Results 201 to 210 of about 5,630,477 (241)
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Screw horsepower dependence on screw speed and size—theory and experiment
Polymer Engineering & Science, 1974AbstractWithin a normal operating range of extruders, it has been well established that the output increases nearly proportionally to the screw speed but the screw horsepower increases more than proportionally to the screw speed, making the screw HP difficult to predict.
Chan I. Chung +2 more
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Formal analysis of the kinematic Jacobian in screw theory
Formal Aspects of Computing, 2018Abstract As robotic systems flourish, reliability has become a topic of paramount importance in the human–robot relationship. The Jacobian matrix in screw theory underpins the design and optimization of robotic manipulators. Kernel properties of robotic manipulators, including dexterity and singularity, are characterized with the Jacobian ...
Shi, Zhiping +5 more
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Zero-offset calibration using a screw theory
2016 13th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI), 2016In this paper, we propose an algorithm to easily correct zero-offset in robotic manipulators by identifying screw information. The proposed algorithm improves the accuracy of the robot even if there may be errors in the other geometric parameters. To identify the screw information, the robot is made to create a circular trajectory by rotating a certain
Youngwoo Choi +3 more
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Dynamics of parallel manipulators by means of screw theory
Mechanism and Machine Theory, 2003zbMATH Open Web Interface contents unavailable due to conflicting licenses.
BERGAMASCO, Massimo +4 more
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Application of Screw Theory to Rigid Body Dynamics
Journal of Dynamic Systems, Measurement, and Control, 1992This paper applies screw theory to the dynamic analysis of a rigid body in general spatial motion. Particular emphasis is placed upon the geometric interpretation of the velocity screw, the momentum screw, and the force screw which provide valuable physical insight into the dynamic behavior of the rigid body. The geometric relation between the velocity
Pennock, G. R., Oncu, B. A.
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The Theory of screws incorporated in a new finite element
Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics, 2001The new finite element studied here is of triangular type and is used in sheet stamping simulation. The number of equilibrium equations is half that of known methods owing to an original displacement description. The new trianglular element does not use any nodal rotation, and only the translations are useful.
Sabourin, F, Fayet, M, Vives, M
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On the Use of Quaternions in the Theory of Screws
Proceedings of the Royal Society of Edinburgh, 19041. A quaternion r = Sr + Vr denotes the sum of a scalar and a vector, the former being an essentially undirected quantity. In many cases, however, and specially in the theory of screws, we have to deal with two co-directed quantities. In the usual notation, the components of a translation, λ, which are parallel to, and perpendicular to, a rotation, μ ...
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Gyrokinetic theory of the screw pinch
Physics of Fluids B: Plasma Physics, 1989The gyrokinetic differential equation for waves propagating in a hot collisionless current-carrying plasma is derived in cylindrical geometry. It is shown that the averaging of the wave electric field over the ion Larmor circle leads to a transcendental differential equation (d.e.) of infinite order in the radial derivative. This reduces to a d.e.
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A Theory of the Peierls Stress of a Screw Dislocation. II
Journal of the Physical Society of Japan, 1974The peierls stress of a screw dislocation in a simplified crystal model is given exactly. The stress oscillates strongly as the dislocation width increases.
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