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The self-identification of a redundantly actuated parallel manipulator is transformed into an optimization problem, and then differential evolution algorithm is used to obtain a globally optimal solution of the kinematic parameters. Based on the kinematic equations of the parallel manipulator, a new optimization function is formulated by eliminating the passive joint angles and decoupling the kinematic...
This paper suggests a novel reaction force control in a robot manipulator by position feedback, motivated by the analysis of human musculoskeletal system. First, we suggest an analogy between a muscle force characteristic and two-degree-of-freedom control input structure so that the complicated human muscle structure can be reflected in robot manipulator control: reaction force generated by the viscoelasticity...
A simple, under-actuated robotic winch, called the “Winch-Bot,” is developed for surface inspection of a large object. The Winch-Bot, placed over an object surface, has only one actuator for tracing a free geometric path in a vertical plane. The cable length is controlled in relation to the direction of the cable so that the inspection end-effecter hanging at the tip of the cable can follow the path...
This paper reveals the advantage of the biarticular muscle which has been said to play an important role in human's motion control and applies it to the robot manipulator control. Biarticular muscle changes the energy flow in muscles resulting in efficient motion and help stabilizing the posture of the human body. These advantages are analyzed and reflected to the control of a robot manipulator. In...
Obtaining the joint variables that result in a desired position of the robot end-effector called as inverse kinematics is one of the most important problems in robot kinematics and control. As the complexity of robot increases, obtaining the inverse kinematics solution requires the solution of non linear equations having transcendental functions are difficult and computationally expensive. This paper...
This paper deals with motion control of throwing generated by dexterous action. Dexterous actions can be seen in many sports. In baseball pitching, dexterous throwing seems to use energy transfer and a physical constraint at the elbow joint. To implement the dexterous throwing, two types of two-link underactuated manipulator are presented. One model has a spring at 2nd joint which represents an arm's...
A model of the human upper limb was developed for predicting the motion of the human upper limb while performing activities of daily living. This study focuses on the effect of a joint limit function on the ability of the model to perform human like movements. This measurement was analysed by comparing the modelled joint movements with recorded movements of subjects while drinking from a cup, opening...
In this work, the motions of an underwater remotely operated vehicle (ROV) and a spatial manipulator are coordinated using a consolidated controller. The controller translates a single pilot command, the desired position and orientation of the end effector, into a coordinated set of ROV and manipulator joint motions that satisfy the pilot intent in addition to a series of secondary objectives. The...
The application of Singular Value Decomposition (SVD) methods to investigate motion control of a robotic simulator adds new insight into the optimization of fixed parameters within the device. These fixed parameters within the simulator can be optimized apriori before motion field simulation actually begins by the investigation of the SVD of the Jacobian matrix. Of particular interest is the minimum...
Many robotic maipulator tasks involve arm motions which are constrained by the task geometry. This paper presents a new approach, based on the theory of variable structure systems and sliding mode, for the analysis and control design for robotic systems subject to task constraints.
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