Results 191 to 200 of about 5,630,477 (241)
An Active Knee–Ankle–Foot Orthosis With Torque‐Dense, Low‐Impedance Knee Actuation
Advanced Intelligent Systems, EarlyView.This article presents the simulation, design, and clinical validation of a robotic active KAFO with torque‐sensitive actuation. By passively and continuously adapting the transmission ratio in response to the knee torque, the torque‐sensitive actuator overcomes the tradeoff between torque, weight, and impedance observed in conventional robot actuators,
Brendon Ortolano +4 more
wiley +1 more source
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Journal of Robotic Systems, 2003
AbstractThis study in projective geometry reveals that the principle of duality applies to the screw. Here, the screw is demonstrated to be an element of a projective three‐dimensional space (P3), right alongside the line. Dual elements for the screw and line are also revealed (the nut and spline).
Michael Griffis +1 more
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AbstractThis study in projective geometry reveals that the principle of duality applies to the screw. Here, the screw is demonstrated to be an element of a projective three‐dimensional space (P3), right alongside the line. Dual elements for the screw and line are also revealed (the nut and spline).
Michael Griffis +1 more
openaire +1 more source
Journal of Mechanical Design, 1981
It is shown that, if one considers the “total freedom” of instantaneous motion, three distinct types of screw systems arise. Of these only the ones which maintain the kinematic constraints—the so-called reciprocal screw systems—have been studied before. This paper introduces and studies the two new types, which we name “repelling” and “contrary” screws.
M. S. Ohwovoriole, B. Roth
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It is shown that, if one considers the “total freedom” of instantaneous motion, three distinct types of screw systems arise. Of these only the ones which maintain the kinematic constraints—the so-called reciprocal screw systems—have been studied before. This paper introduces and studies the two new types, which we name “repelling” and “contrary” screws.
M. S. Ohwovoriole, B. Roth
openaire +1 more source
2004
Abstract Robots and Screw Theory describes the mathematical foundations, especially geometric, underlying the motions and force-transfers in robots. The principles developed in the book are used in the control of robots and in the design of their major moving parts.
Joseph K Davidson, Kenneth H Hunt
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Abstract Robots and Screw Theory describes the mathematical foundations, especially geometric, underlying the motions and force-transfers in robots. The principles developed in the book are used in the control of robots and in the design of their major moving parts.
Joseph K Davidson, Kenneth H Hunt
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2012
Screw theory is a powerful mathematical tool for the analysis of spatial mechanisms. A screw consists of two three-dimensional vectors. A screw can be used to denote the position and orientation of a spatial vector, the linear velocity and angular velocity of a rigid body, or a force and a couple, respectively.
Zhen Huang, Qinchuan Li, Huafeng Ding
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Screw theory is a powerful mathematical tool for the analysis of spatial mechanisms. A screw consists of two three-dimensional vectors. A screw can be used to denote the position and orientation of a spatial vector, the linear velocity and angular velocity of a rigid body, or a force and a couple, respectively.
Zhen Huang, Qinchuan Li, Huafeng Ding
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Screw Theory and Helicoidal Fields
Volume 1B: 25th Biennial Mechanisms Conference, 1998Abstract Chevallier [1991] regarded a screw as the geometric representation of a “helicoidal” field: i.e. a vector field with helicoidal properties. In this contribution, this identification is employed to develop a formal approach to systematically define “reduced acceleration state” and “reduced jerk state”.
Jaime Gallardo A., José María Rico M.
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Finite and Instantaneous Screw Theory
2020This chapter presents fundamental concepts, expressions, operations, and properties of FIS theory. Firstly, the finite screw in quasi-vector form and its composition operation, i.e., the screw triangle product, is derived from dual quaternion for the first time.
Tao Sun, Shuofei Yang, Binbin Lian
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An Overview of the Theory of Screws
2016Screw theory refers to the algebra and calculus of six-dimensional entities formed with ordered pairs of three-dimensional vectors related by a reference point, as forces and moments as well as angular and linear velocities concerned with the kinematics and dynamics of a rigid body.
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A Note on the Theories of Screw Propulsion
Aeronautical journal (London, England : 1897), 1920The object of this note is to draw attention to a misconception of the theory of screw propulsion which appears in much good work now being done.This misconception lies in the combination of the Froude inflow theory and the Drzewiecki blade element theory used in conjunction with aerofoil characteristics obtained from tests in an air tunnel.To explain ...
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