|Tip-position/velocity Tracking Control of Manipulator for Hull Derusting and Spray Painting based on Active Disturbance Rejection Control
Zhong Wang, Xiaohong Jiao*, and Meiyu Feng
International Journal of Control, Automation, and Systems, vol. 16, no. 4, pp.1916-1926, 2018
Abstract : "During sandblasting and spray painting for hull, the tracking performance of the end-effector of manipulator
to the outer surface of the hull in uniform velocity is seriously affected by uncertainty of the electrohydraulic
actuator and deflection of the manipulator. To effectively improve the tracking performance of the tipposition/
velocity, a novel tracking control strategy is proposed, which is based on active disturbance rejection
control (ADRC) with extended state observer (ESO) and setting position feedforward control with deflection compensation.
First, to reduce tracking error caused by the deflection, the reference positions of two cylinders driving
telescopic and luffing motion are calculated with consideration of the deflection influence according to manipulator
geometry. And then, ADRC technique is adopted to design the position servo controller of the luffing/telescopic
cylinder with the help of the estimate for the uncertainty of the electro-hydraulic system by the ESO. The stability
of the whole closed-loop system and the convergence of tracking error are guaranteed theoretically, simultaneously,
simulation carried out in Matlab/Simulink environment with physical parameters of a real system demonstrates the
effectiveness and superiority of the proposed control strategy compared with existing control schemes. Furthermore,
the experimental result is given to show the feasibility and availability of the control method."
ADRC, defection, electro-hydraulic system, manipulator, tip-position tracking.
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