Bibliografie tematiche / System of spherical movement

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Letteratura scientifica selezionata sul tema "System of spherical movement"

Autore: Grafiati
Pubblicato: 30 maggio 2022
Ultima modifica: 31 maggio 2022

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Articoli di riviste sul tema "System of spherical movement"

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Xie, Shao Rong, Jin Song Miao, Heng Yu Li, Yu Mei Zhou e Jun Luo. "A Control System of Binocular Eyes Based on DSP TMS320F2812". Applied Mechanics and Materials 128-129 (ottobre 2011): 765–70. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.765.

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This paper mainly introduces a binocular eyes system which is similar to the human eyes. The whole control system is based on neural network control model of human eyes, while the structure adopts spherical parallel mechanism to mimic the human eye movement. The whole Binocular control system consists of DSP embedded control system and PC platforms, which achieves the movement of the vestibular ocular reflex, convergence and conjugate movement, thus realizing good tracking of moving targets. This control system has compacted configuration and high reliability. A large number of experiments were done to validate the whole excellent system performance.
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Zhao, Ji Zeng, Min Xu e Wei Fu. "Space Arc Trajectory Planning Based on PCI Motion Control System". Advanced Materials Research 542-543 (giugno 2012): 573–77. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.573.

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This paper presents a method using the PCI motion controller which provides function of space linear interpolation to implement space arc trajectory planning on three dimensional motion platform. While make plane constraint to space spherical, we get space arc trajectory in Cartesian Coordinate System. Using the constraint arc by appropriate of precision discrete, function of space linear interpolation and the movement buffer nested in controller card to implement space arc movement. Writing control interface by using VC++ and actually validated on XYZ-three dimensional motion platform. The result confirmed feasibility and accuracy of this method.
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Wang, J., J. J. Xu e L. Zhang. "Simulation on the aggregation process of spherical particle confined in a spherical shell". International Journal of Modern Physics B 30, n. 11 (28 aprile 2016): 1650065. http://dx.doi.org/10.1142/s021797921650065x.

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The aggregation process of spherical particles confined in a spherical shell was studied by using a diffusion-limited cluster–cluster aggregation (DLCA) model. The influence of geometrical confinement and wetting-like properties of the spherical shell walls on the particle concentration profile, aggregate structure and aggregation kinetics had been explored. The results show that there will be either depletion or absorption particles near the shell walls depending on the wall properties. It is observed that there are four different types of density distribution which can be realized by modifying the property of the inner or outer spherical shell wall. In addition, the aggregate structure will become more compact in the confined spherical shell comparing to bulk system with the same particle volume fraction. The analysis on the aggregation kinetics indicates that geometrical confinement will promote the aggregation process by reducing the invalid movement of the small aggregates and by constraining the movement of those large aggregates. Due to the concave geometrical characteristic of the outer wall of the spherical shell, its effects on the aggregating kinetics and the structure of the formed aggregates are more evident than those of the inner wall. This study will provide some instructive information of controlling the density distribution of low-density porous polymer hollow spherical shells and helps to predict gel structures developed in confined geometries.
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Vetter, Philipp, Susan J. Goodbody e Daniel M. Wolpert. "Evidence for an Eye-Centered Spherical Representation of the Visuomotor Map". Journal of Neurophysiology 81, n. 2 (1 febbraio 1999): 935–39. http://dx.doi.org/10.1152/jn.1999.81.2.935.

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Evidence for an eye-centered spherical representation of the visuomotor map. During visually guided movement, visual coordinates of target location must be transformed into coordinates appropriate for movement. To investigate the representation of this visuomotor coordinate transformation, we examined changes in pointing behavior induced by a local visuomotor remapping. The visual feedback of finger position was limited to one location within the workspace, at which a discrepancy was introduced between the actual and visually perceived finger position. This remapping induced a change in pointing that extended over the entire workspace and was best captured by a spherical coordinate system centered near the eyes.
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Ming-zhi, Liu, Shen Yu-ru, Liu Jun e Na Bai. "Mechanical analysis of orbit tracking movement of feed system in large spherical radio-telescope". Applied Mathematics and Mechanics 26, n. 9 (settembre 2005): 1197–203. http://dx.doi.org/10.1007/bf02507730.

