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Статті в журналах з теми "Surfaces – Texture – Simulation, Méthodes de":
Chui, Ming Wei, You Qian Feng, Wei Wang, Pei Lin Li, and Zheng Chao Li. "Numerical Simulation of Rough Surface with Crossed Texture." Applied Mechanics and Materials 321-324 (June 2013): 196–200. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.196.
Tagawa, Norio, Takefumi Hayashi, and Atsunobu Mori. "Effects of Moving Three-Dimensional Nano-Textured Disk Surfaces on Thin Film Gas Lubrication Characteristics for Flying Head Slider Bearings in Magnetic Disk Storage." Journal of Tribology 123, no. 1 (July 25, 2000): 151–58. http://dx.doi.org/10.1115/1.1326442.
Mao, Yang, and Zhongwei Yin. "Modeling and experiments of cavitation on a pocket-textured surface." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 1 (June 8, 2019): 94–103. http://dx.doi.org/10.1177/1350650119855903.
Söderfjäll, Markus, Roland Larsson, Pär Marklund, and Andreas Almqvist. "Texture-induced effects causing reduction of friction in mixed lubrication for twin land oil control rings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, no. 2 (June 9, 2017): 166–78. http://dx.doi.org/10.1177/1350650117709152.
Gao, Weimin, Lijing Wang, Jolanta K. Coffey, Hongren Wu, and Fugen Daver. "Finite Element Modelling and Experimental Validation of Scratches on Textured Polymer Surfaces." Polymers 13, no. 7 (March 25, 2021): 1022. http://dx.doi.org/10.3390/polym13071022.
Tong, Rui Ting, Geng Liu, and Lan Liu. "Studies on Nanoscale Sliding Contacts of Textured Surfaces by Multiscale Method." Applied Mechanics and Materials 155-156 (February 2012): 883–86. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.883.
Jia, Hekun, Zeyuan Zhou, Bifeng Yin, Huiqin Zhou, and Bo Xu. "Influence of microdimple on lubrication performance of textured plunger pump." Industrial Lubrication and Tribology 73, no. 4 (April 6, 2021): 563–71. http://dx.doi.org/10.1108/ilt-07-2020-0259.
Yang, Xiping, Xin Kuang, Jinghu Ji, and Yonghong Fu. "Research on the influence of laser molten pool flow and evaporation on the bump texture forming of aluminum plate surface." Surface Topography: Metrology and Properties 10, no. 1 (March 1, 2022): 015050. http://dx.doi.org/10.1088/2051-672x/ac5f68.
Brenner, Gunther, Ahmad Al-Zoubi, Merim Mukinovic, Hubert Schwarze, and Stefan Swoboda. "Numerical Simulation of Surface Roughness Effects in Laminar Lubrication Using the Lattice-Boltzmann Method." Journal of Tribology 129, no. 3 (March 15, 2007): 603–10. http://dx.doi.org/10.1115/1.2736452.
Zhang, G. M., and S. G. Kapoor. "Dynamic Generation of Machined Surfaces, Part 2: Construction of Surface Topography." Journal of Engineering for Industry 113, no. 2 (May 1, 1991): 145–53. http://dx.doi.org/10.1115/1.2899671.
Дисертації з теми "Surfaces – Texture – Simulation, Méthodes de":
Mostefaoui, Lotfi. "Eclairage global pour textures et surfaces non homogènes." Limoges, 1999. http://www.theses.fr/1999LIMO0044.
Torres, Guzman Diana Angélica. "Generation and control of tactile feedback with longitudinal ultrasonic vibration and human-in-the-Loop analysis." Thesis, Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUN035.
Haptic technology offers users a unique way of interacting with the virtual world, as it allows direct information transfer between the interfaces and the human through the sense of touch. Surface haptic devices use different techniques to achieve friction modulation in order to simulate texture. In the case of ultrasonic surface haptics, this is achieved with the use of piezoelectric ceramics, which, supplied by a sinusoidal alternating voltage, elicit motion on the surface of the device. This motion is transmitted and amplified by the material, at its resonance frequency.Transversal vibrational modes are commonly used in ultrasonic surface haptic technology. This work evaluates the possibility to use longitudinal vibration as a technological alternative to produce haptic return in ultrasonic devices. Valuable comparisons between transverse and longitudinal modes are performed on a dedicated device, both on the point of view of energetic behavior and stimuli perception quality. The action and perception of the human in this context are very important. Unfortunately, due to the complexity of friction phenomena, the sensory response is different from one user to another, with the same haptic stimulus. For this reason, it is interesting to explore the human in the tactile simulation loop. With this purpose in mind, an initial attempt to develop the concept of "Human-in-the-Loop" in surface haptics is given in this thesis, using the EMR formalism, (Energetic Macroscopic Representation)developed within the L2EP Control team and already commonly applied to HIL (Hardware in the Loop).This PhD thesis is organized as follows: chapter 1 presents the state of the art and the positioning. Chapter 2 presents the creation and control of a longitudinal wave surface haptic device. In Chapter 3, the interaction model at the origin of the friction modulation effect with ultrasonic longitudinal vibration is proposed and validated for the case where the exploration occurs in the same axis as the wave motion, as well as the more general case where the exploration occurs in any other direction. In Chapter 4, a series of experiments are conceived to perform a comparative analysis between longitudinal and transverse ultrasonic vibration, in terms of energetic requirements for a given texture intensity. From this study, it is possible to perceive one important problematic in the design of ultrasonic surface haptic devices: the adaptation of the haptic feedback to each user to achieve a standardized perception. Chapter 5 deals with this problematic, by introducing the concept of acoustic finger force and its correlation with the friction reduction phenomenon. Finally, Chapter 6 presents the lessons learned in the previous chapters in a ‘Human-in-the-loop’ perspective and explores the possible future applications of this type of analysis.This work has been carried out within the framework of the Mint Project at IRCICA. It takes, therefore, part in the collaborative ‘CRIStAL-L2EP-MINT’ team, and CNRS GdR TACT group
Decourselle, Thomas. "Etude et modélisation du comportement des gouttelettes de produits phytosanitaires sur les feuilles de vignes par imagerie ultra-rapide et analyse de texture." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00949360.
