Дисертації з теми "Capteurs de force/torque"
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Castano, Cano Davinson. "Design of Multi-Axis Resonant Force/Torque Sensor for Robotics." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2089.
Повний текст джерелаWrist force/torque sensors used in robotic applications increase the performances and flexibility of the automated tasks. They also offer new possibilities in the manufacturing process, where physical contact between the work-piece and environment is required. The wide spreading of these sensors is for now restricted by their features. As an alternative to the existing straingauges force sensors, our work presents a resonant composite structure, which is sensitive to multiple components of force that are considered via the pre-stress effect. Structurally bonded piezoelectric patches are used to bring the structure to its resonance, which is shifted according to applied forces. The relationship between force and frequency shift is modelled considering the multi-physics of this smart structure. A prototype was tested and validated
ANDRADE, CHAVEZ FRANCISCO JAVIER. "Force-Torque Sensing in Robotics." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/942466.
Повний текст джерелаGunzel, Charles A. "FSR based force torque transducer design." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA271337.
Повний текст джерелаMohy, El Dine Kamal. "Control of robotic mobile manipulators : application to civil engineering." Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAC015/document.
Повний текст джерелаDespite the advancements in industrial automation, robotic solutions are not yet commonly used in the civil engineering sector. More specifically, grinding tasks such as asbestos removal, are still performed by human operators using conventional electrical and hydraulic tools. However, with the decrease in the relative cost of machinery with respect to human labor and with the strict health regulations on such risky jobs, robots are progressively becoming credible alternatives to automate these tasks and replace humans.In this thesis, novel surface grinding control approaches are elaborated. The first controller is based on hybrid position-force controller with compliant wrist and a smooth switching strategy. In this controller, the impact force is reduced by the proposed smooth switching between free space and contact modes. The second controller is based on a developed grinding model and an adaptive hybrid position-velocity-force controller. The controllers are validated experimentally on a 7-degrees-of-freedom robotic arm equipped with a camera and a force-torque sensor. The experimental results show good performances and the controllers are promising. Additionally, a new approach for controlling the stability of mobile manipulators in real time is presented. The controller is based on zero moment point, it is tested in simulations and it was able to actively maintain the tip-over stability of the mobile manipulator while moving. Moreover, the modeling and sensors uncertainties are taken into account in the mentioned controllers where observers are proposed. The details of the development and evaluation of the several proposed controllers are presented, their merits and limitations are discussed and future works are suggested
Mahadevan, Arjun. "Force and Torque Sensing with Galfenol Alloys." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259727083.
Повний текст джерелаWest, Jerry. "Orthoplanar Spring Based Compliant Force/Torque Sensor for Robot Force Control." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6637.
Повний текст джерелаIslam, Mohammed Rakibul. "Cogging Torque, Torque Ripple and Radial Force Analysis of Permanent Magnet Synchronous Machines." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1239038005.
Повний текст джерелаLi, Feng Frank. "Design and analysis of fingertip Stewart Platform force/torque sensor." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0020/MQ37577.pdf.
Повний текст джерелаIagnemma, Karl David. "Manipulator identification and control using a base-mounted force/torque sensor." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42678.
Повний текст джерелаYuan, Yi. "Torque ripple reduction in a permanent magnet synchronous machine using repetitive control techniques (Drift)." Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=d81a622d-ce54-4be1-8bed-491ba10fa201.
Повний текст джерелаPermanent magnet synchronous machines (PMSMs), due to their attractive efficiency, reliability and performance, are rapidly gaining popularity in many applications. However, torque ripples of PMSM generally cause speed ripples, which are considered as an important hindrance in some low speed applications. The repetitive control (RC), which is particularly suitable for the reduction of periodic disturbance, is chosen to achieve the torque ripple reduction, because torque ripples of PMSM can be considered as periodic disturbances. The use of the RC for machine torque ripple reduction is not new. However, the reduction is always achieved at a given speed. This is due to the nature of the RC. So as to extend the use of the RC to varying speeds, the angle-based RC technique, which takes the mechanical angle as the running variable, is considered in this work. Thanks to the fixed relationships between the torque ripples and the mechanical angle, the angle-based repetitive controller can keep its rejection capability, whether the speed is constant or not. Besides, applying the RC in a PMSM drive requires to implement a new controller, which is hardly achievable for commercial systems. In order to apply the RC for PMSM drives, this paper proposes to include the RC into a speed sensor, forming a particular speed sensor called repetitive smart sensor. Accordingly, the torque ripple reduction can simply be accomplished by changing a conventional speed sensor for a repetitive smart one. Finally, the efficiency of the proposed angle-based repetitive smart sensor is verified through experimental results
Shaw, I., BS Shaw, JF Cilliers, and DT Goon. "Influence of visual feedback on knee extensor isokinetic concentric and eccentric peak torque." African Journal for Physical, Health Education, Recreation and Dance, 2009. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001651.