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Toyama, Shigeki. "Spherical Ultrasonic Motor for Pipe Inspection Robot". Applied Mechanics and Materials 186 (giugno 2012): 3–11. http://dx.doi.org/10.4028/www.scientific.net/amm.186.3.

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We present a pipe inspection robot using a newly developed spherical ultrasonic motor (SUSM) as a camera actuator. The novel SUSM has improved the range of movement compared to previous SUSMs, and the robot can point a camera in any direction. In this study, we determined a method for controlling the rotational direction and strategic control from the kinematics and characteristics of ultrasonic motors. The rotational directions were defined by the phase differences of the applied voltages, and the rotational speeds were changed with the frequencies. Additionally, we developed a very small position sensing system using rotary potentiometers. In the control experiment performed using the sensing system, the SUSM showed the returnability to the default position from several specified points, within an accuracy of 1°.
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Komarov, S. S., N. I. Miskaktin e N. Yu Tsvileneva. "Landing of descent objects with a closed spherical pneumatic shock absorber". Proceedings of the Mavlyutov Institute of Mechanics 3 (2003): 60–71. http://dx.doi.org/10.21662/uim2003.1.004.

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The landing of the landing object with a closed pneumatic shock absorber is considered. A mathematical model of planting the ”object–pneumatic shock absorber“ system is being constructed. Nonlinear boundary conditions in the sealing of the pneumatic shock absorber on the body of the landing object and in the area of interaction with the screen in the power structures in the ”object–pneumatic shock absorber“ movement system.
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Bai, Jie, e Jian Jun Dang. "Design and Analysis of a New Type of Spherical Robot". Applied Mechanics and Materials 556-562 (maggio 2014): 2414–17. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.2414.

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A new type of spherical robot based on the concept of changing the barycenter of the system is presented. The robot is consist of a shell and inner driving unit inside. The driving motor can provide the torque to move forward and backward, and the other motor can control the movement of a slider which is used to change the barycenter when turning the direction. The whole system is easy to design and the plate inside can be installed with certain sensor for special tasks. The dynamic model of the robot is introduced. The simulation results which shows the accordance with the experiment is presented.
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Vashchilina, O. V., I. V. Lebedyeva e O. I. Bilobrytska. "Modeling and numerical research of the self-excitation phenomenon of the drill bit whirlings vibrations". Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, n. 1 (2019): 28–33. http://dx.doi.org/10.17721/1812-5409.2019/1.5.

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In the paper an initial stage of a rotating drill string bit whirl motion proceeding on a well bottom surface is studied on the basis of nonholonomic kinematic models of mechanic interaction between the contacting uneven bodies. It is assumed that the drill bit is an absolutely rigid spherical body, the well bottom surface is spherical too. It is supposed that the system coaxiality is disturbed through small initial curvature of the drill string, defects of the bit and bore-well geometry or the debalance of the system mass. Linearized equations of the drill bit movement are derived, the frequencies of periodic motions are calculated, and their types are constructed for different geometric parameters of the spherical bits. It is shown that, depending on the system properties, the drill bit motion can to transit to the state of stationary spinning relative to an immovable center of velocities or acquire the regimes of forward and backward whirlings.
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He, Zhenqiang, Tong Wang, Xiaolong Wang, Shang Lu, Huachang Liu, Xiao Li, Lingling Men et al. "A new laser-based monitoring method for the cryomodule components alignment". Measurement Science and Technology 33, n. 7 (21 aprile 2022): 075201. http://dx.doi.org/10.1088/1361-6501/ac656b.

