SummaryA small AUV "MR-X1" was developed in 2000 for detailed investigation of the seafloor and marine organisms at JAMSTEC (Japan Agency for Marine-Earth Science and Technology). In order to assure high maneuverability under low-speed cruising and good hovering performance, the motion of the vehicle is controlled by five thrusters.When the vehicle was built, PID control was implemented, but in order to improve control performance, renovation of the vehicle operating system has been ongoing since 2007, and a model based control (LQI control) is due to be adopted when this is complete.The paper summarizes the mathematical model of the vehicle and the design method of the motion and path controller, and shows successful numerical simulated results.
JAMSTEC has operated autonomous underwater vehicles (AUVs) for scientific survey of seabed mineral resources. Conventionally, it is difficult for one support vessel to track plural AUVs in one operation. However, it takes a long time for one AUV to survey a large target area. To solve this problem JAMSTEC has developed an autonomous surface vehicle (ASV) with MHI. The vehicle instead of the support vessel, autonomously tracks AUV(s) and monitors its progress, enabling the simultaneous operation of multiple AUVs and thereby the survey of a larger target area within a given period of time. An important role of the ASV is to relay underwater communication and aerial communication because the underwater communication range is very small. ASV tracks AUV autonomously to keep the acoustic communication, and send AUV information to the support vessel by using radio waves.
"YUMEIRUKA" is an AUV that Japan Agency for Marine-Earth Science and Technology (JAMSTEC) has developed and is operating. A seabed resource exploration is carried out by two-set simultaneous operation with AUV "JINBEI" developed by JAMSTEC. "YUMEIRUKA" towing a sensor cable, and the cable is oscillated by the AUV. The up-and-down oscillation of the sensor has a bad influence on the exploration result. Therefore, in order to perform accurate seabed resource exploration, it is necessary to comprehend the motion of the sensor cable and to optimize it. In this paper, motion simulations of a sensor cable towed by X rudder AUV "YUMEIRUKA" are shown.
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