scholarly journals A trajectory planning method for the redundant manipulator based on configuration plane

2021 ◽  
Vol 18 (6) ◽  
pp. 172988142110585
Author(s):  
Yanhui Wei ◽  
Zhi Zheng ◽  
Qiangqiang Li ◽  
Jialin He
Keyword(s):  
Velocity Distribution ◽  
Obstacle Avoidance ◽  
Trajectory Planning ◽  
Spatial Interpolation ◽  
Planning Method ◽  
Redundant Manipulators ◽  
Analysis Method ◽  
Kinematics Analysis ◽  
Redundant Manipulator

This study focuses on the method of trajectory planning of spatial obstacle avoidance for redundant manipulators based on configuration plane method. Firstly, according to the summary of the work configuration for redundant manipulator, kinematics analysis method based on configuration plane is proposed, which helps to establish a basic kinematics model of configuration plane. Secondly, the analysis of velocity is conducted and velocity iterative formula is derived. Then, the process of the trajectory planning for redundant manipulator based on the velocity distribution of configuration plane is given, during which some key procedures such as the determination of work configuration, achieving spatial obstacle avoidance, and analysis of velocity distribution are deduced. Finally, the simulation of spatial circle trajectory planning for the 7-degree-of-freedom redundant manipulator is done. The experimental results show that the proposed trajectory planning method for redundant manipulator can satisfy the requirements of complex spatial obstacle avoidance and increase the controllability of the trajectory between spatial interpolation points of the manipulator’s end effector.

Gain-optimization trajectory planning method for hyper-redundant manipulator with joint constraints

2019 ◽  
Vol 27 (5) ◽  
pp. 1075-1086
Author(s):  
王文瑞 WANG Wen-rui ◽  
刘克俭 LIU Ke-jian ◽  
顾金麟 GU Jin-lin ◽  
李 昂 LI Ang ◽  
储海荣 CHU Hai-rong ◽  
...  
Keyword(s):  
Trajectory Planning ◽  
Planning Method ◽  
Redundant Manipulator ◽  
Joint Constraints ◽  
Gain Optimization

Inverse Kinematics of Serial Redundant Manipulators With Locked Articulations

1995 ◽  
Author(s):  
Louis Perreault ◽  
Clément M. Gosselin
Keyword(s):  
Inverse Kinematics ◽  
General Procedure ◽  
Inverse Kinematic ◽  
Redundant Manipulators ◽  
Redundant Manipulator ◽  
Inverse Kinematic Problem

Abstract This paper presents an algorithm for the solution of the inverse kinematics of a serial redundant manipulator with one (or more) locked joint(s). To this end, a general procedure is developed for the determination of the equivalent Denavit-Hartenberg parameters of a serial manipulator with locked joints. This procedure can be applied to any serial architecture. The solution of the inverse kinematic problem for the three cases which can arise is then addressed. An example of the application of the method to a SARCOS 7-DOF manipulator is also given.

scholarly journals An improved artificial potential field method of trajectory planning and obstacle avoidance for redundant manipulators

2018 ◽  
Vol 15 (5) ◽  
pp. 172988141879956 ◽  
Author(s):  
Wenrui Wang ◽  
Mingchao Zhu ◽  
Xiaoming Wang ◽  
Shuai He ◽  
Junpei He ◽  
...  
Keyword(s):  
Obstacle Avoidance ◽  
Trajectory Planning ◽  
Potential Field ◽  
Lyapunov Stability Theory ◽  
Field Method ◽  
Artificial Potential Field ◽  
Redundant Manipulators ◽  
Field Function ◽  
Potential Field Method ◽  
Artificial Potential Field Method

In this article, we present an improved artificial potential field method of trajectory planning and obstacle avoidance for redundant manipulators. Specifically, we not only focused on the position for the manipulator end-effectors but also considered their posture in the course of trajectory planning and obstacle avoidance. We introduced boundaries for Cartesian space components to optimize the attractive field function. Moreover, the manipulator achieved a reasonable speed to move to the target pose, regardless of the difference between the initial pose and target pose. We proved the stability using Lyapunov stability theory by introducing velocity feedforward, when the manipulator moved along a continuous trajectory. Considering the shape of the manipulator joints and obstacles, we set up the collision detection model by projecting the obstacles to link coordinates. In this case, establishing the repulsive field between the nearest points on every joint and obstacles with the closest distance was sufficient for achieving obstacle avoidance for redundant manipulators. The simulation results based on a nine-degree-of-freedom hyper-redundant manipulator, which was designed and made in our laboratory, fully substantiated the efficacy and superiority of the proposed method.

Motion Planning for a Redundant Manipulator Using Genetic Algorithm

2011 ◽  
Vol 467-469 ◽  
pp. 782-787 ◽  
Author(s):  
S. Parasuraman ◽  
Chiew Mun Hou ◽  
V. Ganapathy
Keyword(s):  
Genetic Algorithm ◽  
Trajectory Planning ◽  
Collision Detection ◽  
Angular Displacement ◽  
Joint Space ◽  
Redundant Manipulators ◽  
Evaluation Function ◽  
Redundant Manipulator ◽  
End Effector ◽  
Total Displacement

The trajectory planning of redundant manipulator is key areas of research, which require efficient optimization algorithms. This paper presents a new method that combines multiple objectives for trajectory planning and generation for redundant manipulators. The algorithm combines collision detection, finding target and optimizing trajectory using Genetic algorithm. In order to optimize the path, an evaluation function is defined based on multiple criteria, including the total displacement of the end-effector, the total angular displacement of all the joints, as well as the uniformity of Cartesian and joint space velocities. These criteria result in minimized, smooth end-effector motions. These algorithm yields solutions instantaneously and generate the path. The proposed algorithm is analyzed and its performance is demonstrated through simulation and the results are compared with the other methods.

Task planning for serial redundant manipulators

Robotica ◽  
1997 ◽  
Vol 15 (1) ◽  
pp. 75-83 ◽  
Author(s):  
J. A. Kuo ◽  
D. J. Sanger
Keyword(s):  
Kinematic Analysis ◽  
Inverse Analysis ◽  
Elastic System ◽  
Planning Method ◽  
Joint Motion ◽  
Redundant Manipulators ◽  
Task Planning ◽  
Redundant Manipulator ◽  
Arbitrary Degree ◽  
Joint Configuration

The first stage in developing a task planning language for redundant manipulators is that of constructing an algorithm to produce a schedule of joint displacements for the specified task. This algorithm may be based upon the use of an inverse infinitesimal kinematic analysis for the majority of the path with a finite inverse analysis used to provide an initial joint configuration and periodically to correct for any joint errors that may have accumulated. Here, it is assumed that there is complete correlation and coherence of solutions between these analyses, otherwise problems, such as a lack of repeatability may occur. This may be accomplished by modelling the manipulator as an elastic system which permits the development of a task planning method by using analyses which are all mutually coherent. In this paper, the method is developed and demonstrated using a redundant manipulator that simultaneously avoids obstables, singularities and joint motion limitations. The task planning method and associated analyses are applicable to the general serial redundant manipulator with an arbitrary degree of redundancy.

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