A new concept and technologies of multi-legged underwater robot for high tidal current environment

In this paper, we present a new concept of multi-legged seabed robot for high tidal current environment. The robot moves on seabed by walking with 4 or 6 legs which is different moving mechanism from the existing underwater thrust system such as screw or Caterpillar. The main concept to endure the high current is utilization of hydrodynamic forces acting on the body and legs. The advantage of this concept is that the robot is able to have high stability in positioning as well as that the robot is less disturbs the seabed environment than other thrust system. In order to optimize the configuration of the leg with respect to tidal current, an optimization problem is formulated. And a simplified model of hydrostatic and hydrodynamic forces acting on the legs is presented. Presented model can be used for optimization of body and leg configurations, and for drag-optimal path planning of legs. Because the shape of leg is a main factor to the hydro dynamic forces, a design of slender leg is also presented in this paper.

[1]  Martin Buehler,et al.  Simulation of an underwater hexapod robot , 2009 .

[2]  Jun-Ho Oh,et al.  Experiments on vision guided docking of an autonomous underwater vehicle using one camera , 2009 .

[3]  Nilanjan Sarkar,et al.  Coordinated motion planning and control of autonomous underwater vehicle-manipulator systems subject to drag optimization , 2001 .

[4]  Michael Sfakiotakis,et al.  Review of fish swimming modes for aquatic locomotion , 1999 .

[5]  Bong-Huan Jun,et al.  Repetitive Periodic Motion Planning and Directional Drag Optimization of Underwater Articulated Robotic Arms , 2006 .

[6]  Jun-Ho Oh,et al.  Mechanical design of the humanoid robot platform, HUBO , 2007, Adv. Robotics.

[7]  S.M. Savaresi,et al.  Modeling, identification, and analysis of limit-cycling pitch and heave dynamics in an ROV , 2004, IEEE Journal of Oceanic Engineering.

[8]  Y. Imaizumi,et al.  Propulsion system with flexible/rigid oscillating fin , 1995 .

[9]  Bong-Huan Jun,et al.  Development of the AUV ‘ISiMI’ and a free running test in an Ocean Engineering Basin , 2009 .

[10]  H. Sakai,et al.  Design concept of a prototype amphibious walking robot for automated shore line survey work , 2004, Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600).

[11]  Bong-Huan Jun,et al.  Manipulability analysis of underwater robotic arms on ROV and application to task-oriented joint configuration , 2004, Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600).

[12]  G. Dudek,et al.  Gone swimmin' [seagoing robots] , 2006, IEEE Spectrum.