Relevant bibliographies by topics / Trajectory deformation

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

Academic literature on the topic 'Trajectory deformation'

Author: Grafiati
Published: 19 October 2022

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Journal articles on the topic "Trajectory deformation"

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Fraichard, Thierry, and Vivien Delsart. "Navigating Dynamic Environments with Trajectory Deformation." Journal of Computing and Information Technology 17, no. 1 (2009): 27. http://dx.doi.org/10.2498/cit.1001157.

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Gubanova, Alexandra A. "Investigation of stationary trajectories with associated milling by spur gears." MATEC Web of Conferences 226 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201822602004.

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When milling in a steady state, unlike, for example, turning, there are periodic elastic deformation displacements of the tool relative to the workpiece along the machining path. Instead of an equilibrium point, we consider a certain closed trajectory of elastic deformations. This is the trajectory to which all the trajectories approach asymptotically, while forces and deformations that mutually affect each other through the mechanism of changing the area of the cut-off layer are redistributed. The article proposes a mathematical apparatus and algorithms for calculating the trajectory of establishing a stationary state. The case of milling with spur mills is considered. A mathematical description of the “basic” dynamic model of the associated milling by the side teeth of the end mills for the complete non-stationary nonlinear connection formed by the milling process is presented. It differs from known models by considering spatial oscillations, taking into account the dependence of forces on the cutting speeds, taking into account the rates of elastic deformation displacements, taking into account the retardation of forces with respect to deformation displacements, and also by nonlinear damping caused by forces acting on the trailing edge of the tool. In addition, periodic changes in the parameters and the formation of the surface at the previous contact of the tooth are taken into account.
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Mei, Jiangping, Fan Zhang, Jiawei Zang, Yanqin Zhao, and Han Yan. "Trajectory optimization of the 6-degrees-of-freedom high-speed parallel robot based on B-spline curve." Science Progress 103, no. 1 (October 10, 2019): 003685041988011. http://dx.doi.org/10.1177/0036850419880115.

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According to the problem that the existing high-speed parallel robot cannot satisfy the operation requirements of non-planar industrial production line, a 6-degrees-of-freedom high-speed parallel robot is proposed to carry out the kinematic and dynamic analyses. Combining with the door-type trajectory commonly used by the parallel robot, it adopts 3-, 5-, and 7-time B-spline curve motion law to conduct the trajectory planning in operation space. Taking the average cumulative effect of joint jerky as the optimization target, a trajectory optimization method is proposed to improve the smoothness of robot end-effector motion with the selected motion law. Furthermore, to solve the deformation problem of the horizontal motion stage of the trajectory, a mapping model between the control point subset of B-spline and the motion point subset of trajectory is established. Based on the main diagonally dominant characteristic of the coefficient matrix, the trajectory deformation evaluation index is constructed to optimize the smoothness and minimum deformation of the robot motion trajectory. Finally, compared to without the optimization, the maximum robot joint jerk decreases by 69.4% and 72.3%, respectively, and the maximum torque decreases by 51.4% and 38.9%, respectively, under a suitable trajectory deformation.
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Ario, Takahiro, and Ikuo Mizuuchi. "Planning the Shortest Carrying Trajectory Including Path and Attitude Change Considering Gripping Constraints." Journal of Robotics and Mechatronics 34, no. 3 (June 20, 2022): 607–14. http://dx.doi.org/10.20965/jrm.2022.p0607.

