Novel Door-opening Method for Six-legged Robots Based on Only Force Sensing

Abstract

Current door-opening methods are mainly developed on tracked, wheeled and biped robots by applying multi-DOF manipulators and vision systems. However, door-opening methods for six-legged robots are seldom studied, especially using 0-DOF tools to operate and only force sensing to detect. A novel door-opening method for six-legged robots is developed and implemented to the six-parallel-legged robot. The kinematic model of the six-parallel-legged robot is established and the model of measuring the positional relationship between the robot and the door is proposed. The measurement model is completely based on only force sensing. The realtime trajectory planning method and the control strategy are designed. The trajectory planning method allows the maximum angle between the sagittal axis of the robot body and the normal line of the door plane to be 458. A 0-DOF tool mounted to the robot body is applied to operate. By integrating with the body, the tool has 6 DOFs and enough workspace to operate. The loose grasp achieved by the tool helps release the inner force in the tool. Experiments are carried out to validate the method. The results show that the method is effective and robust in opening doors wider than 1 m. This paper proposes a novel door-opening method for six-legged robots, which notably uses a 0-DOF tool and only force sensing to detect and open the door.

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Time-optimal trajectory planning method for six-legged robots under actuator constraints

“…The method is motivated by the process of modeling the forward kinematics of six-legged robots in O w - xyz . The forward kinematics of the robot (FKoR) in O w - xyz is based on the forward kinematics of single leg (FKoL) in O B - xyz 8 . When modeling FKoR, foot-tips of the supporting legs constitute the base fixed to the ground.…”

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