Robot

Abstract

A robot includes a mechanical arm that outputs power for an underwater operation, a first thruster, a second thruster, and a surface portion in which a dimple is formed. A shape of the surface portion is a shape formed in such a manner that a predetermined velocity of a relative water flow in water corresponds to a Reynolds number indicating a supercritical region regarding a change in drag coefficient. The surface portion includes a surface of each of a first frame, each control unit, a cover member, and the mechanical arm.

What is claimed is: 
     
         1 . A robot comprising:
 a power device configured to output power for an underwater operation; and   a surface portion in which a dimple is formed.   
     
     
         2 . The robot according to  claim 1 ,
 wherein a shape of the surface portion is a shape formed in such a manner that a predetermined velocity of a relative water flow in water corresponds to a Reynolds number indicating a supercritical region regarding a change in drag coefficient.   
     
     
         3 . The robot according to  claim 1 , comprising a main body portion, and an exposed portion exposed from the main body portion,
 wherein the surface portion includes a surface of each of the main body portion and the exposed portion.   
     
     
         4 . The robot according to  claim 3 ,
 wherein the exposed portion is a mechanical arm.   
     
     
         5 . The robot according to  claim 2 ,
 wherein a shape on a downstream side of a relative water flow out of the shape of the surface portion is a shape formed in such a manner that the predetermined velocity that is relatively smaller corresponds to the Reynolds number indicating the supercritical region as compared with a shape on an upstream side.   
     
     
         6 . The robot according to  claim 2 , wherein
 at least any one of a size of a peripheral edge portion forming the dimple or a depth of a surface forming the dimple is set according to a magnitude of the predetermined velocity, and   at least any one of a change in the size of the peripheral edge portion in an increasing tendency or a change in the depth in a decreasing tendency is set as the predetermined velocity corresponding to the Reynolds number indicating the supercritical region increases.   
     
     
         7 . The robot according to  claim 1 , comprising a buoyancy portion that generates buoyancy,
 wherein the surface portion includes a surface of the buoyancy portion.