Research Article

Dynamics Analysis of Spatial Parallel Mechanism with Irregular Spherical Joint Clearance

Table 1

System parameters.

Design parametersValue

Mass of the moving platform, (kg)37.48
Mass of the oscillating rod, (kg)25.96
Mass of the telescopic rod, (kg)8.45
Length of the oscillating rod, (m)0.76
Length of the telescopic rod, (m)0.88
Length from the oscillating rod of the center of mass to the hinge point of the fixed platform, (m)0.38
Length from the telescopic rod of the center of mass to the hinge point of the moving platform, (m)0.45
Radius of the sphere spherical joint with clearance, (m)0.015
Power exponent of the metal surface, n1.5
Coefficient of restitution, 0.9
Linear wear coefficient
Moment of inertia of the moving platform, (kg·m2)
Moment of inertia of the oscillating rod, (kg·m2)
Moment of inertia of the telescopic rod, (kg·m2)
Elastic modulus of the sphere and the ball sleeve, (GPa)200
Poisson’s ratio of the sphere and the ball sleeve, 0.3
The sliding friction coefficient, 0.05
Simulation step size0.001 s