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Carrying gripped objects at high speed can lead to gripping failure owing to loads applied to the gripper by its acceleration. When carrying an object at high speed, it is important to carry it with accelerations at which gripping is maintained. Previously proposed methods generated the shortest carrying trajectory for a predetermined trajectory path. In this study, focusing on the object-carrying trajectory and the hand attitude of the gripper, we propose a method to generate the shortest carrying trajectory by varying the state quantities. The proposed method considers the gripping force and the deformation of the gripper. During planning, we estimated the deformation volume of the gripper from its inputs and generated the shortest carrying trajectory with the allowable force and deformation values as constraints. Using the proposed method, we generated a trajectory capable of carrying objects in a shorter time (0.28 times) than in a straight-line trajectory and conducted experiments with a robot arm. The trajectory was generated while keeping the hand attitude unchanged. Through experiments, we have proved the effectiveness of keeping objects gripped on the generated shortest carrying trajectory. Compared with a success ratio of 0.47 in keeping objects gripped on the trajectory with the same time as the generated trajectory, the success ratio on the generated trajectory is as high as 1.0.
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Young Sung Ghim and John H. Seinfeld. "Trajectory models and the deformation of air parcels." Atmospheric Environment (1967) 22, no. 1 (January 1988): 25–29. http://dx.doi.org/10.1016/0004-6981(88)90296-x.

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Piras, Paolo, Valerio Varano, Maxime Louis, Antonio Profico, Stanley Durrleman, Benjamin Charlier, Franco Milicchio, and Luciano Teresi. "Transporting Deformations of Face Emotions in the Shape Spaces: A Comparison of Different Approaches." Journal of Mathematical Imaging and Vision 63, no. 7 (May 18, 2021): 875–93. http://dx.doi.org/10.1007/s10851-021-01030-6.

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AbstractStudying the changes of shape is a common concern in many scientific fields. We address here two problems: (1) quantifying the deformation between two given shapes and (2) transporting this deformation to morph a third shape. These operations can be done with or without point correspondence, depending on the availability of a surface matching algorithm, and on the type of mathematical procedure adopted. In computer vision, the re-targeting of emotions mapped on faces is a common application. We contrast here four different methods used for transporting the deformation toward a target once it was estimated upon the matching of two shapes. These methods come from very different fields such as computational anatomy, computer vision and biology. We used the large diffeomorphic deformation metric mapping and thin plate spline, in order to estimate deformations in a deformational trajectory of a human face experiencing different emotions. Then we use naive transport (NT), linear shift (LS), direct transport (DT) and fanning scheme (FS) to transport the estimated deformations toward four alien faces constituted by 240 homologous points and identifying a triangulation structure of 416 triangles. We used both local and global criteria for evaluating the performance of the 4 methods, e.g., the maintenance of the original deformation. We found DT, LS and FS very effective in recovering the original deformation while NT fails under several aspects in transporting the shape change. As the best method may differ depending on the application, we recommend carefully testing different methods in order to choose the best one for any specific application.
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Li, Huifang, and Dariusz Ceglarek. "Optimal Trajectory Planning For Material Handling of Compliant Sheet Metal Parts." Journal of Mechanical Design 124, no. 2 (May 16, 2002): 213–22. http://dx.doi.org/10.1115/1.1463035.

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One of the most critical issues in the material handling of compliant objects is excessive part deformation. The deformation of compliant sheet metal parts during the handling process can significantly impact both part dimensional quality and production rate. Increasing production rate while maintaining part quality requires an optimal design of the part transfer trajectory. This paper describes a new methodology of time-optimal trajectory planning for compliant parts by discretizing the part transfer path into N segments that have equal horizontal distance and by approximating the trajectory as having piecewise constant acceleration that can only change its value at the end of each segment. The contribution of the methodology is that part deformation determined by transfer velocity and acceleration is considered as a nonlinear constraint, which is obtained from FEA simulation and model fitting. Part permanent deformation, trajectory smoothness, and static obstacle avoidance are also considered. The methodology is validated by simulations at different motion conditions and obstacle configurations. This paper addresses the lack of current design guidelines for material handing development and simultaneously provides a mathematical tool to significantly enhance the production efficiency in manufacturing of compliant sheet metal parts.
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Pham, Quang-Cuong, and Yoshihiko Nakamura. "A New Trajectory Deformation Algorithm Based on Affine Transformations." IEEE Transactions on Robotics 31, no. 4 (August 2015): 1054–63. http://dx.doi.org/10.1109/tro.2015.2450413.

