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In this paper a numerical approach for the position, velocity and acceleration analysis for a 5R parallel manipulator is presented. 5R parallel manipulator is a two degrees of freedom planar mechanism which has been extensively studied by analytical methods. In this work, the use of computational tools such as Matlab and ADAMS is proposed in order to solve the inverse and forward kinematic problem...
This paper presents a non-geometric method for solving the inverse kinematics of a ship motion simulation system having Delta structure as shown in Fig. 1, and then investigated the problem of path tracking control generally. As the complexity of the joint structure of this system, obtaining the inverse kinematics is difficult and computationally expensive and traditional methods such as geometric,...
A novel algorithm for planning robotic manipulation tasks is presented in which the base position and joint motions of a robot are simultaneously optimized to follow a smooth desired end-effector trajectory. During the optimization routine, the manipulator's base position and joint motions are planned simultaneously by strategically moving a set of virtual robot arms (each representing a single configuration...
In this paper, the effect of adding sliding mode methodology to the kinematic control of robot manipulators with damped least square (DLS) Jacobian inverse is studied. The proposed controller is experimentally tested on a 6 degree of freedom (DoF) robotic manipulator. Three different types of end-effector path are considered for which the controller performance is evaluated. The results show that...
This paper presents a stepping path planning approach for a climbing robot inspired kinematically from an inchworm caterpillar's looping locomotion. This approach generates an optimised multi-step path to traverse through space and to land a specific footpad onto a selected point on a surface with a specific footpad orientation. The candidate landing joint configuration for each step is generated...
The classical kinematic approach used in analyzing systems of a small number of interconnected bodies is unsuitable for researching complex kinematics. Moreover, solving nonlinear algebraic equations that involve trigonometric functions is difficult. However, the computational kinematic approach involves using a set of algebraic kinematic equations that describe the joint connectivity between the...
Inverse kinematics algorithms are commonly used in robotic systems to accomplish desired behavior, and several methods exist to ensure the achievement of several tasks simultaneously. The multiple task-priority inverse kinematics framework allows tasks to be considered in a prioritized order by projecting task velocities through the nullspaces of higher priority tasks. This paper extends this framework...
This paper presents a novel control architecture for controlling a moving remote center of motion in addition to the end-effector motion during robotic surgery. In minimally invasive surgery, it is common to require that the point at which the robot enters the body, called the incision point or the trocar, does not allow for any lateral motion. It is generally considered that no motion should be applied...
In this paper, an impedance control scheme for cooperative quadrotors with robotic arms is proposed in order to limit both the contact forces, due to the object/environment interaction, and the internal forces, due to the manipulators/ object interaction. To this aim, two impedance filters are used to determine the reference trajectories for manipulator end effectors: the first is aimed at conferring...
This paper presents the kinematic analysis of the SCORBOT-ER 4u robot arm using a Multi-Layered Feed-Forward (MLFF) Neural Network. The SCORBOT-ER 4u is a 5-DOF vertical articulated educational robot with revolute joints. The Denavit-Hartenberg and Geometrical methods are the forward kinematic algorithms used to generate data and train the neural network. The learning of forward-inverse mapping enables...
Dual-arm Underwater Vehicle-Manipulator Systems are able perform a variety of interventions tasks, and there are still many challenges related to making such vehicles autonomous. This paper presents a guidance method for generating reference trajectories for such a system by considering the main manipulator and the vehicle base as a leader unit and the secondary manipulator as a follower unit. The...
This paper addresses the open challenge of planning quasi-static walking motions for robots with kinematically redundant limbs. Focusing on RoboSimian, a quadrupedal robot developed by the Jet Propulsion Laboratory (JPL), we develop a practical method for generating statically stable walking motions by pre-computing a reduced dimensional inverse kinematics (IK) lookup table with certain uniqueness...
An algorithm that simulates the trajectories for a 6 -DOF articulate manipulator was proposed. A Fanuc-type 6-DOF industrial manipulator was first modeled in MATLAB, then using basic matrix computations, a simplified algorithm was developed which is capable of efficiently computing the trajectory of the known manipulator and a Guide User Interface (GUI) was developed to simulate the trajectory in...
This paper presents the idea of employing constraints to expand the workspace of Underactuated Flexible Manipulators (UFM). The constraints are divided into two types: bilateral constraint (BC) and unilateral constraint (UC). Under the constraints the UFM is segmented into two sections: the anterior constrained section and the distal free section; moreover, the motion of the UFM is altered, i.e.,...
Three different approaches of having a full-size humanoid throw the first pitch at a Major League Baseball game are tested and implemented. The approaches include kinematic mapping using a motion capture system to capture a human's throwing motion then mapping that to a full-size humanoid. The second method is a fully automated approach that uses the sparse reachable map to provide viable full body...
In this paper, based on new presented approach for forward kinematic problem, length measuring system for Stewart platform is designed. The analysis is performed by using a software platform which models the system dynamics and control. A typical feedback linearization method is used to design the controller system and performance of designed controller is studied numerically with respect to measuring...
Many tasks that would be of benefit to users in domestic environments require that robots manipulate articulated objects such as doors and drawers. In this paper, we present a novel approach that simultaneously estimates the kinematic model of an articulated object based on the trajectory described by the robot's end effector, and uses this model to predict the future trajectory of the end effector...
Redundant robotic manipulators under kinematic control may exhibit unpredictable behaviours at joint level. When the end-effector describes a closed trajectory, the joint angles may not return to their initial values and final configuration in the joint space may depend on the trajectory followed by the end-effector. In this paper, a complete parameterization of holonomic local control strategies...
A multistage data-driven neuro-fuzzy system is considered for the multiobjective trajectory planning of Parallel Kinematic Machines (PKMs). This system is developed in two major steps. First, an offline planning based on robot kinematic and dynamic models, including actuators, is performed to generate a large dataset of trajectories, covering most of the robot workspace and minimizing time and energy,...
Because of great shock in the process of launching of rocket, structure deformation during work, displacement of sensors and other factors, the kinematic parameters of space manipulator will deviate from the parameters calibrated on the ground, which will decrease the positioning accuracy of space manipulator. Therefore, the space manipulator should be calibrated to ensure its positioning accuracy...
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