Dynamics Modeling and Motion Control of an New Unmanned Underwater Vehicle

Abstract

The structure design of an autonomous/remote underwater vehicle, Intelligence Ocean I(IO-I), capable of operating in ROV or AUV mode and acquiring marine environment information and its own status data are outlined first in this paper. The dynamics equations of underwater vehicles in horizontal and vertical are given to describe the movement of an underwater vehicle, taking the gravity, buoyancy, thrust and hydrodynamic force into account. Furthermore, in order to realize high precision automatic control of robot, the fuzzy control algorithm which belongs to the intelligent control is combined with the cascade PID control algorithm to realize an modified underwater vehicle control algorithm, which improves the applicability of the control algorithm and reduces the difficulty and workload of parameter adjustment. The proposed control algorithm is recognized in numerical simulations as well as in experimental tests which confirm the good performance of the controller and the prototype.

Keywords

• Unmanned underwater vehicle
• dynamics modeling
• motion control
• PID controller