuli separated by 1°C. These results show that 1) multiple cortical areas have temporally distinguishable innocuous and noxious responses evoked by a painfully hot thermode, 2) the nociceptive processing properties vary across cortical regions, and 3) nociceptive responses in S1 discriminate between painful temperatures at a level unmatched in other cortical areas.
APA, Harvard, Vancouver, ISO, and other styles
10

Knezevic, Aleksandar, Milena Kovacevic, Ljiljana Klicov, Magdalena Pantic, Jana Vasin, and Tijana Spasojevic. "Conditioned pain modulation assessment using contact heat as conditioning stimulus and two different test stimuli." Medical review 72, no. 3-4 (2019): 66–71. http://dx.doi.org/10.2298/mpns1904066k:.

Full text
Abstract:
Introduction. The objective of the study was to determine the potentials and reliability of conditioned pain modulation effect in healthy population by application of a conditioning contact heat stimulus, and heat and pressure applied to the low back region as a test stimulus. Material and Methods. The study included 33 healthy subjects (average age 25.73 ? 5.35 years). Pressure and heat pain thresholds were examined on the paravertebral musculature of the lower back as test stimuli. Contact heat was used on the contralateral forearm as a conditioning stimulus. Conditioned pain modulation was calculated as the difference between pain thresholds after and before conditioning stimulus application. To assess the reliability, identical testing was performed 14 ? 2 days later. Results. The pressure and heat pain thresholds, after the conditioning stimulus, were significantly higher compared to pain thresholds obtained before the conditioning stimulus (101,63 N/cm2 ? 45,21N/cm2 vs 82,15 N/cm2 ? 36,15 N/cm2, t = -7,528, p < 0,001 and 47,08?C ? 2,19o C vs 45,00 ? 3,05?C, t = -6,644, p < 0,001, respectively). The reli?ability of the same protocol, measured 14 ? 2 days after the previous testing, showed good reliability of the pressure pain threshold (intraclass correlation coefficient = 0,636, 95% confidence interval 0,240 - 0,825), and fair of the heat pain threshold (intraclass cor?relation coefficient = 0,435, 95% confidence interval - 0,070 - 0,713). Conclusion. Conditioned pain modulation was successfully induced by contact heat applied via a thermode, a conditioning stimulus. The reliability of this method of testing proved to be fair when it comes to the heat pain threshold and good when it comes to the pressure pain threshold.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Thermode de contact"

1

Geyn, Sergey. "FEM-BEM procedures for elastoplastic thermo-viscoplastic contact problems." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984384472.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Mishra, Prakash Chandra. "Transient thermo elastohydrodynamics of piston compression ring-cylinder liner contact." Thesis, Loughborough University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547397.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Kadiric, Amir. "Thermo-mechanical analysis of layered rough surface contacts." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413501.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Benaceur, Amina. "Réduction de modèles en thermo-mécanique." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1140/document.