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Grozav, Sorin Dumitru, Vasile Adrian Ceclan, Antoniu Turcu, and Ovidiu Vasile Oprea. "Kinematic Process Plastic Cold Orbital Forming." Applied Mechanics and Materials 808 (November 2015): 98–103. http://dx.doi.org/10.4028/www.scientific.net/amm.808.98.

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In the paper before you, the authors study the kinematics of the orbital deformation process on the base of the trajectory equation of the mobile element of the machine. Also, the authors show that the trajectory is a closed cycle curve with a finite number of lobes. Relations and charts are presented for the calculation of the number of lobes and their width depending on the machine setting. The upper mold half trajectory choice (active tool) to match the best part deformed kinematics requires detailed knowledge of orbital plastic deformation process, something which develops in the present paper.
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Shin, J., T. W. Cornelius, S. Labat, F. Lauraux, M. I. Richard, G. Richter, N. P. Blanchard, D. S. Gianola, and O. Thomas. "In situ Bragg coherent X-ray diffraction during tensile testing of an individual Au nanowire." Journal of Applied Crystallography 51, no. 3 (May 18, 2018): 781–88. http://dx.doi.org/10.1107/s1600576718004910.

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Systematic tensile tests were performed on single defect-free 〈110〉 Au nanowires grown by physical vapor deposition while simultaneously recording three-dimensional Bragg peaks using coherent X-rays. The trajectory of three-dimensional Bragg peaks in reciprocal space during tensile testing allowed for measurements of the evolution of strains and rotations of the nanowire, thus sensitively uncovering the full deformation geometry of the nanowire. The transition from elastic to plastic deformation is accompanied by rotations of the nanowire as quantified by analysis of the motion of Bragg peaks, showing the importance of boundary conditions in interpreting nanoscale mechanical deformations.
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Dissertations / Theses on the topic "Trajectory deformation"

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Sobrero, Franco Sebastian. "Logarithmic and Exponential Transients in GNSS Trajectory Models as Indicators of Dominant Processes in Post-Seismic Deformation." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu153174766741719.

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Delsart, Vivien. "Navigation autonome en environnement dynamique : Une approche par déformation de trajectoire." Grenoble, 2010. https://theses.hal.science/tel-00592259.

