Evaluation of ground slippery condition during walk of bipedal robot using MEMS slip sensor

This paper reports on a method to evaluate ground slippery condition using a MEMS slip sensor. The sensor discriminates between ground slippery and non-slippery conditions during walking motions of a bipedal robot, which enables the robot to prevent a slip. First, we evaluated the responses of the sensor pressed against an oiled or non-oiled surface. Then, we proposed a discriminating method between the oiled and non-oiled surfaces using the sensor. Finally, we demonstrated that a bipedal robot was able to evaluate the slippery condition of the ground where the foot of the robot landed during walk.