Повний текст джерелаYesudasu, Santheep. "Cοntributiοn à la manipulatiοn de cοlis sοus cοntraintes par un tοrse humanοïde : applicatiοn à la dépaléttisatiοn autοnοme dans les entrepôts lοgistiques". Electronic Thesis or Diss., Normandie, 2024. https://theses.hal.science/tel-04874770.
Повний текст джерелаThis PhD thesis explores the development and implementation of URNik-AI, an AI-powered automated depalletizing system designed to handle cardboard boxes of varying sizes and weights using a dual-arm humanoid torso. The primary objective is to enhance the efficiency, accuracy, and reliability of industrial depalletizing tasks through the integration of advanced robotics, computer vision, and deep learning techniques.The URNik-AI system consists of two UR10 robotic arms equipped with six-axis force/torque sensors and gripper tool sets. An ASUS Xtion RGB-D camera is mounted on Dynamixel Pro H42 pan-tilt servos to capture high-resolution images and depth data. The software framework includes ROS Noetic, ROS 2, and the MoveIt framework, enabling seamless communication and coordination of complex movements. This system ensures high precision in detecting, grasping, and handling objects in diverse industrial environments.A significant contribution of this research is the implementation of deep learning models, such as YOLOv3 and YOLOv8, to enhance object detection and pose estimation capabilities. YOLOv3, trained on a dataset of 807 images, achieved F1-scores of 0.81 and 0.90 for single and multi-face boxes, respectively. The YOLOv8 model further advanced the system's performance by providing keypoint and skeleton detection capabilities, which are essential for accurate grasping and manipulation. The integration of point cloud data for pose estimation ensured precise localization and orientation of boxes.Comprehensive testing demonstrated the system's robustness, with high precision, recall, and mean average precision (mAP) metrics confirming its effectiveness. This thesis makes several significant contributions to the field of robotics and automation, including the successful integration of advanced robotics and AI technologies, the development of innovative object detection and pose estimation techniques, and the design of a versatile and adaptable system architecture
Chakraborty, Sayan. "Experimental modeling of EVA tasks and workload using force-torque sensing apparatus." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/42457.
Повний текст джерелаRafla, Nader Iskander. "Visually guided tactile and force-torque sensing for object recognition and localization." Case Western Reserve University School of Graduate Studies / OhioLINK, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=case1059578946.
Повний текст джерелаAndrade, José Henrique Araújo Lopes de. "Acoustic radiation force and torque on suspended objects in an inviscid fluid." Universidade Federal de Alagoas, 2014. http://www.repositorio.ufal.br/handle/riufal/1694.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Recentes avanços e interesse em manipulação de partículas necessitam de uma maior compreensão teórica da força de radiação e torque acústico exercidos sobre uma configuração de múltiplas partículas. Nesta tese, nós estudamos teoricamente a força de radiação e torque acústico exercido por um feixe acústico arbitrário em um conjunto de partículas esféricas suspensas em um fluido não viscoso. O método baseia-se na expansão de ondas parciais (EOP) e no teorema translacional da adição para funções de onda esférica. A combinação do método de ondas parciais com o teorema da adição nos permitir resolver o problema de espalhamento mútiplo computando numericamente os coeficientes da expansão em um sistema de equações lineares. Por outro lado, quando consideramos a força e torque de radiação exercidos sobe uma única esfera, o teorema da adição tem a vantagem para resolver este problema exatamente. Após a obtenção dos coeficientes, a força e o torque de radiação são calculados usando um método em séries no campo distante. Para ilustrar o método, a força e o torque exercidos sobre uma ou multiplas esferas são analisados. Para o de uma única esfera, a força de radiação é gerada por um feixe de ultrassom focalizado. Para uma configuração de multiplas esferas, a força de radiação é induzida por ondas planas e estacionarias. Numa configuração específica de três gotas de azeite suspensas em água, com raios da ordem do comprimento de onda, verificou-se que as ondas reespalhadas produzem uma força de interação acústica, o que altera significativamente a força de radiação em cada gota em função da distância inter-gota. Além disso, verificou-se, pela primeira vez que um torque de interação acústico devido a uma distribuição espacial não simétrica da densidade de energia acústica para as gotas. Além disso, nosso estudo não tem restrições quanto ao tamanho esferas em comparação com o comprimento de onda, nem sobre a sua composição, que inclui rígida, líquida, elástica e sólidos viscoelásticos. Por fim, este estudo tem aplicações diretas sobre os métodos de manipulação de objetos sem contato por ondas acústicas, tais como a levitação acústica, pinças acústicas e acoustophoresis em dispositivos lab-on-a-chip.