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Cette thèse aborde le problème de navigation d'un système robotique en environnement dynamique et incertain. Plus particulièrement, elle s'intéresse à la détermination du mouvement pour un robot, permettant de rejoindre une position donnée tout en assurant sa propre sécurité et celle des différents agents qui l'entourent. Entre approches délibératives - consistant à déterminer à priori un mouvement complet vers le but - et approches réactives - calculant au cours de la navigation un mouvement à suivre à chaque instant - ont émergé les approches de déformation de mouvement, combinant à la fois une planification de mouvement globale avec un évitement d'obstacles réactif local. Leur principe est simple : un chemin complet jusqu'au but est calculé à priori et fourni au système robotique. Au cours de l'exécution, la partie du mouvement restant être exécutée est déformée continuellement en réponse aux informations sur l'environnement récupérées par les capteurs. Le système peut ainsi modifier son parcours en fonction du déplacement d'obstacles ou de l'imprécision et l'incomplétude de sa connaissance de l'environnement. La plupart des approches de déformations existantes se contentaient de modifier uniquement le chemin géométrique suivi par le robot. Nous proposons alors d'étendre les travaux précédents à une déformation de trajectoire modifiant le mouvement suivi à la fois dans l'espace et dans le temps. Pour ce faire, nous proposons de raisonner sur le futur en utilisant une estimation du comportement futur des obstacles mobiles. En éloignant la trajectoire suivie par le robot du modèle prévisionnel du comportement des obstacles, il est ainsi possible d'anticiper leur mouvement. La trajectoire déformée étant modifiée arbitrairement dans l'espace et dans le temps, l'une des principales difficultés de cette approche consiste à maintenir le respect des contraintes sur le mouvement du robot le long de cette trajectoire et sa convergence vers le but. Une approche de génération de trajectoire avec contrainte sur le temps final a été développée dans ce but. En discrétisant la trajectoire déformée en une séquence d'états-temps successifs, le générateur de trajectoires permet de vérifier si un mouvement faisable existe entre chaque triplé d'états-temps de la trajectoire déformée, et dans le cas contraire de la modifier localement afin de restaurer sa faisabilité. Les approches de déformation et de génération de trajectoire proposées ont été illustrées en simulation puis quelques expérimentations ont été réalisées sur une chaise roulante automatisée
This thesis presents a navigation method in uncertain and dynamic en- vironment. More precisely, it consists in determining the motion of a robot from an initial position to a goal one, while preventing the robot to collide with the other agents evolving in its environment. Between deliberative approaches - consisting in determining a priori a complete motion to the goal - and reactive approaches - computing a new motion to execute at each time step during the robot navigation - have arisen the motion deformation approaches, combining a motion planning method with a reactive obstacle avoidance process. Their principle is simple : A priori complete motion is planned up to the goal and provided to the robotic system. During the course of the execution, the remaining part of the motion to execute is continually deformed in response to information provided by the sensors. The robot is consequently able to adapt its motion to the behaviour of the moving obstacles or to the incompleteness of its environment knowledge. Most of the existing motion deformation methods only deform the geometric path followed by the robot. We propose thus to extend the previous approaches to a trajectory deformation approach that modify the followed motion either in space or time. To do it, trajectory deformation reason on an estimation of the future motion of the obstacles. By preventing the trajectory followed by the robot to collide with a forecast model of the future motion of the obstacles, the robotic system may anticipate their motion. As the deformed trajectory is arbitrarily modified in time and space, one of the major difficulties of the approach is to keep the motion constraints of the robot satisfied along the trajectory. In that aim, a trajectory generation approach with a final time constraint has thus been developed. By discretizing the deformed trajectory in a sequence of state-times, the trajectory generation process allows to check if a feasible motion exists between each triplet of successive state-times, and should the opposite case occur they are modified to restore the connectivity of the deformed trajectory. The trajectory deformation and trajectory generation with final time constraints have been illustrated by simulation results, and a few experiments have been proceeded on an automated wheelchair
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Mikaelian, David. "Etude de la dynamique et de la morphologie de bulles confinées et non confinées, et de leur transfert de matière vers le liquide environnant." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209213.

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Cette thèse porte sur l'étude de la dynamique et de la morphologie de bulles non confinées dans des colonnes à bulles et de bulles confinées dans des microcanaux, ainsi que sur l'étude du transfert de matière entre une bulle sphérique confinée dans un microcanal et le liquide environnant.

Un dispositif expérimental d'imagerie et une méthode de posttraitement des images brutes ont été développés afin d'analyser la dynamique et la morphologie de bulles non confinées ayant une trajectoire non rectiligne de leur centre de masse en évitant les effets de perspectives et en déterminant un seuil pour la binarisation des images brutes sur base d'un critère bien défini. Ce dispositif expérimental et cette méthode de posttraitement des images brutes ont permis de générer des données relatives à la dynamique et la morphologie de bulles ellipsoïdales isolées et non confinées, pour des nombres d'Eötvös (Eo) et de Morton (Mo) de ces bulles tels que 0.8 < Eo < 8 et 10 -11 < Mo < 10 -7. L'analyse de ces données a permis de cartographier la nature de la trajectoire d'une bulle et la présence d'une éventuelle oscillation de son interface en fonction de ses nombres d'Eötvös et de Morton. Les bulles ayant une trajectoire hélicoïdale sans oscillation de leur interface ont été sélectionnées afin de proposer des corrélations pour calculer l'amplitude et la fréquence de leur trajectoire en fonction de leurs nombres d'Eötvös et de Morton. Concernant les bulles ayant une trajectoire en zigzag ou hélicoïdale sans oscillation de leur interface, l'analyse des données a permis de montrer l'alignement entre le vecteur vitesse de leur centre de masse et leur petit axe. Les rayons de courbure de l'avant et l'arrière de l'interface de ces bulles ont été évalués. Pour les bulles ayant une trajectoire en zigzag, une corrélation a été établie pour calculer le rapport des rayons de courbure à l'avant et à l'arrière de leur interface en fonction de leurs nombres d'Eötvös et de Morton. Une pulsation dans la composante verticale du mouvement du centre de masse d'une bulle a été observée dans le cas d'une trajectoire en zigzag de la bulle et ce à une fréquence égale au double de celle de sa trajectoire. Une telle pulsation n'a pas pu être identifiée dans le cas d'une trajectoire hélicoïdale d'une bulle.