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Abstract Alignment of superconducting cavities is one of the important issues for the China Spallation Neutron Source Phase II (CSNS II) linac. In order to obtain the cavity displacement in the process of cooling down to the liquid helium temperature, a laser-based Poisson Spot Monitor (PSM) system was newly proposed and a verification system in the laboratory was built. The PSM system uses the diffraction spot formed on the CMOS camera after a beam of parallel laser passes through a spherical target to monitor the position of the measured object, where the spherical target is fixed on the monitored object. The displacement during the cooling process of the cryomodule is replaced by the movement of the high-precision two-axis motorized translation stage. A spherical target is fixed on the translation stage as the monitoring object. A beam of parallel laser passes through the spherical monitoring target to form a Poisson spot image on a CMOS camera. The coordinates of the Poisson spot center are obtained through image processing. Through experiments, the PSM system obtained a high accuracy within 5 μm, which meets the displacement monitoring requirement of the CSNS II cryomodule components. The system is fairly simple and able to be constructed without highly specialized parts and can also be used in other high-precision alignment and monitoring fields.
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Tesi sul tema "System of spherical movement"

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Zhang, Pu. "Simulations of nonlinear flow in spherical system". Thesis, University of Exeter, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248176.

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Noundjeu, Pierre. "The Einstein-Vlasov-Maxwell system with spherical symmetry". [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974828629.

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Pixton, Bruce. "Spherical Aberration Gauge for the Human Visual System". Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194351.

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Spherical aberration limits the ability of a human eye to form a clear image. The amount of Spherical Aberration found in a given eye is different across a population and is actively changing as a function of accommodation, light level, and age. Any attempt made to correct spherical aberration will need to have an accurate understanding of what the appropriate correction should be. Objective measurement of the Spherical Aberration inherent to the eye's optical systems helps to answer part of the question, but there are other factors in the human visual system, such as processing in the brain that affect what is "seen". Hence, a vision correction approach based purely on objective measurement of the eye's aberrations may not necessarily correspond to better vision. The Spherical Aberration Gauge has been developed to allow subjects to deter- mine for themselves the appropriate amount of correction required. The Gauge is designed to allow users to view an eye chart or scene while adjusting the amount of spherical aberration being introduced. It produces a wide range of spherical aberration levels from which a user can determine a single level that provides best vision. The amount selected by the user is considered a subjective spherical aberration correction and can then be applied to standard vision correction devices or procedures. This project attempts to bridge the gap between what is known about ocular spherical aberration and how the brain interprets the correction. The outcome of this project is to provide a tool that identifies the preferred amounts of spherical aberration correction and that gives insight from subjective feedback on the visual benefit thereof.
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Garrett, Travis Marshall Evans Charles Ross. "Simulating binary inspirals in a corotating spherical coordinate system". Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,1112.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2007.
Title from electronic title page (viewed Mar. 27, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Physics and Astronomy." Discipline: Physics and Astronomy; Department/School: Physics and Astronomy.
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Uddin-Al-Hasan, Main. "Real-time Embedded Panoramic Imaging for Spherical Camera System". Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2518.

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Panoramas or stitched images are used in topographical mapping, panoramic 3D reconstruction, deep space exploration image processing, medical image processing, multimedia broadcasting, system automation, photography and other numerous fields. Generating real-time panoramic images in small embedded computer is of particular importance being lighter, smaller and mobile imaging system. Moreover, this type of lightweight panoramic imaging system is used for different types of industrial or home inspection. A real-time handheld panorama imaging system is developed using embedded real-time Linux as software module and Gumstix Overo and PandaBoard ES as hardware module. The proposed algorithm takes 62.6602 milliseconds to generate a panorama frame from three images using a homography matrix. Hence, the proposed algorithm is capable of generating panorama video with 15.95909365 frames per second. However, the algorithm is capable to be much speedier with more optimal homography matrix. During the development, Ångström Linux and Ubuntu Linux are used as the operating system with Gumstix Overo and PandaBoard ES respectively. The real-time kernel patch is used to configure the non-real-time Linux distribution for real-time operation. The serial communication software tools C-Kermit, Minicom are used for terminal emulation between development computer and small embedded computer. The software framework of the system consist UVC driver, V4L/V4L2 API, OpenCV API, FFMPEG API, GStreamer, x264, Cmake, Make software packages. The software framework of the system also consist stitching algorithm that has been adopted from available stitching methods with necessary modification. Our proposed stitching process automatically finds out motion model of the Spherical camera system and saves the matrix in a look file. The extracted homography matrix is then read from look file and used to generate real-time panorama image. The developed system generates real-time 180° view panorama image from a spherical camera system. Beside, a test environment is also developed to experiment calibration and real-time stitching with different image parameters. It is able to take images with different resolutions as input and produce high quality real-time panorama image. The QT framework is used to develop a multifunctional standalone software that has functions for displaying real-time process algorithm performance in real-time through data visualization, camera system calibration and other stitching options. The software runs both in Linux and Windows. Moreover, the system has been also realized as a prototype to develop a chimney inspection system for a local company.
Main Uddin-Al-Hasan, E-mail: main.hasan@gmail.com
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Papalia, John M. "Self-ordering of spherical nanoparticles in a block copolymer system". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 192 p, 2007. http://proquest.umi.com/pqdlink?did=1251906361&Fmt=7&clientId=79356&RQT=309&VName=PQD.