Weill-Duflos, Antoine. "Interfaces et capteurs pour une chaine de micro-téléopération." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066147/document.
Повний текст джерелаTeleoperation opens up new possibilities for interaction with the micro-world. Adequate systems make it possible for human to manipulate elements on microscopic scales. An added haptic feedback provides information crucial for a natural interaction. A bilateral coupling between the subsystems offers the best haptic transparency. This thesis addresses the design of a complete haptic teleoperation chain by focusing on its key elements. Three parts are detailed: The first part describes improvements of the high fidelity one degree of freedom haptic interface designed previously. First, the precision of the forces produced is improved. This improvement is related to the measurement of the motor velocity at high sampling frequencies. Then, the device is precisely caracterized. The second part describes the design of two new force sensors designed specifically for interactions with the micro-world. The forces are measured by compensation. Two approach are observed to expand the frequencies of forces measurable by the sensors. First approach try to reduce the mass, a new sensor on a micrometric scale is built with MEMS technologies. The second approach offer a new design of the sensor. In particular, the stiffness in the guidance is removed. The third part describes the design of a new haptic interface with multiple degrees of freedom. This interface combines the performances of the one degree of freedom interface with a 2D configuration. The key elements of its design are the an air bearing for frictionless guidance and linear induction motors for reduced inertia
Hickok, Mark D. "Effects of bit type on maximum torque and axial force using manual screwdrivers." Thesis, Marquette University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1548501.
Повний текст джерелаThe screwdriver is a tool that has been among the most widely used hand tools for decades and continues to be used in the workplace to perform a variety of fastening tasks. Advancements in fastener technology have been complemented by the development of new types of screwdriver bits. While designs may vary, so do the force application requirements placed on the tool user. The primary objective of this experiment is to analyze the relationship between user torque and screwdriver bit design. A further objective is to utilize the results to develop an effort metric by which bits of different designs can be compared. In this experiment, three types of screwdriver bit designs (straight, Phillips, and combination of straight/Phillips (ECX)) were tested to determine how the design affects the amount and type of force applied by the user when performing a fastening task. The designs were tested to simulate fastener tightening and loosening operations. Sixteen participants were tested in this study. Although there was no significant effect, the data suggest that the Phillips bit design allow subjects to exert the maximum torque and the minimum axial force. This divergence suggests that the Phillips bit may have a higher biomechanical effort ratio, which is greater torque for the same or lower axial force. Finally, the data suggest there is little difference in user torque exertion between the ECX bit and the straight bit designs. Subjective assessment indicated that users overwhelmingly preferred the Phillips bit design. Bit designs requiring less axial force for the same torque exertion level reduce the overall muscular effort of the user, allowing work to be completed more efficiently and may reduce the risk of musculoskeletal disorder affecting the wrist, elbow, and shoulder. Results may also assist designers by allowing them to select fasteners that provide sufficient mechanical integrity of the design while maximizing user effectiveness.
Goyhenex, Gehin Claudine. "Conception et réalisation d'un capteur résonant piézoélectrique pour la mesure de force statique." Chambéry, 1998. http://www.theses.fr/1998CHAMS005.
Повний текст джерелаBUEB, JEAN-LUC. "Mesures de contractions d'organes in vitro : evolution des capteurs de force, et comparaison de 2 modeles de capteurs isometriques." Strasbourg 1, 1987. http://www.theses.fr/1987STR10737.
Повний текст джерелаWeight, Ryan G. "High-Torque Capacity Compliant Centrifugal Clutches." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd383.pdf.
Повний текст джерелаHancock, Philip Jackson. "Adaptive Torque Control of a Novel 3D-Printed Humanoid Leg." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99408.