Concernant l'analyse de la dynamique de bulles sphériques confinées dans des microcanaux de sections carrée et circulaire, ainsi que du transfert de matière entre ces bulles et le liquide environnant, une méthode numérique a été développée dans laquelle deux conditons aux limites sont considérées sur l'interface liquide-gaz: une condition de contrainte tangentielle nulle et une condition de non glissement. Les résultats obtenus avec cette méthode ont permis de caractériser les champs de vitesse et de concentration autour des bulles considérées, et de montrer leurs interactions. Grâce à ces résultats, des corrélations ont été établies, dans ces microcanaux et pour ces deux conditions aux limites, pour calculer la vitesse des bulles et pour caractériser le transfert de matière entre ces bulles et le liquide en fonction des paramètres définissant le système. Sur base de ces corrélations et de bilans de matière et de quantité de mouvement, un modèle pour la dissolution de bulles le long de microcanaux de sections carrée et circulaire a été proposé, pour le régime bubbly flow, et comparé avec des données expérimentales disponibles dans la littérature. Ce modèle permet de prédire, pour une bulle se mouvant le long d'un microcanal de section carrée ou circulaire, les évolutions des pressions dans le liquide et le gaz, de son diamètre, de sa vitesse, de la concentration du gaz dissous dans le liquide, de la distance de séparation entre cette bulle et la bulle qui la suit et du coefficient de transfert de matière entre cette bulle et le liquide environnant.


Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished

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SEO, TAE-IL. "Integration des effets de deformation d'outil en generation de trajectoire d'usinage." Nantes, 1998. http://www.theses.fr/1998NANT2062.

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Notre etude porte sur l'elaboration d'une methode de generation de trajectoires d'usinage en fraisage qui integre les effets de deformation d'outils. A partir d'une base de donnees outil-matiere, nous determinons les parametres du modele de calcul d'efforts de coupe. L'algorithme de compensation propose permet l'obtention de la trajectoire souhaitee sans reduction de la productivite (conservation des memes conditions de coupe). Il s'appuie sur une modelisation de l'outil de type resistance des materiaux. La notion de diametre equivalent est introduite pour prendre en compte la morphologie de l'outil. La compensation a apporter est calculee, de maniere iterative, par la methode du miroir. Des applications, en simulation et experimentales, sont presentees. Nous nous attachons ensuite aux problemes lies au choix de la reference de compensation en prenant comme critere le tolerancement de la piece. Nous simulons la surface obtenue par une methode integrant la notion de point de contact outil-piece et nous proposons une trajectoire compensee qui assure le respect de la tolerance. Dans le cas ou cette compensation n'est pas possible plusieurs solutions sont proposees : optimisation des conditions de coupe, optimisation des strategies d'usinage. Finalement nous presentons des applications de notre methode. Une comparaison experimentale-simulation est effectuee sur differentes formes de pieces et un cas industriel est traite.
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Bonnefis, Paul. "Etude des instabilités de sillage, de forme et de trajectoire de bulles par une approche de stabilité linéaire globale." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0070/document.

