Background:
The parallel mechanism is widely used in motion simulators, parallel machine
tools, medical equipment and other fields. It has advantages of high rigidity, stable structure and high
carrying capacity. However, the control strategy and control method are difficult to study because of
the complexity of the parallel mechanism system.
Objective:
The purpose of this paper was to verify the dynamic model of a hydraulic driven 3-DOF
parallel mechanism and propose a compound control strategy to broaden the bandwidth of the control
system.
Methods:
The single rigid body dynamic model of the parallel mechanism was established by the Newton
Euler method. The feed forward control strategy based on joint space control with inverse kinematic
was designed to improve the bandwidth and control precision. The co-simulation method based
on MATLAB / SIMULINK and ADAMS was adopted to verify the dynamics and control strategy.
Results:
The bandwidth of each degree of freedom in the 3-DOF parallel mechanism was used to expand
about 10Hz and the amplitude error was controlled below 5%.
Conclusion:
Based on the designed dynamic model and composite control strategy, the controlled
accuracy of the parallel mechanism is improved and the bandwidth of the control system is broadened.
Furthermore, the improvements can be made in aspects of control accuracy and real-time performance
to compose more patents on parallel mechanisms.
Robust control strategy for improving the performance of a soft robotic link