Full text
Abstract:
Cette thèse propose trois nouveaux développements de la méthode des bases réduites (RB) et de la méthode d'interpolation empirique (EIM) pour des problèmes non-linéaires. La première contribution est une nouvelle méthodologie, la méthode progressive RB-EIM (PREIM) dont l'objectif est de réduire le coût de la phase de construction du modèle réduit tout en maintenant une bonne approximation RB finale. L'idée est d'enrichir progressivement l'approximation EIM et l'espace RB, contrairement à l'approche standard où leurs constructions sont disjointes. La deuxième contribution concerne la RB pour les inéquations variationnelles avec contraintes non-linéaires. Nous proposons une combinaison RB-EIM pour traiter la contrainte. En outre, nous construisons une base réduite pour les multiplicateurs de Lagrange via un algorithme hiérarchique qui conserve la positivité des vecteurs cette base. Nous appliquons cette stratégie aux problèmes de contact élastique sans frottement pour les maillages non-coïncidents. La troisième contribution concerne la réduction de modèles avec assimilation de données. Une méthode dédiée a été introduite dans la littérature pour combiner un modèle numérique avec des mesures expérimentales. Nous élargissons son cadre d'application aux problèmes instationnaires en exploitant la méthode POD-greedy afin de construire des espaces réduits pour tout le transitoire temporel. Enfin, nous proposons un nouvel algorithme qui produit des espaces réduits plus représentatifs de la solution recherchée tout en minimisant le nombre de mesures nécessaires pour le problème réduit final
This thesis introduces three new developments of the reduced basis method (RB) and the empirical interpolation method (EIM) for nonlinear problems. The first contribution is a new methodology, the Progressive RB-EIM (PREIM) which aims at reducing the cost of the phase during which the reduced model is constructed without compromising the accuracy of the final RB approximation. The idea is to gradually enrich the EIM approximation and the RB space, in contrast to the standard approach where both constructions are separate. The second contribution is related to the RB for variational inequalities with nonlinear constraints. We employ an RB-EIM combination to treat the nonlinear constraint. Also, we build a reduced basis for the Lagrange multipliers via a hierarchical algorithm that preserves the non-negativity of the basis vectors. We apply this strategy to elastic frictionless contact for non-matching meshes. Finally, the third contribution focuses on model reduction with data assimilation. A dedicated method has been introduced in the literature so as to combine numerical models with experimental measurements. We extend the method to a time-dependent framework using a POD-greedy algorithm in order to build accurate reduced spaces for all the time steps. Besides, we devise a new algorithm that produces better reduced spaces while minimizing the number of measurements required for the final reduced problem
APA, Harvard, Vancouver, ISO, and other styles
5

Hadji-Ristic, Daniel Ilan. "Thermo-electric and transport properties of etched quantum point contacts." Thesis, Royal Holloway, University of London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444164.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Pantuso, Daniel. "A finite element procedure for the analysis of thermo-mechanical solids in contact." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10441.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Srirattayawong, Sutthinan. "CFD study of surface roughness effects on the thermo-elastohydrodynamic lubrication line contact problem." Thesis, University of Leicester, 2014. http://hdl.handle.net/2381/29057.

Full text
Abstract:
This research investigates the effect of surface roughness on Thermo- Elastohydrodynamic Lubrication (TEHL) by Computational Fluid Dynamics (CFD). Traditionally, the Reynolds equation has been used to describe the flow of a lubricant for the TEHL problem, but this approach has some limitations. To overcome these, CFD is used in this research, as an alternative to solving the Reynolds equation. The commercial software packages ANSYS ICEM CFD 13.0 and ANSYS FLUENT 13.0 are employed to solve the Navier-Stokes equations. User-defined functions (UDFs) for the heat generated in the lubricant film, the density and the viscosity of lubricant, and the elastic deformation of the cylindrical roller bearing are created for this particular research. For viscosity, the lubricant is modelled as a non-Newtonian fluid based on the Ree-Eyring model. A number of CFD models are created under different conditions to predict the flow characteristics in the TEHL line contact problem, including the pressure distribution, the temperature distribution, the film thickness, and the friction coefficient. The effect of surface roughness is considered in the CFD models. The predicted results from the CFD models and the Reynolds equation are compared. The pressure distribution and the film thickness of both models are found to be in agreement. The simulation results show that the surface roughness affects significantly for the behaviour of fluid film lubrication problems, especially in the thin film case. It is found that the pressure profile at the centre of the contact area directly relates to the roughness amplitude. Furthermore, the CFD models can model the elastic deformation of cylinders of different materials, which is another advantage of the CFD approach over the Reynolds equation.
APA, Harvard, Vancouver, ISO, and other styles
8

Nikas, Georgios. "Theoretical modelling of the entrainment and thermomechanical effects of contamination particles in elastohydrodynamic contacts." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314006.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Bausseron, Thomas. "Etude de l’échauffement de la caténaire lors du captage à l’arrêt : Développement d’un outil informatique." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2062/document.