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Ce travail porte sur le couplage des déformations d'une bulle avec son sillage et sa trajectoire dans plusieurs configurations. Un formalisme de type eulérien-lagrangien permet d'écrire le problème sur un domaine mouvant faiblement déformé par rapport à la configuration de référence. Grâce à cette approche, il est possible d'étudier dans un cadre linéaire le couplage entre les déformations d'une bulle et les effets hydrodynamiques. En appliquant ce formalisme, on peut dans un premier temps calculer l'écoulement de base autour de la bulle et sa géométrie d'équilibre, et dans un second temps développer une approche de stabilité globale prédisant les seuils d'instabilité et les propriétés des modes d'oscillation. Afin de développer cette méthode, des résultats sur les oscillations linéaires de bulles et de gouttes dans un fluide au repos et sans influence de la gravité sont tout d'abord présentés et comparés à des résultats théoriques existants. Puis, le principe du formalisme eulérien-lagrangien est illustré en prenant pour problème modèle l'équation de la chaleur formulée sur un domaine arbitrairement déformé. Ce principe est ensuite appliqué aux équations de Navier-Stokes, aboutissant à une version linéarisée autour d'un domaine de référence incluant de manière complète les couplages entre déformations de la géométrie et perturbations de l'écoulement. On met en oeuvre sur le système obtenu une méthode itérative de Newton donnant accès à l'état de base, c'est-à-dire à l'écoulement stationnaire autour de la bulle et à sa forme d'équilibre. Ce même système permet par la suite d'effectuer une analyse de stabilité globale de l'écoulement autour d'une bulle qui se déforme. L'algorithme développé est d'abord appliqué au cas d'une bulle piégée dans un écoulement d'étirement, permettant de décrire des formes d'équilibre dans des régimes stables et instables. Le cas de la bulle en ascension dans un fluide pur est ensuite abordé. Une étude paramétrique est conduite, couvrant une vaste gamme de liquides allant de l'eau pure à des huiles de silicone très visqueuses. Les états de base calculés par la méthode de Newton ainsi que les seuils d'instabilité des sillages sont en bon accord avec les résultats expérimentaux. Dans les cas des liquides très peu visqueux, notre approche décrit de manière plus précise les effets visqueux dans les couches limites et donne des résultats plus satisfaisants que les approches numériques existantes. Elle confirme par ailleurs que la déformation de la bulle joue un rôle mineur dans ces gammes de paramètres. Pour les liquides plus visqueux en revanche, on observe un couplage plus fort entre déformation et sillage
This works deals with the coupling between time-dependent deformation, wake dynamics and path characteristics of a gas bubble in different configurations. An Eulerian-Lagrangian formalism is sought to formulate this problem in a moving domain having a small deformation compared to the reference configuration. This approach allows us to study the linear coupling between bubble deformations and hydrodynamic effects. This formalism makes it possible to first compute the base flow around a bubble and the corresponding steady shape, then to develop a global stability approach aimed at predicting the threshold of path instability and the properties of bubble oscillation modes. To develop this method, we first compute the linear oscillations of bubbles and drops in a quiescent fluid without gravity and compare them to existing theory. Then, the premise of the Eulerian-Lagrangian formalism is illustrated using a model equation, namely the heat equation written in an arbitrarily deformed domain. The same formalism is applied to the NavierStokes equations, yielding a linearized version of these equations in the neighbourhood of a reference domain, including the two-way coupling between shape deformations and perturbations of the base flow. With this system of equations at hand, we implement a Newton method that provides the steady state, i.e. the base flow around the bubble and its geometry. The same system allows us to carry out a global stability analysis of the flow past a deformable bubble. We first consider the situation where the bubble is trapped in a straining flow, for which we compute stable and unstable equilibrium shapes. We finally tackle the case of a buoyancy-driven bubble rising in a pure liquid. A parametric study is carried out over a wide range of liquids, from pure water to high-viscosity silicon oils. Steady states computed with the Newton method and instability thresholds are found to be in good agreement with experimental observations. For low-viscosity fluids, our approach captures the viscous effects that take place in the boundary layer better than existing computational approaches, yielding predictions for the onset of path instability in better agreemnt with observations. Furthermore, it confirms that time-dependent bubble deformations play a minor part for such liquids. In contrast, a stronger coupling between shape and path instabilities is observed in high-viscosity fluids
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Wang, Sheng-Yi, and 王盛儀. "Digital Image Correlation of Two-Dimensional Trajectory and Deformation Measurement and Applied to Construct 3D Surface." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8gp2vs.