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SANTOS, RONALDO VITORINO DOS. "MODELING OF A THERMAL STORAGE SYSTEM WITH SPHERICAL ENCAPSULATED MATERIAL". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=26927@1.

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O propósito deste trabalho é a modelagem de um sistema de termoacumulação utilizando cápsulas esféricas com material de mudança de fase (MMF) o programa computacional desenvolvido utilizado, foi à plataforma Matlab. O ponto principal do presente trabalho, no seu inédito modelo, está no fato de se estudar este sistema utilizando diferentes dimensões de esferas em único tanque de estocagem (Usualmente a termoamulação em cápsulas esféricas utiliza no interior do tanque cápsulas esféricas com um único diâmetro). Para formar o gelo (calor latente) nas cápsulas, um fluido com temperatura abaixo da temperatura de congelamento da água escoa em regime permanente através das cápsulas. Desta forma há uma troca de calor entre o fluido e as cápsulas com MMF (neste caso água). O ideal seria que toda água no interior das cápsulas se tornasse gelo. Porém, a resistência térmica formada pelo gelo começa a interferir na formação total da água no interior da cápsula. Outro problema é a temperatura do fluido que circula. Com o decorrer do escoamento a temperatura do fluido aumenta ao trocar calor com as cápsulas. Desta forma, as esferas em planos diferentes irão receber um fluido com uma temperatura maior que do plano anterior. Assim o gradiente de temperatura entre o fluido e a água fica cada vez menor influenciando o tempo de formação de gelo em todas as cápsulas. O estudo deste processo de termoacumulação prevê um tempo menor de circulação de fluido para formação de gelo e melhor uso da energia estocada.
The study and use of thermal storage has increased in recent years due to the need to reduce production cost. The purpose of this paper is the modeling of a thermal storage system using spherical capsules with phase change material (water). The main point of the present work lies in the fact that the this system uses different sizes of balls in a single storage tank (usually, in thermal storage spherical capsules systems spherical capsules with a simple diameter only is employed). To form the ice caps, a fluid, with a temperature below the freezing temperature of water, flows permanently through the capsules, so there is an exchange of heat between the fluid and the capsules with water, which freezer. Ideally, all water inside the capsule should become ice, but the thermal resistance posed by the ice begins to interfere with the formation of the total water within the capsule. Another problem is the temperature of the fluid that exchanges heat with the water capsules. As the fluid temperature increases, downstream, time of ice formation is affected by the smaller temperature difference between fluid and capsule external wall.
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Plemper, B. "A system dynamics interpretation of groundwater movement". Thesis, University of Sunderland, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414857.

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Fogg, Erica J. "An inertial sensor system for analysing human movement". Thesis, University of Bath, 2006. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428432.

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Calikoglu, Melih Rustu. "Transformation Of The Caste System And The Dalit Movement". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606141/index.pdf.

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This thesis analyzes the history of caste system and explains the theories of the birth of caste in Indian civilization. After defining the caste system in historical and cultural manner. examines the birth of and spreading of Dalit movement or low caste mass movement during the 19th and 20th century with the influence of British rule.
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Libri sul tema "System of spherical movement"

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Fulton, Loretta Gail. A human movement animation system. [s.l: The Author], 1995.

