The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform

Paul Milenkovic - One of the best experts on this subject based on the ideXlab platform.

  • Triangle Pseudocongruence in Constraint Singularity of Constant-Velocity Couplings
    Journal of Mechanisms and Robotics, 2009
    Co-Authors: Paul Milenkovic
    Abstract:

    Congruent triangles establish that a class of intersecting-shaft couplings is Constant Velocity. These mechanisms employ a pair of linkages in parallel: a spherical joint at the intersection of the shafts and the intersection of straight-line tracks away from the shaft center to transmit rotation. A proof of Constant Velocity follows from the congruence of an initial pair of triangles with two matching sides and one excluded angle. This side-side-angle (SSA) condition is a pseudocongruence because it allows two different values for the included angle, indicating that such shaft couplings have symmetric and skewed assembly configurations. If the other excluded angle happens to be 90 deg, the SSA condition guarantees congruence because there is a single solution for the included angle. The 90 deg condition, however, occurs at a posture with a constraint singularity, where the shaft coupling is unable to transmit torque. Motion screw analysis establishes the same geometric condition for a coupling based on a revolute-spherical-revolute Clemens linkage. An upper bound on shaft deflection imposed by hyperextension of that linkage, along with a bound on deflection where constraint singularity occurs, identifies couplings where the constraint singularity can occur within the physical limits.

Sun Yue-dong - One of the best experts on this subject based on the ideXlab platform.

Andreas A Polycarpou - One of the best experts on this subject based on the ideXlab platform.

  • a phenomenological friction model of tripod Constant Velocity cv joints
    Tribology International, 2010
    Co-Authors: Chul Hee Lee, Andreas A Polycarpou
    Abstract:

    Constant Velocity (CV) joints have been favored for automotive applications, compared to universal joints, due to their superiority of Constant Velocity torque transfer and plunging capability. High speed and sport utility vehicles with large joint articulation angles, demand lower plunging friction inside their CV joints to meet noise and vibration requirements, thus requiring a more thorough understanding of their internal friction characteristics. In this paper, a phenomenological CV joint friction model was developed to model the friction behavior of tripod CV joints by using an instrumented CV joint friction apparatus with tripod-type joint assemblies. Experiments were conduced under different operating conditions of oscillatory speeds, CV joint articulation angles, lubrication, and torque. The experimental data and physical parameters were used to develop a physics-based phenomenological CV joint dynamic friction model. It was found that the proposed friction model captures the experimental data well, and the model was used to predict the external generated axial force, which is the main source of force that causes vehicle vibration problems.

  • Development of an Apparatus to Investigate Friction Characteristics of Constant-Velocity Joints
    Tribology Transactions, 2005
    Co-Authors: Chul Hee Lee, Andreas A Polycarpou
    Abstract:

    Constant-Velocity (CV) joints have become standard design and an integral part of modern vehicles, primarily due to their superiority in terms of CV torque transfer. Despite widespread usage of Constant Velocity joints there are certain aspects of their friction, wear, and contact characteristics that are not well understood. In this article, the need to directly measure CV joint internal contact and friction forces is addressed by designing and constructing an instrumented advanced CV joint friction apparatus using actual tripod-type joint assemblies. The apparatus is capable of measuring key performance parameters such as friction and wear under different realistic operating conditions of oscillatory speeds and CV joint articulation angles. The apparatus incorporates a custom-installed triaxial force sensor inside of the CV joint to measure in situ internal CV joint forces (including friction). The CV joint apparatus is under full computer control and is communicating with all measurement components via...

Bogusław Radziszewski - One of the best experts on this subject based on the ideXlab platform.

  • Dynamics of impacts with a table moving with piecewise Constant Velocity
    Nonlinear Dynamics, 2009
    Co-Authors: Andrzej Okninski, Bogusław Radziszewski
    Abstract:

    Dynamics of a ball moving in gravitational field and colliding with a moving table is considered. The motion of the limiter is assumed as periodic with piecewise Constant Velocity. It is assumed that the table moves up with a Constant Velocity and then goes down with another Constant Velocity. The Poincare map describing evolution from an impact to the next impact is derived. Several classes of solutions are computed in analytical form.

Zhang Zhi-gang - One of the best experts on this subject based on the ideXlab platform.

  • Kinematic Analysis and Simulation on VL Telescopic Constant Velocity Universal Joint
    2012
    Co-Authors: Zhang Zhi-gang
    Abstract:

    The kinematic differential equations are formulated for centers of steel balls in a VL telescopic Constant Velocity universal joint,which can describe the motion of the steel balls,no matter how the motion between the input and the output shafts is.The kinematic traits of this type joint are analyzed and the kinematic analysis software is developed for VL telescopic Constant Velocity universal joint.Through the kinematic simulation,some important parameters are obtained,including the relative displacements of the steel ball centers with respect to the orbits and the maximum displacements with respect to the cage slot center in both of radial and tangential directions.These results are helpful in the design of orbit length and cage size of VL telescopic Constant Velocity universal joint.

  • Kinematic Analysis and Simulation of the Steel Balls for Rzeppa Constant Velocity Joint
    Journal of Mechanical Engineering, 2012
    Co-Authors: Zhang Zhi-gang
    Abstract:

    Steel balls are the most important components of Rzeppa Constant Velocity joint,and their kinematic traits play a vital role in the function of the joint.It's proved that the two orbits of the center of a steel ball on inner race and outer race definitely meet at a point under the constraints of these orbits,and the kinematic differential equations of the steel balls are formulated,based on which the rigorous proof of the Constant Velocity characteristic is presented.Relative displacements of the steel balls with respect to the inner race,the outer race and the cage are simulated with the motion of each steel ball.The obtained results demonstrate the common kinematic traits of the steel balls: all steel balls are distributed on a circle whose center is located at the center point of the line connecting the two centers of inner and outer orbits,and their in-plane orientation angular velocities are not equal to each other,but vary periodically in values around the input angular Velocity;the relative displacements of the steel balls with respect to the inner race and the outer race are equal in magnitude and opposite in direction;and a steel ball can move periodically with respect to the cage slot center in both radial and tangential directions.These results are helpful in the design of Rzeppa Constant Velocity joint.