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碩士
國立臺灣大學
機械工程學研究所
106
This thesis start from verifying 2D Digital Image Correlation (DIC) ability then expand the topic to 3D measuring errors, and finally build a 3D surface constructing system by using single camera and automatic devices. 2D DIC trajectory measurement ability can be proven by comparing to 1D LASER displacement meter result, and have successfully matched by measuring XXY precision stage origin motion trajectory and displacement. The stage operating system had defect of overshooting, and have been fixed by applying a protecting logic circuit which will block the motor input for state of limit. Also, the system is changed into MATLAB environment for compatibility and has improved the degree of freedoms for angle displacement, direction and speed. The stage is found having better trajectory result compared with the shape of input command while operating with lower speed. Measurement of a three-point-forced acrylic circular plate is used to verify the full-field displacement and deformation ability of 2D DIC. The result of displacement and deformation measured by 2D DIC system are similar to the displacement and deformation simulations computed by COMSOL. This thesis presents a relationship between 2D and 3D measurement error derived by geometry, and gives a procedure to make sub-pixel standard image which verifies the 2D DIC method with an accuracy of 0.02 pixel. 3D measurement error can be predict by applying coordinate values of point in 3D space and error on 2D plane and verified by a test measuring feature point in different positions. At last, the thesis build a 3D surface measuring system by single camera, a single axis robot and precision stage, which have the possibility to capture photos for different view angle. The system ability is verified from measuring checker board plane, and successfully built 3D surface of an unequal diameter PVC pipe and a Beethoven plaster statue.
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Book chapters on the topic "Trajectory deformation"

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Ghafouri, M., and F. Lestienne. "Gesture Orientation and Trajectory Deformation in Three Dimensional Space." In Progress in Gestural Interaction, 227–34. London: Springer London, 1997. http://dx.doi.org/10.1007/978-1-4471-0943-3_21.

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Lamiraux, Florent, and Olivier Lefebvre. "Sensor-based Trajectory Deformation: Application to Reactive Navigation of Nonholonomic Robots." In Visual Servoing via Advanced Numerical Methods, 315–34. London: Springer London, 2010. http://dx.doi.org/10.1007/978-1-84996-089-2_17.

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Chen, Huiqun, and Fenpin Jin. "A Novel Approach for Surface Topography Simulation Considering the Elastic-Plastic Deformation of a Material During a High-precision Grinding Process." In Proceeding of 2021 International Conference on Wireless Communications, Networking and Applications, 1176–93. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2456-9_118.

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AbstractA novel simulation approach for 3D surface topography that considers the elastic-plastic deformation of workpiece material during a high-precision grinding process is presented in this paper. First, according to the kinematics analysis for the abrasive grain during the grinding process, the motion trajectory of the abrasive grain can be calculated. Second, the kinematic interaction between the workpiece and the abrasive grains can be established, which integrates the elastic-plastic deformation effect on the workpiece material with the topography, the simulation results are more realistic, and the simulation precision is much higher. Finally, based on an improved surface applied to the grinding wheel, the surface topography of the workpiece is formed by continuously iterating overall motion trajectories from all active abrasive-grains in the process of high-precision grinding. Both the surface topography and the simulated roughness value of this work are found to agree well with those obtained in the experiment. Based on the novel simulation method in this paper, a brand-new approach to predict the quality of the grinding surface by providing machining parameters, selecting effective machining parameters, and further optimizing parameters for the actual plane grinding process, is provided.
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"deformation trajectory." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 349. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_40849.

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"Affine Trajectory Deformation for Redundant Manipulators." In Robotics. The MIT Press, 2013. http://dx.doi.org/10.7551/mitpress/9816.003.0047.

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Douglas, Kenneth. "What’s in the Offing?" In Bioprinting, 202–18. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190943547.003.0012.