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FEDERAL AVIATION ADMINISTRATION. Surface movement guidance and control system. [Washington, D.C.]: U.S. Dept. of Transportation, Federal Aviation Administration, 1996.

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Movement: The muscular and skeletal system. New York: Dillon Press, 1993.

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Ward, Brian. The skeleton and movement. London: Watts, 1988.

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The sapiens system: The illuminati conspiracy. Phoenix, Ariz., U.S.A: Falcon Press, 1987.

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Labanotation: The system of analyzing and recording movement. 4a ed. New York: Routledge, 2005.

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The neuroscience of human movement. St. Louis: Mosby, 1998.

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Ferrell, William R., e Uwe Proske. Neural control of movement. New York: Springer Science+Business Media, LLC, 1995.

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Derek, Field, e Soames Roger, a cura di. Anatomy and human movement: Structure and function. Oxford [England]: Heinemann Medical Books, 1989.

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Derek, Field, e Soames Roger, a cura di. Anatomy and human movement: Structure and function. 5a ed. Edinburgh: Butterworth Heinmann/Elsevier, 2006.

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Capitoli di libri sul tema "System of spherical movement"

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Levin, Johannes, Sylvia Maaß, Madeleine Schuberth e Günter Höglinger. "Multiple System Atrophy". In Movement Disorders Curricula, 183–92. Vienna: Springer Vienna, 2017. http://dx.doi.org/10.1007/978-3-7091-1628-9_17.

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Voogd, J. "Anatomy of the oculomotor system". In Eye Movement Disorders, 3–17. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3317-0_1.

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Bower, James H. "Multiple System Atrophy". In Parkinson’s Disease and Movement Disorders, 235–42. Totowa, NJ: Humana Press, 2000. http://dx.doi.org/10.1007/978-1-59259-410-8_17.

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Hildebrandt, Ulrich. "Nutrition, Movement, and Environment". In Strategies for Sustainability of the Earth System, 295–306. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74458-8_19.

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Zheng, Chong Yu, e Jasmy Yunus. "Wearable Movement Analysis System for Children with Movement Disorders - Lower Extremities Assessment System". In IFMBE Proceedings, 395–98. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02913-9_101.

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Bois, Eric, e Sławomir Breiter. "Spherical Coordinates Perturbations for Small Eccentricity Orbits". In Interactions Between Physics and Dynamics of Solar System Bodies, 406. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1902-3_36.

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Veziroğlu, T. N. "Twenty Years of the Hydrogen Movement: 1974–1994". In Hydrogen Energy System, 1–14. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0111-0_1.

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Dare, Peter, e Brian Whiting. "Optimising the Movement of GPS Receivers". In Global Positioning System: An Overview, 248–53. New York, NY: Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4615-7111-7_23.

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Marcus, Elliott M., e Stanley Jacobson. "Motor System III: Cerebellum and Movement". In Integrated Neuroscience, 457–78. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-1077-2_20.

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Triggs, Lynne Newton, e Jean Rogers. "The Musculoskeletal System and Human Movement". In Orthopaedic and trauma nursing, 27–47. Chichester, UK: John Wiley & Sons, Ltd., 2014. http://dx.doi.org/10.1002/9781118941263.ch4.

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Atti di convegni sul tema "System of spherical movement"

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Saito, Kota, e Tomoharu Nagao. "A Self-Organizing Method Using Data Movement on Spherical Surface". In 2013 IEEE International Conference on Systems, Man and Cybernetics (SMC 2013). IEEE, 2013. http://dx.doi.org/10.1109/smc.2013.207.

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Song, Minghao, Pengtao Wang e Hongwei Sun. "Control of Non-Spherical Particles in Microfluidic Channel". In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68111.

