Abstract
6-DOF hydraulically driven parallel robot mainly consists of two systems: mechanical subsystem and hydraulic subsystem. These two subsystems can be modeled as multi-rigid body dynamics and hydraulic dynamics respectively. According to a bilateral coupling between the two subsystems, the integrated dynamic model of 6-DOF parallel robot is set up in operating-space. Through mapping operating-space dynamic model onto joint-space using jacobian transformation, joint-space model of 6-DOF parallel robot is derived. And interactions characteristics among the channels are analyzed when 6-DOF parallel robot is in several typical poses. The results show that strong couplings exist among channels in the whole workspace and such couplings vary along with the poses of 6-DOF parallel robot. And such couplings will influence the equivalent load inertia acting on each channel which will bring difficulties to 6-DOF parallel robot control.
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