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Abstract: This chapter attempts to peer into the possible future of bioprinting to consider two conceivable directions that bioprinting might take while also contemplating what we may be able to learn about bioprinting’s trajectory by reflecting on another biomedical quest—the twentieth-century’s attempt to conquer polio. In one study that might offer a route for bioprinting, a team created bioconstructs with cell densities approaching that of native tissue (about 108 cells/gram). The group used embedded 3D printing to create a branched, hierarchical network of vascular channels within a large, high cell density bioconstruct and perfused media through the channels that they created using fugitive ink. This was to provide nutrient support for the cells. They also built a high-density cardiac construct in which the cells beat synchronously and showed functional contractility. They quantitatively measured the deformation of the cardiac tissue during contraction.
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Gracheva, Lyudmila I. "Thermal Deformation and Strength of Materials for Heat-shielding Coatings of a Spacecraft on the Trajectory of Descent from Orbit." In Techniques and Innovation in Engineering Research Vol. 2, 109–31. Book Publisher International (a part of SCIENCEDOMAIN International), 2022. http://dx.doi.org/10.9734/bpi/taier/v2/7595f.

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Conference papers on the topic "Trajectory deformation"

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Kurniawati, Hanna, and Thierry Fraichard. "From path to trajectory deformation." In 2007 IEEE/RSJ International Conference on Intelligent Robots and Systems. IEEE, 2007. http://dx.doi.org/10.1109/iros.2007.4399235.

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Pham, Quang-Cuong, and Yoshihiko Nakamura. "Affine trajectory deformation for redundant manipulators." In Robotics: Science and Systems 2012. Robotics: Science and Systems Foundation, 2012. http://dx.doi.org/10.15607/rss.2012.viii.042.

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Delsart, V., and T. Fraichard. "Navigating dynamic environments using trajectory deformation." In 2008 IEEE/RSJ International Conference on Intelligent Robots and Systems. IEEE, 2008. http://dx.doi.org/10.1109/iros.2008.4650639.

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Singh, Arun Kumar, and Reza Ghabcheloo. "Trajectory Deformation Through Generalized Time Scaling." In 2018 17th European Control Conference (ECC). IEEE, 2018. http://dx.doi.org/10.23919/ecc.2018.8550056.

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Sun, Shih-Yu, Brian W. Anthony, and Matthew W. Gilbertson. "Trajectory-based deformation correction in ultrasound images." In SPIE Medical Imaging, edited by Jan D'hooge and Stephen A. McAleavey. SPIE, 2010. http://dx.doi.org/10.1117/12.844184.

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Wei, Wu, Xiang Zha, Qiuda Yu, and Jiankun Pang. "Trajectory Deformation Based on Energy Optimization and Obstacle Avoidance." In 2019 IEEE 9th Annual International Conference on CYBER Technology in Automation, Control, and Intelligent Systems (CYBER). IEEE, 2019. http://dx.doi.org/10.1109/cyber46603.2019.9066664.

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"REAL-TIME TRAJECTORY MODIFICATION BASED ON BÉZIER SHAPE DEFORMATION." In International Conference on Evolutionary Computation. SciTePress - Science and and Technology Publications, 2010. http://dx.doi.org/10.5220/0003086002430248.

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Kutsuzawa, Kyo, Sho Sakaino, and Toshiaki Tsuji. "Sequence-to-sequence models for trajectory deformation of dynamic manipulation." In IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2017. http://dx.doi.org/10.1109/iecon.2017.8216904.

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Yuan, Ye, and Hehua Ju. "An Improved Trajectory Deformation Approach for Wheel-based Mobile Robots." In 2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop (KAM 2008 Workshop). IEEE, 2008. http://dx.doi.org/10.1109/kamw.2008.4810619.

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Oikawa, Masahide, Kyo Kutsuzawa, Sho Sakaino, and Toshiaki Tsuji. "Admittance Control Based on a Stiffness Ellipse for Rapid Trajectory Deformation." In 2020 IEEE 16th International Workshop on Advanced Motion Control (AMC). IEEE, 2020. http://dx.doi.org/10.1109/amc44022.2020.9244385.

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