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A precise control of orientation and position of micro- and nano-particles is critical for their applications in micro- and nano-scale systems. This research is focused on a numerical investigation of controlling the cylindrical particle/road with transverse electric field in a pressure driven microchannel flow with Finite Element Method (FEM). The particle/rod is initially located at the channel centerline with different initial angles. The electrophoretic force and hydrodynamic force are combined to control particle/rod movement. It was found that pressure, applied voltage and initial angles have different impact on particles dynamic behavior.
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Soh, Gim Song, e J. Michael McCarthy. "Five Position Synthesis of Spherical (6, 7) Linkages". In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49889.

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This paper presents a geometric synthesis procedure for spherical (6, 7) linkages, often known as spherical six-bar linkages, based on adding two spherical RR constraints to a spherical 3R serial chain. The design can use the spherical 3R chain to shape the movement of the linkage and identify a set of task positions that shape the trajectory of the end-effector. We use five task positions to completely specify the two RR chains that constrain the system to one degree-of-freedom. This procedure yields spherical versions of the various topologies for the planar Watt and Stephenson six-bar linkages. We find that for any design problem we obtain at a minimum of two design candidates for the Watt-type linkage, and as many as 185 different design for all of the topologies obtained by constraining the spherical 3R chain. Wampler’s method for the analysis of spherical loops is used to analyze these linkages. An example design is presented in detail.
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Chen, Lee-Huang, Kyunam Kim, Ellande Tang, Kevin Li, Richard House, Alice M. Agogino, Adrian Agogino, Vytas Sunspiral e Erik Jung. "Soft Spherical Tensegrity Robot Design Using Rod-Centered Actuation and Control". In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-60550.

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This paper presents the design, analysis and testing of a fully actuated modular spherical tensegrity robot for co-robotic and space exploration applications. Robots built from tensegrity structures (composed of pure tensile and compression elements) have many potential benefits including high robustness through redundancy, many degrees of freedom in movement and flexible design. However to fully take advantage of these properties a significant fraction of the tensile elements should be active, leading to a potential increase in complexity, messy cable and power routing systems and increased design difficulty. Here we describe an elegant solution to a fully actuated tensegrity robot: The TT-3 (version 3) tensegrity robot, developed at UC Berkeley, in collaboration with NASA Ames, is a lightweight, low cost, modular, and rapidly prototyped spherical tensegrity robot. This robot is based on a ball-shaped six-bar tensegrity structure and features a unique modular rod-centered distributed actuation and control architecture. This paper presents the novel mechanism design, architecture and simulations of TT-3, the first untethered, fully actuated cable-driven six-bar tensegrity spherical robot ever built and tested for mobility. Furthermore, this paper discusses the controls and preliminary testing performed to observe the system’s behavior and performance.
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Nishizawa, Hiroshi, Satoshi Fujita e Osamu Furuya. "A Dynamic Position Measurement Method for Destructive Process of Structures Using Image Processing". In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2918.

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In order to clarify the destruction mechanism of large structures in large seismic movements, a non-contacting displacement measurement system with a three-dimensional dynamic position with high precision is required. We have developed a three-dimensional measuring system with image processing using optical motion capture technology. This system consists of light emitting markers installed on the object structure and plural high speed cameras which obtain images of markers’ movement simultaneously, to measure the dynamic position of the three dimensional spatial coordinates of the markers. In order to measure the dynamic position with high precision, we have ever developed sub-pixel processing method which is able to measure very small displacements of the markers by analyzing the luminance distribution. Moreover, we have developed a new marker of spherical surface emission type which formed the luminance profile to improve furthermore the accuracy in rotational movement. Shaking tests were carried out with this measuring system and the results indicated that this system using new markers had sufficient accuracy within errors of a few millimeters in the structure of a 4 meter cube. Consequently, we have acquired the potential to apply to the measurement to the 3-D Full Scale Earthquake Testing Facility (E-Defense).
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Wegner, Stephan, Stefan Gels, Dal Sik Jang e Hubertus Murrenhoff. "Experimental Investigation of the Cylinder Block Movement in an Axial Piston Machine". In ASME/BATH 2015 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fpmc2015-9529.