Fricout, Gabriel Yrieix. "Propriétés morphologiques et optiques des surfaces rugueuses." Paris, ENMP, 2004. https://pastel.archives-ouvertes.fr/pastel-00001102.
In this PhD, we have focused our interest on studying general aspect of rough surfaces and particularly steel surfaces, that can be coated and designed for any kind of applications. In the following, the words surface aspect have to be understood as general texture characteristics without taking into account local defects. The control of such an aspect during production process is performed by regular sampling of the product and visual comparison with a reference data set. This method does not only forbid a continuous quality control of surface aspect, but also introduces a very subjective part in surfaces appearance evaluation. Firstly, we develop a set of morphological features (based on surface segmentation, tortuosity map, granulometry. . . ) as well as statistical features (covariance curve, slopes histogram. . . ), that leads us to surface characterization. The question of features stability is then considered by means of features variance when a large surface is characterized several times using independent observation windows. Some geostatistical tools enable us to address this problem in some particular cases and bootstrap over-sampling is also introduced with special care to statistical dependence between variables. A statistical method based on different steps of factorial analysis is then introduced in order to chose a representation space that is well suited for bayesian classification. This very generic methodology for analyzing surface texture is then applied to a real problem. We study the automatic classification of surfaces with "orangepeel" aspect according to the quality of their appearance. Once successful experiments were performed in laboratory using interferometric microscopy, we design a vision system based on a collimated source and a matricial camera, so that an automatic and systematic quality control of surface aspect can be set up on production line. In order to improve our classifier performance, the possibility of using flooding trees for texture characterization is considered and we develop an algorithm to divide a flooding tree into subtrees so that bootstrap techniques become usable with such a particular data structure. Finally, the optical behavior of surfaces is modeled by the way of ray casting in order to simulate the image obtained by a camera under specific lighting conditions. Reciprocally, we propose an algorithm to compute a surface topography if only a single camera image is known. All these points join a recent dynamic coming from steel industry in general and Arcelor group in particular, that should lead to a better understanding of esthetic for surfaces, the final aim being the prediction and anticipation of consumer’s desires in this particular field. Considering this, our tools open perspectives for defining the "ideal surface" for a given application
Ben, Messaoud Wael. "Design and control of a tactile stimulator for real texture simulation : application to textile fabrics." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10040/document.
The friction modulation produced by ultrasonic vibrations is one of the methods which produce the tactile stimulation. The vibration amplitude is modulated depending on the finger position to give the illusion of touching a texture. This thesis aims at developing a tactile device able to simulate the sensation of touching complex textures such as textile fabrics. For this aim, we modelled first the vibration behaviour and proposed a new strategy to track the resonance frequency of the tactile device and to improve the robustness of the control. On the other hand, the relationship between the tribological aspects of interaction finger / stimulator and the perception of stimuli is assessed to define the most perceived tribological criteria. The tribological parameter named “friction contrast” is introduced. Following this tribological study, we developed a new tactile device called SmartTac integrating new force sensors to measure and control directly the coefficient of friction and to make it adaptive to the user’s finger. Last, a method for extracting the tribological properties of three various textile fabrics is applied to simulate them. Our method is validated by conducting a psychophysical experiment with a success rate of 78%, matching the simulated surfaces to real surfaces
Julian, Pauline. "Méthodes variationnelles pour la segmentation avec application à la réalité augmentée." Phd thesis, Toulouse, INPT, 2012. http://oatao.univ-toulouse.fr/17822/7/Julian_P.pdf.
Roux, Jean-Christophe. "Méthodes d'approximation et de géométrie algorithmique pour la reconstruction de courbes et surfaces." Phd thesis, Grenoble 1, 1994. http://tel.archives-ouvertes.fr/tel-00344528.
Grosjean, Bénédicte. "Détectabilité des lésions en mammographie numérique : impact de la texture." Châtenay-Malabry, Ecole centrale de Paris, 2007. http://www.theses.fr/2007ECAP1057.
