The Experts below are selected from a list of 63 Experts worldwide ranked by ideXlab platform
W A Gruver - One of the best experts on this subject based on the ideXlab platform.
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influence of adjustable Frictional Moments on gait patterns of a prosthetic knee with controllable Moment
Systems Man and Cybernetics, 1995Co-Authors: Dewin Jin, Xiaoning Zhang, Lingjun Yao, Yuzhen Dong, W A GruverAbstract:A dynamic model of a human-prosthesis system for above-knee disabilities is established. Using computer simulation we investigate the effect of the Frictional Moment on the gait pattern in the swing phase. It is shown that good performance can be obtained when the Frictional Moment is adjustable over time. The authors have implemented a prototype prosthesis capable of achieving variable damping using an electrorheological (ER) fluid damper controlled by a microprocessor. This device has the ability to actively control the Frictional Moment thereby greatly improving the function of the prosthesis.
J. Papadopoulos - One of the best experts on this subject based on the ideXlab platform.
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Planar sliding with dry friction Part 1. Limit surface and Moment function
Wear, 1991Co-Authors: S. Goyal, Andy Ruina, J. PapadopoulosAbstract:Abstract We present two geometric descriptions of the net Frictional force and Moment between a rigid body and a planar surface on which it slides. The limit surface, from classical plasticity theory, is the surface in load space which bounds the set of all possible Frictional forces and Moments that can be sustained by the Frictional interface. Zhukovskii's Moment function (N.E. Zhukovskii, Collected Works, Vol. 1, Gostekhizdat, Moscow, 1948, pp. 339–354) is the net Frictional Moment about the body's instantaneous center of rotation as a function of its location. Both of these descriptions implicitly contain the full relation between slip motion and Frictional load. While Zhukovskii's Moment function applies only to ordinary isotropic Coulomb friction, the limit surface applies to a wider class of friction laws that includes, for example, contact mediated by massless rigid wheels. Both the limit surface and the Moment function can be used to deduce results concerning the motion of sliding rigid bodies.
Dewin Jin - One of the best experts on this subject based on the ideXlab platform.
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influence of adjustable Frictional Moments on gait patterns of a prosthetic knee with controllable Moment
Systems Man and Cybernetics, 1995Co-Authors: Dewin Jin, Xiaoning Zhang, Lingjun Yao, Yuzhen Dong, W A GruverAbstract:A dynamic model of a human-prosthesis system for above-knee disabilities is established. Using computer simulation we investigate the effect of the Frictional Moment on the gait pattern in the swing phase. It is shown that good performance can be obtained when the Frictional Moment is adjustable over time. The authors have implemented a prototype prosthesis capable of achieving variable damping using an electrorheological (ER) fluid damper controlled by a microprocessor. This device has the ability to actively control the Frictional Moment thereby greatly improving the function of the prosthesis.
M A Shangju - One of the best experts on this subject based on the ideXlab platform.
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the Frictional Moment and transmission efficiency of planetary roller screw
Journal of the Harbin Institute of Technology, 2013Co-Authors: M A ShangjuAbstract:The Frictional Moments are calculated respectively based on the Hertzian contact theory and the method of effective ball considering elastic hysteresis of material,spinning sliding of roller and viscosity of lubricating oil,and the influences of contact angle,helix angle and tooth number of roller thread on Frictional Moment are analyzed. Furthermore,a calculating model of transmission efficiency for planetary roller screw is developed and the relationships of between the screw rotational speed,structure parameters mentioned above and transmission efficiency are discussed. The results show that the Frictional Moment is principally generated by roller's spinning sliding. Increasing the rotational speed of screw leads to decreasing of the transmission efficiency and a higher axial load can increase the transmission efficiency at the same rotational speed of screw. A higher contact angle can decrease the Frictional Moment and increase the transmission efficiency. The helix angle has less influence on Frictional Moment and can improve the transmission efficiency. Besides,it is helpful to enhance the carrying capacity and reduce the total Frictional Moment by increasing the tooth number of the roller thread.
Xiaoning Zhang - One of the best experts on this subject based on the ideXlab platform.
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influence of adjustable Frictional Moments on gait patterns of a prosthetic knee with controllable Moment
Systems Man and Cybernetics, 1995Co-Authors: Dewin Jin, Xiaoning Zhang, Lingjun Yao, Yuzhen Dong, W A GruverAbstract:A dynamic model of a human-prosthesis system for above-knee disabilities is established. Using computer simulation we investigate the effect of the Frictional Moment on the gait pattern in the swing phase. It is shown that good performance can be obtained when the Frictional Moment is adjustable over time. The authors have implemented a prototype prosthesis capable of achieving variable damping using an electrorheological (ER) fluid damper controlled by a microprocessor. This device has the ability to actively control the Frictional Moment thereby greatly improving the function of the prosthesis.
