The problems of structure uncertainty, system dynamics coupling and ocean current interference in motion control of underwater vehicle-manipulator system (UVMS) are studied. A suitable coordinate system is established for the system, and the kinematics model of the system is obtained. According to the dynamic equation of vertical plane and the coupling effect between systems, the mathematical model of underactuated underwater vehicle in vertical plane is established. Aiming at the control of UVMS vertical plane attitude under operating conditions, an adaptive backstepping controller based on fuzzy is designed. The attitude control under different motion conditions is verified by simulation. The results show that the method in this paper can better make UVMS maintain a good control attitude under different motion conditions.
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