Повний текст джерелаMaster of Science
In order to function safely in a dynamic environment with humans and obstacles, a robot must be able to actively control its interaction forces with the outside environment. In these applications a high-fidelity model of the robot is required. In the case of a 3D-printed robot, the components in the robot cannot be easily modeled due non-uniform densities, inconsistencies among the 3D printers used in manufacturing, and the use of different plastics with mechanical properties that are not widely known. To address this issue, this thesis presents an adaptive control framework which actively modifies the model parameters in order to achieve satisfactory tracking performance. In this work, the equations of motion of the robot are manipulated in such a way that the unknown quantities are separated from the known quantities. The unknowns are updated in real time using adaptive laws derived from Lyapunov stability theory. The proposed control system consists of a high-level torque controller to regulate deviations from the nominal trajectory, and a low-level force controller to track the joint torques commanded at the high-level. The proposed system is evaluated on an early prototype of the robot consisting of a 3 degree of freedom leg, and two actuator test setups for the low-level controller.
Uhart, Maylis. "Amélioration de la précision du placement de fibres robotisé en utilisant un schéma de commande hybride externe force / vision." Nantes, 2014. http://www.theses.fr/2014NANT2028.
Повний текст джерелаComposite materials are increasingly used in the demanding field of aeronautics. To meet this growing need, the company Coriolis Composites has developed an Automated Fibre Placement device already on the market. This process uses an industrial manipulator robot. This fibre placement task requires a compacting strength adapted to the material used. For the robot, the reference trajectories in position of each tape are prescribed off-line. However, accuracy problems of tape placement appear. This thesis shows the use of force servoing to control the compacting strength and the use of visual servoing to control the lateral position of the tape. An experimental setup has been designed based on industrial devices similar to Coriolis Composites ones and a software application has been developed using a six axis force sensor and an industrial camera. The proposed scheme is composed of three external loops which generate the position setpoint for the industrial controller. The use of this force - visual combined servoing has improved the accuracy and the quality of the placement tapes
Desmaële, Denis. "Design of a planar resonant force sensor with an application to cell mechanics." Paris 6, 2011. http://www.theses.fr/2011PA066477.
Повний текст джерелаNelson, Alexandra T. "Press fit design : force and torque testing of steel dowel pins in brass and nylon samples." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/36722.
Повний текст джерелаIncludes bibliographical references.
An experimental study was conducted to determine the accuracy of current press fit theory when applied to press fit design. Brass and nylon hex samples were press fitted with hardened steel dowel pins. Press fit force and torque required to induce slipping were measured experimentally. Sample dimensions and material properties were utilized to predict expected force and torque levels, which were then measured experimentally. Brass press fit forces proved difficult to predict due to plowing effects in tight interference press fits where material yielding was observed. However, once vertical force was removed, torque was applied to each sample. The observed torque values matched press fit theory well suggesting that the interface pressure of the press fit can be accurately predicted by theory. The brass torque samples matched theory well once material yield conditions were taken into account. The creep sensitivity of the nylon samples made predictions over the testing period unreliable. Results show the need for further testing with specific attention to precision in sample machining and measurements. Other considerations include press fit interface roughness and plowing effects during press fitting.
by Alexandra T. Nelson.
S.B.
Tucker, John R. "The design, manufacture and verification of a high capacity force and moment measurement system /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0010/MQ36189.pdf.
Повний текст джерелаFail, Abderrahim. "Etude de capteurs-émetteurs et des procédés de télétransmission associés : applications à la rééducation des membres inférieurs." Vandoeuvre-les-Nancy, INPL, 1990. http://www.theses.fr/1990INPL055N.
Повний текст джерелаMerrien, Arnaud. "Conception de capteurs de force pour l'étude de la saisie d'objets en prises pollicidigitale et palmaire." Le Mans, 2001. http://www.theses.fr/2001LEMA1023.
Повний текст джерелаChedevergne, Fany. "Baropodomètre écologique : développement d'un chausson à semelle instrumentée pour l'analyse de la marche." Besançon, 2008. http://www.theses.fr/2008BESA2024.