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The greatest share of hydromechanic and volumetric losses in axial piston machines are produced within the tribological interfaces piston / cylinder, cylinder block / valve plate and slipper / swash plate. Hydrostatic and hydrodynamic effects are used to minimise the sum of solid friction, viscous friction and throttle losses. Other tribological interfaces have minor influence on efficiency losses in most operating points in machines of this type. This paper focuses on experimental investigations with the objective to acquire further knowledge on the cylinder block / valve plate contact. The investigations are part of a project funded by the German Research Foundation in which experimental and simulative investigations are combined to identify the effects influencing this tribological interface. The experiments focus on the multi-directional movement of the cylinder block and the friction torque within the contact. Therefore a test rig was built, capable of measuring the cylinder block movement in all degrees of freedom and the friction torque between both parts. A sensor system is built around a standard rotary group of an axial piston pump with a spherical cylinder block / valve plate contact. The pump functionality is maintained and measurements under standard operating conditions up to 30 MPa are possible. Procedures of the design process and descriptions of the measuring system are presented, followed by results of the cylinder block movement measurement, comparing the behavior under different pressure levels and speeds.
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Liu, Xiaohan, e Ni Mo. "The Study and Development of Excitation Source for Sensors of the AMB System in HTGR". In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30920.

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The High Temperature Gas-Cooled Reactor (HTGR) is developed widespread in the world nowadays. The helium turbine of the 10 MW high temperature gas-cooled test module reactor with the core made of spherical fuel elements is under research at the Institute of Nuclear and New Energy Technology of Tsinghua University in China. Magnetic bearings are widely applied in HTGR, where the rotating machineries are running under highly pure helium environment. Compared with conventional bearings, Active Magnetic Bearings (AMBs) possess several attractive advantages, such as contact-free, no-lubricating and active damping vibration. The sensors are the key components of the AMBs system and are responsible for measuring the position and movement of the rotor, the operating temperature and so on. In order to operate the sensors successfully, a stable and efficient excitation source is needed. The conventional excitation source, which is equivalent to the class AB power amplifier circuit, is inefficient and unstable in the previous experiment, and therefore a new source using class D power amplifier is under research and development. The paper will present the design, simulation and test of the new excitation source for the sensors of the AMBs system.
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Song, Minghao, e Hongwei Sun. "Simulation and Experimental Research for Microparticles in Microchannels With Dielectrophoretic Field-Flow Fractionation". In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39133.

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The Dielectrophoretic Field-flow Fractionation (DEP-FFF) is a very promising separation technique for particles and biological molecules. To further explore this technology, we conducted a computational and experimental investigation of a single particle movement in a PDMS microfluidic channel under DEP force, where both electrokinetic effects and particle hydrodynamics are considered. The model was first validated with dipole moment theory, and a polystyrene particle (∼10 μm) behavior in a non-uniform electric field created by a pair of non-symmetrical electrodes was then studied numerically. The simulation results were compared with experimental results and a good agreement was obtained. Further research is underway to study the behavior of non-spherical particles (such as nanowire, nanorod, and nanofiber) in other microfluidic systems.
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Kulkarni, Sudhir, Saurabh Tonapi, Pierre Larochelle e Kunal Mitra. "Effect of Tracking Flat Reflector Using Novel Auxiliary Drive Mechanism on the Performance of Stationary Photovoltaic Module". In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42973.

