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In this paper, we describe a gait generation method for the crawling motion of a legged robot using Normalized Energy Stability Margin (NESM). The crawling motion is a method of locomotion that, since the robot is very close to a state of falling, its leg and torso are grounded alternately in order to enable the robot to move with a low center of gravity. It has the benefit of decreasing the impact...
This paper describes an approach that enables the four-limbed robot “WAREC-1” to climb up and down vertical ladders stably. First, the four-limbed robot “WAREC-1” is introduced and dynamic stability conditions in multi-mass model for ladder climbing are proposed as the basis of judging whether a four-limbed robot is stable or not while climbing a vertical ladder. According to the proposed stability...
This paper introduces a motion planning method to generate ladder climbing motion for a four-limbed robot. This method contains the following points: (1) independent planning of path and time in 3 dimensional space for trajectory planning; (2) path length minimization according to given midpoints. In trajectory planning, arc-length parameterization is used to separate path planning and time planning...
This paper describes a trajectory planning method of ladder climbing for a four-limbed robot. The overall design of the four-limbed robot and the specific design of its end-effector is explained. The trajectory planning consists of two components: path planning and time planning, and the separation of these two parts are realized by arc-length parameterization. In path planning, we use cubic spline...
Temperature dependence of electrical resistance of the organic superconductor, κ-(BEDT-TTF) 2 Cu(NCS) 2 is investigated up to 80 kbar. The resistance is metallic below room temperature above 15 kbar both parallel and perpendicular to the most conducting ab plane. Nonetheless, it has been found that the isothermal pressure dependence of the resistance shows upturn above 50 kbar.
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