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The redundant driving problem is an inherent phenomenon existing in a modular caterpillar robot. To limit the internal forces arising from the redundant driving, this paper proposes a joint torque control method, which is based on an assumption that there is only one active joint in the four-link mechanism driving the climbing gait. Except the active joint, the other three joints are all considered...
In order to verify the benefit of four links kinematical method, the mathematical model of four links kinematics is established. The kinematical parameters of passive joints can be calculated according to the rotation of active joint. Then the wall-climbing robot can climb the vertical wall through the coordinated rotation of active joint and passive joints. To testify the feasibility of the four...
Based on the modular concept, this paper presents two caterpillar robot prototypes which are inspired by two typical caterpillars: inchworm and pine caterpillar. The inchworm robot prototype features simplest kinematics and open chain architecture. Due to the fact that there is only one attachment module supporting the inchworm robot during crawling, we apply an unsymmetrical phase method (UPM) to...
The concept of a modular climbing caterpillar robot is inspired by the kinematics of the real caterpillar. Due to the fixed constraints between the suckers and wall, the gait of the caterpillar robot engages a changing kinematic chain which is from an open chain to a closed chain, and then to an open chain orderly. This paper investigates the joint control methods of the gait in detail. During the...
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