Повний текст джерелаMore and more often, practitioners use the plantar pressure analysis to observe their patient's balance and gait troubles. The health of the neuro-muscular system can be known by qualifying and quantifying the foot laying on the floor. It ables to diagnose, to follow the cure and also to prevent from possible traumas Severals and various baropodometrical tools are available but their functionalities can't totally answer the medical demands. Few of them can record barefoot walk and none do it over numerous step with good reproducibility. That's why this study deals with a new baropodometrical device developed in our lab which is a medical shoe equipped with force sensors. The analysis of the first prototype reveals a limited use fitting only healthy people. After several mechatronical improvements, a new prototype, which could be used with any individual whatever the pathology he suffers, is proposed. Beside, a data processing is developed to plot easily and rapidly the dynamics solicitation of the foot during the gait The first clinical applications lead to the conclusion that the device is still perfectible concerning its measurement accuracy. Nevertheless, the evolution of the plantar pressure distribution is clearly given along the time. The prototype is usable in a clinical context as weIl as in an ecological context at the patient's home. The balance and the locomotion analysis could be proceed with a more spontaneous and regular method. This would be better for following elderly people to prevent them from faIls, or diabetic individuals and their risk of ulcer, or operated patient during their readaptation, and more widely anyone with any pathology
Gundogmus, Omer. "SIMULTANEOUS TORQUE RIPPLE AND ACOUSTIC NOISE MITIGATION IN SWITCH RELUCTANCE MACHINES." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1579790717180753.
Повний текст джерелаAlahmari, Sami Khaloufah M. "Muscle force production and neuromuscular fatigue responses to neuromuscular electrical stimulation and tendon vibration." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/236174/1/Sami_Alahmari_Thesis.pdf.
Повний текст джерелаDong, Fanghong. "Cartesian Force Estimation of a 6-DOF Parallel Haptic Device." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264990.
Повний текст джерелаEn haptikenhet gör det möjligt att förmedla en känsla av kontakt i en virtuell värld genom att skapa krafter som motverkar en rörelse . Hur denna kraft skapas och kontrolleras är av stor vikt för att få den så verklighetstrogen som möjligt. Om man har en kraftsensor kan den användas till att utforma en kraftreglering med återkoppling, men på bekostnad av en ökad massa och tröghet vid användarens hand. Detta har medfört ett ökat intresse under de senaste åren för att på olika sätt försöka uppskatta den kraft som återkopplas till användaren utan att behöva en kraftsensor. Målet för detta examensarbete är att utveckla en algoritm för att uppskatta en kontaktkraft i realtid baserat på antagandet att motormomentet är proportionellt beroende av strömmen. Algoritmen kan sedan användas för att konstruera en sluten reglerloop med kraftåterkoppling för en haptisk enhet. Forskningsfrågorna som behandlas i detta examensarbete är; hur kan vi utforma en algoritm för estimering av kontaktkrafter för haptikenheten TAU hur kan vi utforma en experimentell försöksuppställning för mätning av de verkliga kontaktkrafterna från TAU vid kontakt. hur kan vi använda resultaten från experimenten för utvärdering av algoritmen För testning och utvärdering av algoritmen har en virtuell värld skapats för att efterlikna en simuleringsmiljö som haptikenheten är tänkt att användas i. En kraftsensor har monterats under det verktyg som användaren håller i när enheten används när ett typiskt ingrepp ska övas i en simulator, t.ex. borrning i en tand. Vid experimenten beräknar algoritmen den uppskattade kontaktkraften som användaren känner baserat på den uppmätta strömmen för de sex motorer som aktiveras av kontakten. Dessa beräknade värden har sedan jämförts med de från kraftsensorn uppmätta för att avgör om algoritmen är tillräckligt noggrann. Analysen visar att noggrannheten är tillräckligt bra för att vara en lovande ansats till att användas för kraftuppskattning vid reglering av kontaktkraft för haptikenheten TAU.
Kovaleski, Joao Luiz. "Etude, modélisation et réalisation de capteurs d'accélération et force à base de polymère piézoélectrique PVF2." Grenoble 1, 1992. http://www.theses.fr/1992GRE10122.
Повний текст джерелаMarangoni, Rafael R. [Verfasser], Thomas [Akademischer Betreuer] Fröhlich, Tino [Gutachter] Hausotte, and Dorothea [Gutachter] Knopf. "Traceable multicomponent force and torque measurement / Rafael Romos Marangoni ; Gutachter: Tino Hausotte, Dorothea Knopf ; Betreuer: Thomas Fröhlich." Ilmenau : TU Ilmenau, 2019. http://d-nb.info/1184797226/34.