Full text
Abstract:
Dans le domaine ferroviaire de nombreux incidents ont montré le problème de l'échauffement de la caténaire au droit du contact avec le pantographe durant le captage de courant à l'arrêt. L'échauffement à l'interface pantographe/caténaire peut entraîner la rupture du fil de contact de la caténaire. Le travail présenté dans cette étude, issu de la collaboration entre la SNCF et l'institut FEMTO-ST, vise à améliorer la compréhension des phénomènes physiques mis en jeu. L'objectif à terme est d'anticiper une maintenance coûteuse comme le remplacement du fil de contact. Un modèle électrothermique 2D transitoire du fil de contact a été développé et couplé à un modèle thermique 1D transitoire pour obtenir une modélisation quasi 3D. La modélisation, alimentée par des données expérimentales, permet de déterminer la répartition du courant électrique et donc la production de chaleur interne. Une modélisation électrothermique de la bande vient compléter le système
In the railroad and trains domain, many incidents show the main problem of overheating of the catenary at the contact with the pantograph when the train was stopped whereas all the electrical systems of the train should nevertheless be fed. Analysis of these incidents has shown that the overheating of the interface catenary-pantograph during the ream conditioning was sometimes at the origin of the break of the contact wire. In order to forecast such very expensive problems for the company, the French National Railway Company (SNCF) and the research institute FEMTO-ST carried out theoretical and experimental studies to better understand this phenomenon. First a quasi 3D transient electrothermal modeling tool has been developed for the contact wire. It has also permitted to estimate the distribution of current in the wire in order to obtain the internal heat power generation. An electrothermal modelisation of the strip complete the system. Finally the heat transfer equation in the wire with particular boundary conditions has been solved in all the finite differences network thanks to the Euler's implicit method
APA, Harvard, Vancouver, ISO, and other styles
10

Doyen, Franck. "Comportement tribologique du contact sec arbre acier - paliers carbonés avec butées soumis à des sollicitations thermo-vibratoires sévères." Poitiers, 2006. http://www.theses.fr/2006POIT2344.

Full text
Abstract:
La tribologie des contacts secs soumis à des déplacements relatifs de faible amplitude et les matériaux de frottement sont des thématiques régulièrement traitées. Cependant, les études y faisant référence simultanément sont très rares. Ce manuscrit a pour but d’améliorer la compréhension des phénomènes physiques et du comportement tribologique inhérents aux contacts secs arbre / palier lisse avec butée soumis à des sollicitations thermo-vibratoires. Le mécanisme industriel à l’initiative de cette étude a été analysé afin d’identifier son principe et ses conditions de fonctionnement. Un diagnostic sur ses pertes de fonctionnalités, le lien existant entre ses disfonctionnements et le contact étudié, ainsi qu’une expertise morphologique de ses éléments de guidage ont été effectués. Un dispositif expérimental original a été conçu et réalisé afin de reproduire au mieux les conditions de contact réelles des éléments de guidage étudiés (notion de triplet tribologique). Les différents éléments qui le composent et les démarches suivies pour valider ses fonctionnalités sont exposés. Il en ressort des résultats expérimentaux significatifs sur l’usure, les phénomènes physiques qui y sont liés et la capacité à accommoder les vitesses des différents couples de matériaux étudiés. L’apport d’un modèle numérique 3D intégrant la notion de mésalignement a été détaillé et analysé. Une synthèse scientifique discutant l’influence de la taille de grains pour les graphites, de la nature et de l’orientation des composites, mais aussi de l’origine des phénomènes physiques identifiés (migration des éléments imprégnés, présence de formes rectangulaires dans les zones de contact) est effectuée
The tribology of the dry contacts subjected to relative displacements of low amplitude and the friction materials are themes which are regularly treated in the literature. However, the studies referring simultaneously of both are very rare. The purpose of this manuscript is to improve comprehension of the physical phenomena and the tribological behavior inherent to the dry contacts “shaft / bearing with thrust” subjected to a thermo-vibratory environment. The industrial mechanism on the origin of this study was analyzed in order to identify its principle and these operating conditions. A diagnosis on its losses of functionalities, the link between its disfonctionnements and the studied contact, and a morphological expertise of its guidance elements were performed. A new experimental test rig was designed and realized in order to reproduce the real contact conditions of the studied guidance elements (concept of “tribological triplet”). Its various elements and the steps followed to validate its functionalities are exposed. Thanks it, for the various studied material couples, significant experimental results on their wear (and its physical phenomena) and their capacity of velocity accommodation are obtained. The contribution of a 3D numerical model integrating a misalignment for a cylinder in cylinder contact was detailed and analyzed. A scientific synthesis discussing the influence of the size of graphites grains, the nature and the orientation of composites, but also the origin of the identified physical phenomena (the migration of the impregnated elements, the presence of rectangular forms in the contact zones) is carried out
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Thermode de contact"

