Results 161 to 170 of about 2,061,051 (213)

The 1970s – A joint revolution

Journal of Orthopaedic Nursing, 2009
Summary This article considers how the nature of orthopaedics changed from a focus on immobilisation and nursing care to specialised surgery. Problems of infection and thromboembolism were already a matter for concern, which increased with the increase in technological interventions. This article considers the development of joint surgery in the 1970s
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Dynamic response of a revolute joint with clearance

Mechanism and Machine Theory, 1996
The response of a revolute joint in a four-bar mechanism with a clearance is investigated. Motion of a rocker-arm pin at the ground connection is modelled using a Lagrangian approach. When the resulting equations of motion are solved numerically, they show non-linear dependence on both the size of the clearance and the coefficient of friction between ...
Jungkeun Rhee, Adnan Akay
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Preliminary design of a revolute to prismatic morphing compliant joint

Transactions of the Canadian Society for Mechanical Engineering, 2020
The reduction of weight and size of mechanisms are important and difficult challenges considering portability, energy efficiency, and simplicity of fabrication. One of the solutions to address these issues consists of mechanisms with variable topology for which the mobility of the output is a succession of several simpler elementary motions.
Nicolas Mouazé, Lionel Birglen
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A Mechatronic Testbed for Revolute-Joint Prototypes of a Manipulator

IEEE Transactions on Robotics, 2006
This paper describes the design and development of a mechatronic testbed facility which allows high-fidelity and low-cost testing of the joint prototypes of a manipulator in a highly flexible environment. The testbed system consists of a set of load motors whose shafts are connected to those of the joint prototypes through a set of torque transducers ...
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Parameter identification for joint elements in a revolute-joint detector manipulator

SPIE Proceedings, 2005
A revolute-joint robot is being developed for the spatial positioning of an x-ray detector at the Advanced Photon Source. Commercially available revolute-joint manipulators do not meet our size, positioning, or payload specifications. One idea being considered is the modification of a commercially available robot, with the goal of improving the ...
Curt Preissner, Deming Shu, Thomas J. Royston   +2 more
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Variable Stiff Revolute Joint for Compliant Robot

Volume 6: Design, Systems, and Complexity, 2021
Abstract Over the past decades industrial robot manipulators have expanded throughout the automation landscape with their high degree of repeatability and accuracy. For safety reasons these robots are not allowed to share their workspace along with humans, which limits the various tasks that can be performed by a human-robot ...
Manoj K. Sharma, Christopher Kitts
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The maximum reach of revolute jointed manipulators

Mechanism and Machine Theory, 1981
Abstract The maximum reach of a manipulator consisting of 3 or more revolute joints is achieved when the line connecting the hand to the base is made to intersect all the intermediate joint axes. By a one to one mapping, the working volume can be generated.
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Bounded error interpolates for manipulators with prismatic and revolute joints

Proceedings, 1989 International Conference on Robotics and Automation, 2003
An algorithm for interpolating workspace trajectories in the joint space of a manipulator having revolute and prismatic joints is described. This algorithm relies on bounds on the derivatives of the kinematic map of such a manipulator derived by the authors (ibid., vol.3, p.1744-9).
Greg Heinzinger, Brad E. Paden
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Study on dynamic responses of planar multibody systems with dry revolute clearance joint: Numerical and experimental approaches

Journal of Sound and Vibration, 2019
The main purpose of this work is to present a comprehensive methodology to study the dynamic responses of multibody dynamics with revolute clearance joint, which is based on an improved nonlinear impact force model and a modified friction force model.
Xupeng Wang, Geng Liu, Shangjun Ma, R. Tong   +3 more
semanticscholar   +1 more source

Modeling 3D revolute joint with clearance and contact stiffness

Nonlinear Dynamics, 2011
The clearances in the kinematic joints are due to deformations, wear, and manufacturing errors; the accurate modeling of these effects in multibody analysis is a complex issue but in many practical applications, it is mandatory to take into them into account in order to understand the actual behavior of mechanical systems.
BRUTTI, CARLO, Coglitore, G, VALENTINI, PIER PAOLO   +2 more
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