Results 41 to 50 of about 6,838,442 (240)

An Application of Screw Theory to the Jerk Analysis of a Two-Degrees-of-Freedom Parallel Wrist

Robotics, 2015
In this work the velocity, acceleration, and jerk analyses of a two-degrees-of-freedom parallel wrist are approached by means of the theory of screws. For the sake of completeness, the finite kinematics of the manipulator is also investigated.
Jaime Gallardo-Alvarado, Ramón Rodríguez-Castro, Martín Caudillo-Ramírez, Luciano Pérez-González   +3 more
doaj   +1 more source

Dislocation Kinks in Copper: Widths, Barriers, Effective Masses, and Quantum Tunneling [PDF]

, 2000
We calculate the widths, migration barriers, effective masses, and quantum tunneling rates of kinks and jogs in extended screw dislocations in copper, using an effective medium theory interatomic potential.
A. Hikata, A. Seeger, B. Joós, B. V. Petukhov, Christopher R. Myers, D. C. Ralph, Daniel C. Ralph, E.-J. Thompson, F. Kroupa, G. Schottky, G. Zárand, J. D. Eshelby, J. Lothe, J. P. Hirth, James P. Sethna, James P. Sethna, James P. Sethna, James P. Sethna, K. K. Mon, K. W. Jacobsen, K. W. Jacobsen, K. W. Jacobsen, L. B. Hovakimian, L. B. Hovakimian, O. P. Balkashin, P. Stoltze, R. C. Zeller, R. J. P. Keijsers, S. Coleman, S. K. Upadhyay, Siew-Ann Cheong, T. Kosugi, T. Vegge, Tejs Vegge, V. Narayanamurti, V. V. Pustovalov, V. V. Pustovalov, W. P. Su, W. P. Su, X. Liu   +39 more
core   +2 more sources

A novel solution of inverse kinematic for 6R robot manipulator with offset joint based on screw theory

, 2020
This article proposes a novel inverse kinematic approach with translation transformation matrix based on screw theory to solve the inverse kinematic problem for 6R robot manipulator with offset joint.
Zhiwei Liao, G. Jiang, Fei Zhao, X. Mei, Yang Yue   +4 more
semanticscholar   +1 more source

A Mathematical Modeling and Analysis Method for the Kinematics of a Maglev Train

Machines, 2022
In recent years, more and more countries are paying attention to maglev transportation because of its outstanding advantages. However, because the structure of a maglev train is more complex than a wheel-rail train, there is no systematic theory method ...
Mingxin Liu, Jie Li, Yuxin Jin, Peng Leng, Danfeng Zhou   +4 more
doaj   +1 more source

An elastoplastic theory of dislocations as a physical field theory with torsion

, 2002
We consider a static theory of dislocations with moment stress in an anisotropic or isotropic elastoplastical material as a T(3)-gauge theory. We obtain Yang-Mills type field equations which express the force and the moment equilibrium.
Abrikosov A A, Barut A O, Bilby B A, Cartan É, Edelen D G B, Edelen D G B, Eringen A C, Eshelby J D, Eshelby J D, Frankel T, Gairola B K D, Gairola B K D, Golebiewska-Lasota A A, Gronwald F, Gutkin M Yu, Hamermesh M, Hehl F W, Hehl F W, Hirth J P, Kadic A, Katanaev M O, Kondo K, Kosevich A M, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Marsden J E, Maugin G A, Nabarro F R N, Nye J F, Peierls R E, Puntigam R A, Rogula D, Schaefer H, Seeger A, Trautman A, Trautman A, Trebin H-R, Trzesowski A   +44 more
core   +1 more source

Accuracy and transferability of Gaussian approximation potential models for tungsten [PDF]

, 2014
We introduce interatomic potentials for tungsten in the bcc crystal phase and its defects within the Gaussian approximation potential framework, fitted to a database of first-principles density functional theory calculations.
Bartók, Albert P., Csányi, Gábor, Szlachta, Wojciech J.   +2 more
core   +1 more source

Vision-Based Hybrid Controller to Release a 4-DOF Parallel Robot from a Type II Singularity

Sensors, 2021
The high accuracy and dynamic performance of parallel robots (PRs) make them suitable to ensure safe operation in human–robot interaction. However, these advantages come at the expense of a reduced workspace and the possible appearance of type II ...
José L. Pulloquinga, Rafael J. Escarabajal, Jesús Ferrándiz, Marina Vallés, Vicente Mata, Mónica Urízar   +5 more
doaj   +1 more source

The gauge theory of dislocations: a nonuniformly moving screw dislocation

, 2010
We investigate the nonuniform motion of a straight screw dislocation in infinite media in the framework of the translational gauge theory of dislocations. The equations of motion are derived for an arbitrary moving screw dislocation.
Askes, Askes, Barton, Bopp, Brock, Edelen, Eringen, Eringen, Eshelby, Eshelby, Günther, Iwanenko, Kadić, Kiusalaas, Kiusalaas, Lardner, Lazar, Lazar, Lazar, Lazar, Markenscoff, Markenscoff, Markus Lazar, Mindlin, Mindlin, Mura, Mura, Nabarro, Podolsky, Rubakov, Wladimirow   +30 more
core   +1 more source

Dislocation constriction and cross-slip in Al and Ag: an ab initio study

, 2002
A novel model based on the Peierls framework of dislocations is developed. The new theory can deal with a dislocation spreading at more than one slip planes.
B. Joós, D.J.H. Cockayne, F.R.N. Nabarro, G. Lu, G. Lu, G. Lu, Gang Lu, J. Hartford, M.C. Payne, M.S. Duesbery, Nicholas Kioussis, S. Rao, T. Rasmussen, V.V. Bulatov, Vasily V. Bulatov, Y.M. Juan   +15 more
core   +1 more source

Improved screw theory using second order terms [PDF]

IEEE/RSJ International Conference on Intelligent Robots and System, 2003
The local displacement of an object is very useful for deciding grasp stability, generating trajectories, recognizing assembly tasks, and so on. To calculate this displacement, the screw theory is employed. It is equivalent to the first order Taylor expansion of the displacement.
J. Takamatsu, H. Kimura, K. Ikeuchi
openaire   +1 more source