1

United States. National Aeronautics and Space Administration., ed. Application of Russian thermo-electric devices (TEDS) for the U.S. microgravity program protein crystal growth (PCG) project: Final report, for contract NAS8-38609 ... [Washington, DC: National Aeronautics and Space Administration, 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

United States. National Aeronautics and Space Administration., ed. Application of Russian thermo-electric devices (TEDS) for the U.S. microgravity program protein crystal growth (PCG) project: Final report, for contract NAS8-38609 ... [Washington, DC: National Aeronautics and Space Administration, 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Fiber finishes for improving interfacial thermo-oxidative stability in PMR-II-50 matrix composites: Final report for the period of October 1993 through September 1996, contract NAS3-27090. [Washington, DC: National Aeronautics and Space Administration, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

E, Allred Ronald, and United States. National Aeronautics and Space Administration., eds. Fiber finishes for improving interfacial thermo-oxidative stability in PMR-II-50 matrix composites: Final report for the period of October 1993 through September 1996, contract NAS3-27090. [Washington, DC: National Aeronautics and Space Administration, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Jet Propulsion Laboratory (U.S.), ed. Final technical progress report for the development of advanced thermoelectric materials: 1 October 1975 to 31 January 1984, contract number 954349 ; prepared for Jet Propulsion Laboratory ; prepared by Thermo Electron Corporation. [Pasadena, Calif.]: The Laboratory, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Thermode de contact"

1

Wriggers, Peter. "Thermo-mechanical Contact." In Computational Contact Mechanics, 365–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-32609-0_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Chen, W. Wayne. "Thermo-Elasto-Plastic Contact." In Encyclopedia of Tribology, 3650–55. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_550.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Nielsen, C. V., W. Zhang, L. M. Alves, N. Bay, and P. A. F. Martins. "Contact Modeling." In Modeling of Thermo-Electro-Mechanical Manufacturing Processes, 37–49. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4643-8_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Litewka, Przemysław. "Thermo-mechanical Coupling." In Finite Element Analysis of Beam-to-Beam Contact, 121–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12940-7_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Nielsen, C. V., W. Zhang, L. M. Alves, N. Bay, and P. A. F. Martins. "Material, Friction and Contact Characterization." In Modeling of Thermo-Electro-Mechanical Manufacturing Processes, 79–87. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4643-8_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Chen, W. Wayne. "Thermo-Elastic Contact of Rough Surfaces." In Encyclopedia of Tribology, 3636–41. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_551.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Boso, Daniela P., Przemyslaw Litewka, and Bernhard A. Schrefler. "Thermo-Mechanical Coupling in Beam-to-Beam Contact." In Recent Developments and Innovative Applications in Computational Mechanics, 9–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17484-1_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Tikhonova, Z., D. Kraynev, and E. Frolov. "Thermo-Emf as Method for Testing Properties of Replaceable Contact Pairs." In Lecture Notes in Mechanical Engineering, 1097–105. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22063-1_117.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Prasad, Dhaneshwar, and S. V. Subrahmanyam. "Thermo Hydrodynamic Lubrication Characteristics of Power Law Fluids in Rolling/Sliding Line Contact." In Lecture Notes in Mechanical Engineering, 127–41. New Delhi: Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1656-8_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Eck, Christof, and Jiří Jarušek. "Solvability of Thermo-Viscoelastic Contact Problems with Coulomb Friction and Nonlinear Heat Conductivity." In Solid Mechanics and Its Applications, 301–8. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-1154-8_32.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Thermode de contact"

1

Nyqvist, J., A. Kadiric, R. Sayles, and S. Ioannides. "Roughness Effects in Thermo-Mechanically Loaded Contacts." In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71246.

