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Compliant-motion control implementation on a humanoid robot with electrohydraulic joints is presented. Characterization results are shown, leading to a dynamic model used in feedback. A Natural Admittance Controller is designed, and its performance is demonstrated in demanding manipulation tasks, including dual-arm palmar manipulation of an egg and dual-arm valve turning.
Stable walking of bipedal humanoid is an crucial and challenge issue of research in bipedal robots. And the structure of shoe sole plays a significant role in preventing someone from slipping in human life. The humanoid robot foot often skid while the robot is walking fast, and it may cause serious harmfulness. This study presents some foot pads for humanoid robot to improve its stability and reliability...
Recently, many researchers have been studying methods for the stepless slip motion of humanoid robots. However, the control mechanism is not clear. In this paper, we propose a simple feedback control method for slip motion based on the forward and backward tilting of the body. We verified this control method by using a life-size humanoid dynamic simulator that was constructed with Open Dynamics Engine...
Manipulators with flexible joints are widely used as the space manipulators, whereas the elasticity of flexible joint leads to poor dynamic performance. To solve the influence of elasticity, the paper is to establish the model of flexible joint, identify the parameters, and design the controller. The off-line methods are applied to identify the current coefficient and the parameters of flexible joint...
In this paper, a wheel/track mobil platform for robot search and rescue such dangerous tasks is designed. Through the wheel/track transform mechanism, the wheel and track motion modes can be switched alternatively to adapt to different ground situations. The friction between the belt wheel and hub is used to drive the track and its guide wheel is the one of the transform mechanism. When the guide...
Gain tuning is very important in order to obtain good performances for implementing a controller. In this paper, three popular evolutionary algorithms are utilized to optimize the control gains of a position domain PID controller for the improvement of contour tracking for robotic manipulators. Differential Evolution (DE), Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) are used to optimize...
Several passive joints are usually needed in surgical robots to decrease the difficulty in doctors' operating, which can be manually rotated without motor pushing. When stopped at a specified position, passive joints should be locked until operation ends, and keep bearing torques. This paper is aimed to design a locking method used in minimally invasive surgical robot. Firstly choose the locking type...
In grasping, one fundamental question is to ask how well a grasp can resist external disturbance. Canonically, the solution of this question lies in calculating the set of wrenches that can be generated by the grasp assuming some limitation of the hand and measurement of the extreme point in some direction of that set. Using wrenches comes with two issues: the dependency on the choice of the origin...
In this paper, we report on our efforts to transport a large object by small mobile robots in a home or office environment. Given such an environment, robots must be compact. We improved the transport capacity of small mobile robots using a handcart. However, there were two problems faced: the risk of a slip and fall under the influence of the reaction force when the robot handles the object, and...
Two wheeled inverted pendulum (TWIP) robot is widely used in various applications for its zero turning radius, small footprint and other advantages. However, the traditional TWIP robot can not keep upright when climbs or descends on a slope, which makes the operator sitting on the robot feel unsafe and uncomfortable. This paper introduces a Multi-DOF TWIP robot, which adding a movable weight to the...
This paper describes design, simulation, and experiments of a mesoscale quadruped robot that can locomote by crawling and jumping. The robot has the length of 14 cm and the weight of 188 g. The robot is designed to perform crawling and jumping for the hybrid locomotion. The robot uses eight micro servo motors for crawling and four DC motors for jumping. The design has been validated by simulation...
In order to achieve large tolerance capture and high stiffness connection for space payload operations, a Chinese large-scale space end-effector (EER) was developed. Friction is a kind of strong nonlinear factor that severely degrades performance of EER. To predict the friction amplitude and compensate the dynamic error, the friction model based Generalized Maxwell-Slip model (GMS) is built. In order...
This paper considers Nonlinear Model Predictive Control (NMPC) in the context of snake robot locomotion. NMPC is an optimal control technique that offers the ability of handling constraints although requiring relatively significant computational resources. In detail, we show how NMPC can be applied to achieve straight line path following control of snake robots. The paper presents simulation results...
Herein, we propose a motion-control algorithm for a vehicle with a large sideslip angle. The proposed algorithm is designed on the basis of the planar motion of the vehicle using a four-wheel vehicle model. The proposed algorithm controls the vehicle velocity, sideslip angle of the vehicle, and yaw rate of the vehicle using the driving forces of the four-wheels and steer angle of the front wheels...
The article introduces an actinomorphic soft robot that possesses a flattened body with a number of arms radially symmetric distributing and extending from robot central disc. Hence, mimicking radially symmetric musculature animals like starfish. The robot arm system, consisted of arm and smart material alloy (SMA) springs is the support structure as well as the robot propulsion device. A novel approach...
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