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A low-cost and easy-to-customize Cable-driven Wrist Robotic Rehabilitor (CDWRR) has been developed for forearm and wrist motion training. This device can be potentially applied to rehabilitation of stroke patients for three degree-of-freedom (3-DOF) arm motion, including forearm supination/pronation, wrist flexion/extension and ulnar/radial deviation. The CDWRR can be customized for patients with...
The study of quadruped robots is an important branch of robotics. As is known to all, quadruped robots can go through the rough terrain easily and they are useful in field operation. Whether quadruped robot can interact softly with the environment is an important index to value its property. This paper presents the preliminary research of a quadruped robot, mainly focus on the mechanical design and...
A terrain analysis method with a scanning laser range finder was proposed. For five typical kinds of terrain, including flat ground, vertical wall, slope, step and cuboid obstacle, the method can distinguish them successfully. Comparing with some methods used cameras, it's more simple and has less calculation. For the uneven terrain like slope, step, cuboid obstacle and so on, a leg joint adjustment...
This paper focuses on the control of hexapod locomotion based on a model of artificial central pattern generators (CPGs). CPG-based controllers are capable of producing coordinated patterns in open loops and rhythmic activities in certain joints. However, existing methods usually have too many parameters to set and lack unified expressions to achieve desired gaits for multiple legged robots. In this...
This paper provides a three-dimensional quantitative description method of cockroach movement. An experimental platform is built to observe the locomotion of cockroach, which is made of two parts: a high speed camera is used to record the locomotion, and two mirrors that locate two franks provide visual frames. Mathematical model of the platform was provided so that 3D coordinates of cockroach can...
The research area of bio-inspired control methods for multi-legged robots and reptile robots has made significant development with the use of central pattern generators (CPGs) in recent years. However, there are still many problems to be solved to learn clearly the structure of CPG to adapt it to different applications. In this article, we use a method to configure CPG which makes the CPG have adaptive...
A human upper-limb endoskeleton has 7 degrees of freedom to achieve various tasks dexterously. Therefore, the biological structures of human arm are attractive to researchers, and in this paper, a 7-DOF (degree of freedom) humanoid arm with cable-driven is presented. For CDHA inheriting the human arm's natural features, it is expected to possess the remarkable advantages of a human arm. Then a critical...
In this paper, we present a method to plan gait for a four legged robot that we specially design for realizing stability locomotion. Gait is crucial to the four legged robot locomotion, especially when the robot intends to get through irregular terrains adaptively. Compare to six legged robot or more leg robot, four legged robot easily loses its stability and slip up. We firstly analyze the locomotion...
This paper presents the control of a 3-DOF manipulator with joint angle feedback, the function of which was achieved by three mutually perpendicular joints intersecting at one point actuated by four parallel pulling force. Encoders were installed on each joint to obtain the control error caused by elasticity of cables and mechanism installation. Due to the output coupling problem of parallel mechanism,...
In this paper, a cable-driven spherical joint with angle feedback is proposed and the geometric numerical inverse kinematic algorithm is analyzed. Based on this, a new online control method is presented. In this method, the actual position of the spherical joint is calculated via inverse kinematics and the control error is compensated immediately. A experimental system with industrial PC (IPC) and...
This article proposes a couple four-bar linkage mechanism for the cockroach robot, which integrates advantages of existing mechanisms. The novel mechanism has a good rigidity and a strong bearing capacity. It can be decoupling controlled and move agilely. Firstly, the movement performance of the mechanism including the backward and forward kinematics is analyzed. Secondly, a decoupling algorithm is...
Through designing a main controller based on the AVR microprocessor, this paper proposes an approach to realize RX-28 multi-Dynamixel control to replace with conventional motor control. In addition, the mechanism of data transmission is designed also in the main controller. Aiming at the shortcoming of Dynamixel RX-28 that cannot be online controlled, a control software is developed under the programming...
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