The presence of normal breast structure (texture) in digital mammography images decreases the detection pertormance of radiologists. We propose new tools and methods to study the impact of the presence of breast texture on the detectability of les ions in such images. We develop an image simulation tool which enables to synthesize mammography images with realistic texture appearance. We evaluate the impact of the texture on the scoring of a contrast-detail phantom commonly used in mammography. We show that this flat-field phantom is clinically relevant to assess the detectability of microcalcifications, but not of larger lesions such as masses. We propose a new mathematical observer, based on the recenUy introduced a-contrario framework. With a detection strategy close to th one of radiologists when looking for les ions in real clinical situations, this observer is a relevant alternative to model human visual perception. Extending the a-contrario framework to the case of textured backgrounds, we demonstrate the ability of the a-contrario observer to predict detectability laws in various textures and iparticular in mammography textures. We apply these new tools to the optimization of the acquisition parameters in digital mammography in presence of texture. We show that the current digital mammography systems have reached an optimal usage. Furthermore, we demonstrate that the variability on detection pertormance induced by breast texture can not be overcome by optimizing the acquisition techniques, highlighting the benefit of any breast imaging technology reducing the influence of breast texture
Costa, Maria. "Segmentation de structures anatomiques du bas abdomen à l'aide de surfaces déformables 3D." Paris, ENMP, 2008. http://pastel.archives-ouvertes.fr/pastel-00003832.
The main objective of this thesis is to provide radio--oncology specialists with automatic tools for delineating organs at risk of a patient undergoing a radiotherapy treatment of prostate tumors. In order to achieve this goal, we work with CT Scan images. The images are first put in a common frame of reference by means of locally--affine registration based on the pelvic bone structures. A progressive approach consisting of three stages is then applied: the bladder is first delineated, the prostate is later included, and the rectum segmentation is finally integrated. Given the highly heterogenous nature of the images in our database, our contribution for the segmentation process is centered on emph{flexibility}. The bladder is a highly variable structure, both in terms of shape (fillings, compression by surrounding organs) and of intensity levels, the latter due to inhomogeneities caused by the presence or absence (to various levels) of a contrast agent. We propose a segmentation approach that is able to automatically adapt both to the shape and, most remarkably, to the intensity variability. The prostate shows no distinct "edge" in the image itself; its interface with the bladder is often very difficult (if not impossible) to discern, even for the trained eye of medical experts. We have incorporated anatomical information and taken the intensity similarities into account in our approach to contour this structure. An original non--overlapping constraint optimizes the result in terms of image and shape prior information, in order to avoid ambiguities in the delineation of the common boundaries. Finally, the rectum is incorporated in the segmentation. Different acquisition protocols for the CT scans result in images containing rectums with very different characteristics in terms of shape and intensity (due to filling level and nature, air insufflation, contrast agent, etc. ). A flexible method that makes no assumptions about the interior of the structure has been developped and thoroughly tested. The developments that resulted from this thesis have been incorporated to the Isogray software by DOSIsoft, allowing further validation in clinical conditions
Héliodore, Frédéric. "Simulation bidimensionnelle du transistor à effet de champ AsGa à grille submicronique : application à l'optimisation des composants faible bruit." Lille 1, 1987. http://www.theses.fr/1987LIL10203.
Тези доповідей конференцій з теми "Surfaces – Texture – Simulation, Méthodes de":
Chen, Lingping, Yanchao Zhang, Yahui Cui, and Minghu Yin. "Friction Simulation Analysis of Finger Seal with Different Surfaces Texture." In 2021 International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS). IEEE, 2021. http://dx.doi.org/10.1109/icitbs53129.2021.00203.
Mengoni, Maura, Paolo Morichetti, Margherita Peruzzini, and Michele Germani. "A Method for Roughness and Texture Simulation via Tactile Displays." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48880.
Gru¨ebler, R., and P. Hora. "Simulation of the Tribological System in Sheet Metal Processes on the Micro Scale." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63548.
Weisenberger, Janet M., and Michael J. Krier. "Haptic Perception of Simulated Surface Textures via Vibratory and Force Feedback Displays." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0377.
Zhou, Zhou, and Chung-Lung Chen. "Flooded Two-Phase Flow Dynamics and Heat Transfer With Engineered Wettability on Microstructured Surfaces." In ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/mnhmt2013-22023.
Watson, Cori, Wisher Paudel, Houston G. Wood, and Brian K. Weaver. "Quantifying the Linearity of the Fluid Dynamics for Noncontacting Annular Seals." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66804.
Jocsak, Jeffrey, Yong Li, Tian Tian, and Victor W. Wong. "Analyzing the Effects of Three-Dimensional Cylinder Liner Surface Texture on Ring-Pack Performance With a Focus on Honing Groove Cross-Hatch Angle." In ASME 2005 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/icef2005-1333.
Rashwan, Ola H., and Vesselin Stoilov. "MicroSurface Texturing for a Minimum Coefficient of Friction." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71466.
Neumann, Karoline M., and Sören Ehlers. "Power Spectrum for Surface Description of Corroded Ship Structure From Laser Scan." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95907.