Results 201 to 210 of about 154,215 (248)
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Plasticating single‐screw extrusion theory
Polymer Engineering & Science, 1971AbstractVarious solid conveying, melting, and metering theories developed for plasticating screw extrusions are reviewed. Some recommendations for improving the present melting theories are presented. It is pointed out that the overall performance of a screw extruder can be predicted only by combining the solid‐conveying, melting and metering theories ...
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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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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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2000
In this paper early studies in Screw Theory have been reviewed to show the historical evolution of knowledge on the general motion of rigid bodies. The study focuses on papers of the past century and on Giulio Mozzi, who published in 1763 a treatise that can be considered the first rigorous formulation and study of the screw motion.
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In this paper early studies in Screw Theory have been reviewed to show the historical evolution of knowledge on the general motion of rigid bodies. The study focuses on papers of the past century and on Giulio Mozzi, who published in 1763 a treatise that can be considered the first rigorous formulation and study of the screw motion.
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Screw dislocations and discrete elastic theory
Journal of Physics and Chemistry of Solids, 1959Abstract A simple model of a screw dislocation in a crystal lattice in which each atom interacts with its neighbors through Hooke's law forces is presented, and expressions for the displacement component and strain energy are obtained. Applications of the model to screw dislocations in alkali-halide crystals are discussed.
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Applying screw theory to robot dynamics
Journal of Applied Mathematics and Mechanics, 1991A conceptually simple approach is developed to describe rigid-body dynamics. A brief exposition of screw calculations is given, with the main emphasis on the geometrical and algebraic properties of these objects. It is shown how to describe the kinematics and dynamics of a completely rigid body using screw variables.
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STORM: Screw Theory Toolbox For Robot Manipulator and Mechanisms
2020 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2020Screw theory is a powerful mathematical tool for the kinematic analysis of mechanisms and has become a cornerstone of modern kinematics. Although screw theory has rooted itself as a core concept, there is a lack of generic software tools for visualization of the geometric pattern of the screw elements.
Keerthi Sagar Somenedi Rao. +3 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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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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Screw Theory and its Applications to Joint Motion Analysis
Journal of Biomechanics, 1985Skeletal joint kinematics has become an important part of biomechanical analysis. Many systems have been developed to measure the movements of a wide variety of joints[6]. The analytical procedures developed for these systems can be classified into three categories: 1) those which decompose the motion into coordinates which can be interpreted by
Steven Peterson, Arthur Erdman
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