Full text
Abstract:
A recently developed thermo-mechanical model was used to investigate the influence of surface roughness characteristics on the maximum contact temperature rise as well as shear stresses in rough surface contacts subjected to normal and tangential loading. In order to identify prevailing trends clearly the surfaces were modelled as having idealised sinusoidal roughness. Following a brief description of the numerical model, results are presented to illustrate the dependence of contact temperature and stresses on roughness parameters such as wavelength and amplitude as well as the contact Peclet number. An attempt is made to explain the observed trends in terms of variation in predicted pressure distribution and real contact areas for different surfaces.
APA, Harvard, Vancouver, ISO, and other styles
2

Baranowski, P., K. Damziak, J. Malachowski, L. Mazurkiewicz, M. Kastek, T. Piatkowski, and H. Polakowski. "Experimental and numerical tests of thermo-mechanical processes occurring on brake pad lining surfaces." In CONTACT AND SURFACE 2011. Southampton, UK: WIT Press, 2011. http://dx.doi.org/10.2495/secm110021.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Nyssen, Florence, Thibaut Vadcard, Elsa Piollet, and Alain Batailly. "Strongly Coupled Thermo-Mechanical Casing/Abradable Model for Rotor/Stator Interactions." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91447.

Full text
Abstract:
Abstract Modern turbomachine designs feature reduced nominal clearances between rotating bladed-disks and their surrounding casings in order to improve the engine efficiency. Unavoidably, clearance reduction increases the risk of contacts between static and rotating components which may yield hazardous interaction phenomena. In this context, the deposition of an abradable coating along the casing inner surface is a common way to enhance operational safety while mitigating interaction phenomena thus allowing for tighter clearances. Nonetheless, interactions leading to unexpected wear removal phenomena between a bladed-disk and a casing with abradable coating have been observed experimentally. Beside of blade damages such as cracks resulting from high amplitudes of vibration, experimental observations included very significant temperatures increase, particularly within the abradable coating, to a point that thermo-mechanical effects may not be neglected anymore. The aim of this work is to investigate the numerical modeling of thermal effects in the abradable coating and the casing due to contact interactions. In particular, the proposed model provides insight on the sensitivity of engines to contact events when the plane had reduced tarmac times between two consecutive flights. A strongly coupled thermo-mechanical model of the casing and its abradable coating is first described. A 3D cylindrical mesh is employed, it may be decomposed in two parts: (1) along the casing contact surface, a cylindrical thermal mesh is constructed to compute the temperature elevation and heat diffusion in the three directions of space within the abradable coating, and (2) the casing itself is represented by a simplified cylindrical thermo-mechanical mesh to compute both temperature elevation and the induced deformations following temperature changes. This 3D hybrid mesh is combined with a mechanical mesh of the abradable layer, dedicated to wear modeling and the computation of normal and tangential contact forces following blade/abradable coating impacts. The heat flux resulting from contact events is related to the friction forces and only heat transfer by conduction is considered in this work. In order to reduce computational times, the time integration procedure is twofold: the explicit time integration scheme featuring reduced time steps required for contact treatment is combined with a larger time step time integration scheme used for the casing thermo-mechanical model. An extensive validation procedure is carried out from a numerical standpoint, it underlines the convergence of the model with respect to time and space parameters.
APA, Harvard, Vancouver, ISO, and other styles
4

Kywe, W. W., M. Yoshida, and K. Murakami. "Contact Lens Extraction by Using Thermo-Vision." In 18th International Conference on Pattern Recognition (ICPR'06). IEEE, 2006. http://dx.doi.org/10.1109/icpr.2006.406.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

De la Cruz, Miguel, Stephanos Theodossiades, Homer Rahnejat, and Patrick Kelly. "The Effect of Thermo-Hydrodynamics on Manual Automotive Transmissions Gear Rattle." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87226.

