Underwater Walking Robot - Crabster CR200
The underwater walking robot named Crabster CR200 is developed by researchers at the Korean Institute of Ocean Science and Technology (KIOST). The task of the Crabster CR200 is to inspect the seabed structure and shipwrecks off the coast of Korea Peninsula. This summer the robot will explore wrecks despite the powerful surge of tidal current.
The CR200 has 6 legs for mechanical contact with seabed and like its biological cousins, the forward 2 legs also work as robotic arms for underwater manipulation. It can pick up objects and store them inside a frontal compartment. The Crabster is equipped with 10 optical cameras and a long-range scanning sonar which scans up to 200 m (650 ft) away, so the robot is able to perform the precise inspection and manipulation in a low visibility environment.
The CR200 endures the tidal current by controlling the posture of its body and legs. Researches used computer simulations to streamline the robot's main shell, that improves the stability:
The numerical simulations were performed for the evaluation of current loads acting on the CR200 with a variety of incident angles using ANSYS-CFX package. The Reynolds-averaged Navier-Stokes equations were solved to simulate the fluid flow around the CR200 to calculate forces and moments induced by incoming current with angles.
The robot is powered through an external power cable and it can operate under water for more than 24 hours.