Повний текст джерелаSargeant, Ramon Bradley. "A multi-axial optical fibre and linear polarizer based force and torque sensor for dexterous robotic fingertips." Thesis, King's College London (University of London), 2014. http://kclpure.kcl.ac.uk/portal/en/theses/a-multiaxial-optical-fibre-and-linear-polarizer-based-force-and-torque-sensor-for-dexterous-robotic-fingertips(a9c419a3-901e-4a56-9b02-00648539d17e).html.
Повний текст джерелаNazeer, Sébastien. "Conception et réalisation de micro-capteurs de pression pour l’instrumentation d’interface à retour d’effort." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112140/document.
Повний текст джерелаThis PhD work presents the design and realization of a 3D flexible force sensor that can be integrated in surgical gloves or tools to qualify and quantify the grip forces including normal and shear stress. A state of the art first presents the suitable technologies for this application. Then, the choice is focused on the design and dimensioning, using Hooke’s law, of a capacitive tri-axis sensor of 8 x 8 x 3 cells/cm² matrix from a flexible dielectric of low Young’s modulus around 1 MPa. Designed cells have a nearby nominal capacitance of 0.5 pF. A variation of 30% is expected at maximum force range of 100 N/cm². The aimed dynamic is 1 to 1000. It corresponds to a resolution of 0.15 fF or 100 mN/cm². The flexible sensor fabrication is tackled by taking into account the characterization of support materials, notably the Kapton, in a stream of microfabrication. Metallization and adhesion of electrodes on PDMS problems lead to the development of a process based on film transfer technology adapted to electrodes buried in PDMS. On the basis of ANSYS simulations, the operating physical principle is validated. They are confirmed by static and in charge electrical measurements of the tactile sensor for forces ranging from 10 mN to 20 N
Helali, Saloua. "Conception et réalisation de matériaux biofonctionnels pour des dispositifs capteurs impédimétriques." Ecully, Ecole centrale de Lyon, 2005. http://bibli.ec-lyon.fr/exl-doc/shelali.pdf.
Повний текст джерелаThe biofonctionnalisation is a key step for the realization of the biosensor and thus for obtaining good analytical performances. Two procedure of fonctionnalization of the gold surface were studied by impedance spectroscopy. Initially, we formed on the gold electrode a mixed self-assembled monolayer consisting of 1,2 dipalmitoyl-Sn-glycero-3-phosphoethanolamine-N-(biotinyl) (biotinyl-EP) and acid 6-mercaptohexadecanoic (MHDA). The tethered neutravidin was used the biotin sites present in the mixed monolayer, with those associated to the biotinyl-antibody. Two antibody-antigen system : Biotinyl-antiHemoglobine/Hemoglobine and Biotinyl-Fab K47/Atrazine fragment were detected. Second procedure that of the immobilization of a layer of the magnetic particles marked by the streptavidine by applying magnetic fields of 300 mT
Lakhmi, Riadh. "Étude de micropoutres sérigraphiées pour des applications capteurs." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14358/document.
Повний текст джерелаThe project concerns the conception, fabrication and characterization of cantilever-type MEMS structures for sensors applications. An alternative process to silicon related ones, associating the screen-printing technique to a sacrificial layer (SrCO3), was used to realize piezoelectric cantilevers (PZT material utilized as actuator and transducer) in a first time. Detections in gas phase were performed successfully with and without sensitive layer thanks to the unusual 31-longitudinal vibration mode. Namely, we were able to detect toluene at concentrations as low as 20ppm with a PEUT sensitive layer. Other species like water, ethanol or hydrogen could be detected without sensitive layer in order to get rid of the sensitive layer-related issues (ageing for example). Preliminary characterizations were carried out in liquid phase in a view to perform liquid phase detection. Besides, a cantilever-based force sensor, fabricated thanks to the same fabrication process was designed. This last one integrates a piezoresistor allowing the transduction of the mechanical signal linked to the strain overcome by the microcantilever. Force detections in static mode (without any actuator) permitted the sensors’ characterization. Indeed, their sensitivity, force range, minimal detectable force and linearity were carried out
Roche, Denis. "Conception et réalisation d'un capteur piézoélectrique de contraintes de cisaillement pour structure adaptative." Lyon, INSA, 1995. http://www.theses.fr/1995ISAL0062.