Full text
Abstract:
Manual transmission gear rattle is the result of repetitive impacts of gear meshing teeth within their backlash. This NVH phenomenon is a major industrial concern and can occur under various loaded or unloaded conditions. It fundamentally differs from other transient NVH phenomena, such as clonk or thud, which are due to impulsive actions. However, they all have their lowest common denominator in the action of contact/impact forces through lubricated contacts. Various forms of rattle have, therefore, been defined: idle rattle, drive rattle, creep rattle and over-run rattle. This paper presents a dynamic transmission model for creep rattle conditions (engaged gear at low engine RPM). The model takes into account the lubricated impact force between a gear teeth pair during a meshing cycle as well as the friction between their flanks. Hertzian contact conditions are applied to the gear pair along the torque path. Additionally, isoviscous hydrodynamic regime of lubrication is assumed for unselected (loose gear pairs) with lightly loaded impact conditions. The highly non-linear impacts induce a range of system response frequencies. These include engine order harmonics, harmonics of meshing frequency and natural frequencies related to contact stiffness. The last of these are dependent on the contact geometry and lubricant rheology. The analysis includes lubricant viscosity variation due to generated contact pressures as well as temperature. For loose gears, subject to oscillations on their retaining bearings, bearing friction is also considered.
APA, Harvard, Vancouver, ISO, and other styles
6

Mutzel, Timo, Duancheng Ma, Franz Roters, and Dierk Raabe. "Thermo-mechanical stresses within switching contact systems after arcing events." In 2017 IEEE Holm Conference on Electrical Contacts. IEEE, 2017. http://dx.doi.org/10.1109/holm.2017.8088077.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Jackson, Robert L., and Erika R. Crandall. "A Multiphysics Coupled Electro-thermo-mechanical Model of Whisker Shorting." In 2018 IEEE Holm Conference on Electrical Contacts. IEEE, 2018. http://dx.doi.org/10.1109/holm.2018.8611780.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Nyssen, Florence, and Alain Batailly. "Thermo-Mechanical Modeling of Abradable Coating Wear in Aircraft Engines." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75824.

Full text
Abstract:
In modern turbomachine designs, the nominal clearances between rotating bladed-disks and their surrounding casing are reduced to improve aerodynamic performances of the engine. This clearance reduction increases the risk of contacts between components and may lead to hazardous interaction phenomena. A common technical solution to mitigate such interactions consists in the deposition of an abradable coating along the casing inner surface. This enhances the engine efficiency while ensuring operational safety. However, contact interactions between blade-tips and an abradable layer may yield unexpected wear removal phenomena. The aim of this work is to investigate the numerical modeling of thermal effects within the abradable layer during contact interactions and compare it with experimental data. A dedicated thermal finite element mesh is employed. At each time step, a weak thermo-mechanical coupling is assumed: thermal effects affect the mechanics of the system, but the mechanical deformation of the elements has no effect on temperatures. Weak coupling is well appropriated in the case of rapid dynamics using small time step and explicit resolution schemes. Moreover, only heat transfer by conduction is considered in this work. To reduce computational times, a coarser spatial discretization is used for the thermal mesh comparing to the mechanical one. The time step used to compute the temperature evolution is larger than the one used for the mechanical iterations since the time constant of thermal effect is larger than contact events. The proposed numerical modeling strategy is applied on an industrial blade to analyze the impact of thermal effects on the blade’s dynamics.
APA, Harvard, Vancouver, ISO, and other styles
9

Kadiric, A., R. S. Sayles, and E. Ioannides. "Thermo-Mechanical Effects in Layered Rough Surface Contacts." In STLE/ASME 2006 International Joint Tribology Conference. ASME, 2006. http://dx.doi.org/10.1115/ijtc2006-12335.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Lee, Sungae, and Chang-Dong Yeo. "Thermo-Mechanical Contact and Micro-Wear in Head Disk Interface." In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61059.

Full text
Abstract:
Thermo-mechanical contact and micro-wear of head disk interface (HDI) are investigated using the improved HDI contact model and theories of frictional heat generation and heat transfer. In analytical simulations, dynamic contact parameters such as material properties, sliding velocity, and surface interference are based on actual HDI design and operation. The resulting contact pressure and temperature distribution show that the micro-wear on the carbon film of a head slider would be significantly attributed to the degradation of carbon material caused by frictional heat generation during sliding contact.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Thermode de contact' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography