Analysis of wear in a spherical joint

Tribology ◽  
1970 ◽  
Vol 3 (1) ◽  
pp. 58
Author(s):  
R.D. McLeish ◽  
J. Skovecki
Keyword(s):  
Spherical Joint

scholarly journals A Novel Method for the Micro-Clearance Measurement of a Precision Spherical Joint Based on a Spherical Differential Capacitive Sensor

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3366 ◽  
Author(s):  
Wen Wang ◽  
He Yang ◽  
Min Zhang ◽  
Zhanfeng Chen ◽  
Guang Shi ◽  
...  
Keyword(s):  
Capacitive Sensor ◽  
Differential Capacitance ◽  
Industrial Robots ◽  
Parallel Mechanisms ◽  
Spherical Joint ◽  
Compact Structure ◽  
Spacing Variation ◽  
Novel Method ◽  
The Mathematical Model ◽  
Fringe Effect

A spherical joint is a commonly used mechanical hinge with the advantages of compact structure and good flexibility, and it becomes a key component in many types of equipment, such as parallel mechanisms, industrial robots, and automobiles. Real-time detection of a precision spherical joint clearance is of great significance in analyzing the motion errors of mechanical systems and improving the transmission accuracy. This paper presents a novel method for the micro-clearance measurement with a spherical differential capacitive sensor (SDCS). First, the structure and layout of the spherical capacitive plates were designed according to the measuring principle of capacitive sensors with spacing variation. Then, the mathematical model for the spatial eccentric displacements of the ball and the differential capacitance was established. In addition, equipotential guard rings were used to attenuate the fringe effect on the measurement accuracy. Finally, a simulation with Ansoft Maxwell software was carried out to calculate the capacitance values of the spherical capacitors at different eccentric displacements. Simulation results indicated that the proposed method based on SDCS was feasible and effective for the micro-clearance measurement of the precision spherical joints with small eccentricity.

A Computer Simulation Study of Fusion Surgery and Artificial Disc Replacement on the Human Cervical Spine

2006 ◽  
Vol 326-328 ◽  
pp. 903-906
Author(s):  
Hyung Soo Ahn ◽  
Il Hyung Park ◽  
Denis DiAngelo
Keyword(s):  
Cervical Spine ◽  
Adjacent Segment ◽  
Artificial Disc ◽  
Spherical Joint ◽  
Rotational Stiffness ◽  
Computer Simulation Study ◽  
Fusion Surgery ◽  
Biomechanical Changes ◽  
Disc Level ◽  
Flexion And Extension

The biomechanical changes brought on by spine fusion and the artificial disc designs to restore physiologic motion were studied by using a cervical spine computer model. Fusion increased the motion compensation at the adjacent segment during flexion and extension. The global rotational stiffness and segmental disc forces were also increased after fusion. Among the three prosthetic disc designs, the PDD-III (5-DOF spherical joint in plane parallel with the C5-C6 disc level) maintained the normal motion and minimized load build up of adjacent segment.

Research on Measurement Modeling of Spherical Joint Rotation Angle Based on RBF–ELM Network

2021 ◽  
pp. 1-1
Author(s):  
Liangqiong Xia ◽  
Penghao Hu ◽  
Kunlong Ma ◽  
Long Yang
Keyword(s):  
Rotation Angle ◽  
Spherical Joint ◽  
Joint Rotation

Dynamic Response and Nonlinear Characteristics of Spatial Parallel Mechanism With Spherical Clearance Joint

2019 ◽  
Vol 14 (4) ◽  
Author(s):  
Chen Xiulong ◽  
Li Yuewen ◽  
Jia Yonghao
Keyword(s):  
Dynamic Response ◽  
Contact Force ◽  
Dynamic Equation ◽  
Parallel Mechanism ◽  
Joint Clearance ◽  
Spherical Joint ◽  
Nonlinear Characteristics ◽  
Clearance Joint ◽  
Spatial Parallel Mechanism ◽  
Moving Platform

Spherical joint is a type of common kinematic pair in spatial parallel mechanism. The existence of spherical joint clearance has many adverse effects on the mechanism. A method of forecasting the dynamic behaviors of spatial parallel mechanism with spherical clearance joint is proposed. The 4-UPS-UPU spatial parallel mechanism with spherical clearance is taken as the research object, the dynamic response, and nonlinear characteristics of the mechanism are studied. The kinematic model and the contact force model of the spherical clearance are established. The dynamic equation of the spatial parallel mechanism with spherical joint clearance is derived by Newton–Euler method. The above-mentioned dynamic equation is solved by using the ODE113 function that is based on a variable order numerical differential algorithm in matlab. The dynamic responses of moving platform with different clearance values are analyzed. The contact force and the center trajectory of the sphere at the spherical joint are obtained. In addition, the phase trajectory, Poincare map, and bifurcation diagram are analyzed, and the nonlinear characteristics of the spherical clearance joint and the moving platform are obtained. By comparing the results, such as the acceleration of moving platform and the contact force, with virtual prototype simulation, the correctness of the dynamic equation of the spatial parallel mechanism with spherical clearance joint and the analysis results are verified. The researches show that the change of clearance value has a great influence on the motion state of spherical clearance joint, and chaos phenomena appears in the clearance joint with the increase in the clearance value. And the impact phenomenon appears between the spherical joint elements, which makes the mechanism generated vibration.

scholarly journals Enhanced Stiffness Modeling and Identification Method for a Cable-Driven Spherical Joint Module

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 137875-137886
Author(s):  
Kaisheng Yang ◽  
Guilin Yang ◽  
Si-Lu Chen ◽  
Yi Wang ◽  
Wenjun Shen ◽  
...  
Keyword(s):  
Spherical Joint ◽  
Stiffness Modeling ◽  
Identification Method

A Spherical Joint Piston Design for High Speed Diesel Engines

1996 ◽  
Author(s):  
Paul D. Wiczynski ◽  
Siegfried Mielke ◽  
Richard Conrow
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Spherical Joint ◽  
High Speed Diesel

Some frictional effects in a spherical joint

1981 ◽  
Vol 17 (10) ◽  
pp. 911-915 ◽  
Author(s):  
Yu. P. Smirnov
Keyword(s):  
Spherical Joint ◽  
Frictional Effects

Passively Driven Redundant Spherical Joint With Very Large Range of Motion

2017 ◽  
Vol 9 (3) ◽  
Author(s):  
Louis-Thomas Schreiber ◽  
Clément Gosselin
Keyword(s):  
Range Of Motion ◽  
Tilt Angle ◽  
Active Component ◽  
Large Range ◽  
Kinematic Model ◽  
Static Model ◽  
Spherical Joint ◽  
Torsional Spring

This paper presents a novel passive redundant spherical joint with a very large range of motion. A kinematic model is first developed in order to provide a framework for the analysis. The principle of the redundant joint is then introduced. The proposed joint does not require any active component since the redundancy is passively handled using springs. A static model of the joint is developed in order to clearly demonstrate how all singularities or jamming configurations can be avoided. Two possible arrangements are presented, one using linear springs and one using a torsional spring. Finally, experimental prototypes are demonstrated that can attain a range of tilt angle of ±150 deg.

scholarly journals Concept And Design Of A Spherical Joint Mechanism For Service Robots

2018 ◽  
Vol 24 ◽  
pp. 74-79
Author(s):  
Tim Froehlich ◽  
Dr. Ulrich Reiser ◽  
Felix Meßmer ◽  
Prof. Dr.-Ing. Alexander Verl
Keyword(s):  
Service Robots ◽  
Spherical Joint ◽  
Joint Mechanism
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