Повний текст джерелаThe scope for our work is the conception, the modelling and the realisation of a piezoelectric sensor for the measurement of static and dynamic shear stresses in hydrodynamic flow. The values of the shear stresses ta be measured in a laminar or a turbulent flow are only of a few Pascal. The usual types of piezoelectric sensors can not perform this measurement with a satisfactory accuracy. Three different solutions have been investigated in out:'thesis work. The use of the shear mode of a piezoelectric ceramic has first been studied. Surface Acoustic Wave (SAW) devices have then been proposed. As these surface waves are very sensitive to external perturbation,. The shear stresses are responsible for a resonance frequency shift. The third device is a floating element type sensor. It consists of a sensing armature, in contact with the flow, and attached ta a fixed one by at least two piezoelectric bimorphs. The floating armature allows the measurement of the drag force counterbalancing the shear effort. This sensor has a high sensitivity and can perform quasi-static and dynamic shear stress measurement using a simple charge amplifier. Another concept, based on the last principle, is the composite transducer. This sensor is entirely embedded and constitutes a composite material, which has the shear stress sensitivity required
Haidacher, Steffen. "Contact point and object position from force-torque and position sensors for grasps with a dextrous robotic hand." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972223711.
Повний текст джерелаGoodson, Caleb Benjamin. "Mechanical Redesign and Fabrication of a 12 DOF Orthotic Lower Limb Exoskeleton and 6 Axis Force-Torque Sensor." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/100734.
Повний текст джерелаMaster of Science
Recent developments in the fields of robotics and exoskeleton design have increased their feasibility for use in medical rehabilitation and mobility enhancement for persons with limited mobility. The Orthotic Lower Limb Exoskeleton (OLL-E) is an exoskeleton specifically designed for enhancing mobility by allowing users with lower limb disabilities such as spinal cord injuries or paraplegia to walk. The research detailed in this thesis explains the design and manufacturing processes used to make OLL-E as well as providing design details for a force sensor built into the exoskeleton foot. Before manufacturing could take place some parts needed to be redesigned and this thesis provides insight into the reasons for these changes. After the manufacturing and design process was completed the OLL-E was assembled and the project can now move forward with physical testing.
Démoulin, Damien. "Les billes magnétiques comme capteurs de force : application à la pression de croissance de filaments d'actine." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://pastel.archives-ouvertes.fr/pastel-00733095.
Повний текст джерелаMurphy, Devon Patrick. "Analysis of a Rotary Ultrasonic Motor for Application in Force-Feel Systems." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/34989.
Повний текст джерелаMaster of Science
Wang, Yawen. "Torque Load Effect on Multi-Point Mesh and Dynamics of Right-angle Geared Drives." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1384870250.
Повний текст джерелаSmith, Gregory. "An Analysis of Critically Enabling Technologies for Force and Power Limiting of Industrial Robotics." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1501860011636585.
Повний текст джерелаWatanabe, Renato Naville. "Simulação computacional do sistema neuromuscular para o estudo da variabilidade do torque exercido durante uma flexão plantar." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-30032012-123747/.
Повний текст джерелаThe muscle force variability, usually in a constant and isometric force task, has been studied both experimentally and using computational tools. However, most studies using computer simulations have been made on tasks that use only one muscle, usually in the hand. As far as is known, no study has analyzed, either theoretically or experimentally, the overall behavior of the torque variability during plantar flexion. Therefore, this work aims to study the plantar flexion torque variability by means of mathematical models and simulations, comparing the results with those obtained in human experiments carried out locally. A first attempt was made using a Hill-type muscle contraction model activated by the electromyogram obtained from each of the three triceps surae muscles. This approach was not successful in terms of reproducing the torque variability results obtained from humans, although it estimated well the average value of plantar flexion torque. This inability to reproduce the torque variability found in experimental data was probably due to the information loss in the electromyogram of the spike times of motoneurons. In a second approach, the firing of individual motoneuron were obtained from a neuromuscular simulator developed locally, called ReMoto, capable of providing the spike times of all motoneuron models that activate each muscle and the respective muscle force. The latter is generated in the simulator from the forces generated by each motor unit that composes the muscle. However, the ReMoto original version was almost completely parameterized using data from cats and, hence, it was necessary to modify various parameter values (such as motor unit twitchs and action potential amplitudes) and models (such as the recruitment threshold and force saturation) before using the simulator to study torque variability in humans. Besides the second order twitch model already implemented in the original version of the simulator, two other models were implemented in this work. One was a more refined twitch model and the second was a Hill-type model modified to be activated by the ReMoto simulator motoneuron pool. New simulations were run with the new version of the simulator (adapted to human data) and the fittings to the experimental data (torque and electomyogram envelope variability) were good, suggesting that the models in the simulator are a reasonable representation of what occurs in the living human being.