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General ways of cost reduction in solar power generation are Solar Tracked Photovoltaic (PV) arrays and concentrator systems. The PV array tracking becomes infeasible with increase in the size of the array and concentrated system is ineffective for continuous power generation as it requires external cooling system. Proposed approach here is to employ a novel auxiliary mirror drive mechanism to track the sun and reflect the rays on to stationary PV arrays. The performance is compared with same PV module without reflector under the same environmental conditions. Solarex SX 38 PV module and cleardome solar reflector (96% reflectivity) are used for the experiments. PV module is connected to electrical load through Maximum Power Point Tracker (MPPT) and data acquisition system for voltage and current measurements. Incident radiation is measured using Li-Cor pyranometers located on the plane of the module and horizontal plane. A shadow band device is used for the measurement of diffuse solar radiation. The PV module is placed facing south at a tilt angle equal to the latitude angle. A reflector is placed facing north and oriented using the novel Mirror Positioning Device (MPD). The MPD is a five bar spherical mechanism used for solar tracking. This mechanism has two degrees of freedom which allows for tracking the sun along its azimuth and altitude. The mechanism is driven by two servo motors which actuate two links. The actuated link 1 helps in achieving the altitude gained by the sun while the actuated link 2 helps to attain the azimuth (or horizontal movement). The reason for using a spherical mechanism is due to the virtue of its architecture; it allows for carrying a larger payload and also helps in reducing weight. Its advantages are that it requires less power than traditional PV array tracking; there is no need for sensors to determine the position of the sun and also that it being a two degree of freedom spherical mechanism yields a large singularity free mirror orienting workspace. Solar radiation, efficiency, and temperature are plotted as a function of time for analysis. Average diffuse solar radiation is found to be in the range of 15 to 20% of total solar radiation. Different experiments are performed to find out the optimum cycle speed for reflector. Measurements show that output from the PV panel can be increased in the order of 22% with the use of tracking reflector. This work has succeeded in its goal in realization that the considerable increase in output power from PV modules can be achieved.
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Chara, Z., J. Dolansky e B. Kysela. "Saltation movement of large spherical particles". In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4992191.

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Rapporti di organizzazioni sul tema "System of spherical movement"

1

Levien, Mary. Freight Shuttle System: Cross-Border Movement of Goods. Office of Scientific and Technical Information (OSTI), maggio 2011. http://dx.doi.org/10.2172/1048877.

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Joseph, Michael A., Timothy J. Tonkovic, Robert J. Hanlon, Anna P. Martin, Danny O. Hatten, Mary A. Hubbell, Tamika S. Ali e Monica L. Noell. Health Care: Report on the DoD Patient Movement System. Fort Belvoir, VA: Defense Technical Information Center, luglio 2005. http://dx.doi.org/10.21236/ada436187.

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ETA TECHNOLOGIES INC MONTGOMERY AL. Study/Services Site Preparation Guide. Cargo Movement Operations System (CMOS). Fort Belvoir, VA: Defense Technical Information Center, settembre 1989. http://dx.doi.org/10.21236/ada213261.

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Evers, Kenneth, e Samuel R. Kuper. Next Generation Cargo Movement System Analysis, Volume 1. Transportation Research. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1998. http://dx.doi.org/10.21236/ada379139.

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Evers, Kenneth, e Samuel R. Kuper. Next Generation Cargo Movement System Analysis, Volume 2. Transportation Research Agenda. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1998. http://dx.doi.org/10.21236/ada379140.

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Hirofumi Ohashi e Steven R. Sherman. Tritium Movement and Accumulation in the NGNP System Interface and Hydrogen Plant. Office of Scientific and Technical Information (OSTI), giugno 2007. http://dx.doi.org/10.2172/919556.

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D.A. Gates, J.R. Ferron, M. Bell, T. Gibney, R. Johnson, R.J. Marsala, D. Mastrovito et al. Status of the Control System on the National Spherical Torus Experiment (NSTX). Office of Scientific and Technical Information (OSTI), agosto 2005. http://dx.doi.org/10.2172/842395.

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Yeo, G. M. Late Carboniferous Dextral Movement On the CobequidHollow Fault System, Nova Scotia : Evidence and Implications. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/120392.

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Smith, D. R., E. Mazzucato, W. Lee, H. K. Park, C. W. Domier e Luhmann, Jr., N. C. A Collective Scattering System for Measuring Electron Gyroscale Fluctuations on the National Spherical Torus Experiment. Office of Scientific and Technical Information (OSTI), febbraio 2009. http://dx.doi.org/10.2172/950697.

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Peterson, A. S., e Sholom G. Cohen. A Context Analysis of the Movement Control Domain for the Army Tactical Command and Control System (ATCCS). Fort Belvoir, VA: Defense Technical Information Center, aprile 1991. http://dx.doi.org/10.21236/ada248117.

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