Cailliez, Jonathan. "Contributions à la modélisation et la commande de capteurs de forces actifs pour la méso et micro-robotique." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS278.
Повний текст джерелаThis thesis focuses on the development of an original instrumentation, with performances beyond the state of the art, for the characterization and the measurement of forces at the small scales. The work covers the measurement of a wide range of forces involved in meso and micro-robotics, from intermolecular forces of the order of a few µN to forces at the Newton level. The focus lies in the development and implementation of sensors based on an active technology particularly adapted for the characterization of forces with a variable gradient thanks to a quasi-infinite sensor stiffness in closed loop. Three main contributions have been made. On the methodological aspect, a new robust hybrid control approach based on Eigen structure assignment has been proposed and experimentally validated for the robust characterization of intermolecular interaction forces using an Atomic Force Microscope (AFM). This characterization has allowed defining the basis of the specifications for the design and the control of active sensors better suited to finely characterize unstable areas in which the force gradients are important. The second contribution lies in the development, design, control and implementation of an original MEMS (Micro-Electro-Mechanical System) type active sensor with the particularity of having a linear electromechanical characteristic over its entire measurement range, i.e. +- 20 µN, with a bandwidth greater than 2kHz. The third contribution lies in the proposition of a new architecture for the active measurement of forces over ranges from mN to N based on a magnetic actuation and an air bearing. This sensor has been implemented for the measurement of magnetic forces with unstable areas when the distance between the sensor tip and the magnetic sample is below a certain threshold. The perspectives to this thesis are numerous in materials science, biology and more generally in physics. It particularly opens a new path in scientific research related to active AFM
Boucher, Mathieu. "Limites et précision d'une analyse mécanique de la performance sur ergocycle instrumenté." Poitiers, 2005. http://www.theses.fr/2005POIT2260.
Повний текст джерелаIn biomechanics, the modelling of the human body is a major stake to estimate, in an imposed task, muscular effort and subjacent metabolic expenditure. In parallel, the evaluation of physical abilities in sport medicine needs to characterize the athletes' motion and their interactions with the external environment, in order to compare physiological measurements more objectively. These two orientations are based mainly on the activities of cycling. The objective of this work is thus to study the limits of the mechanical analysis of the performance on ergocycle using inverse dynamics technique. These limits depend on the measuring instruments and on the adequacy between the data input of the cycling model and the data measured. The evaluations of the uncertainty of the quantities used in the calculation of the intersegment effort allow to estimate the consequences of them on the precision of each mechanical parameter used in the analysis of the performance
Afsharian, Reza, and Antonios Theodoropoulos. "Modular friction test rig for measuring torque and tension in threaded fasteners." Thesis, KTH, Maskinkonstruktion (Avd.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235540.
Повний текст джерелаDenna rapport beskriver utvecklingen av en modulär friktionsprovrigg för gängade fästelement. Den utvecklade enheten kan mäta moment och klämkraft under åtdragning av gängade skruvar, med en storlek mellan M3 och M14 och klämlängd på 30-160mm. Designen möjliggör användning av flera last- och vridmomentceller och intervallet är upp till 100kN klämbelastning och 200Nm påfört vridmoment. Provriggen är en forskningsrigg, och den kommer att användas av Atlas Copco för att bestämma friktionsegenskaperna i åtdragning och möjliggöra experiment på skruvar av olika material, och med olika ytbeläggningar och ytbehandlingar. Denna rapport avslutas med ett designförslag, som utvärderas analytiskt och testprincipen demonstreras med hjälp av en prototyp. Mätningarna tas från skräddarsydda sensorer, som kan kalibreras individuellt och som är enkelt utbytbara. Dessutom är en anordning utvecklad för att tillåta användaren att ändra styvheten hos förbandet. Slutligen ges en rekommendation för en vidareutveckling, som möjliggör mätning av skallmomentet. Detta förslag är ett genombrott jämfört med andra existerande testriggar, och kommer att bidra till att verifiera friktionsmätningarna med hög precision.
Lakhmi, Riadh. "Etude de micropoutres sérigraphiées pour des applications capteurs." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00671386.
Повний текст джерелаLu, Wenzhe. "Modeling and control of switched reluctance machines for electro-mechanical brake systems." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1123550135.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains xvii, 158 p.; also includes graphics (some col.). Includes bibliographical references (p. 137-148). Available online via OhioLINK's ETD Center