scholarly journals A hierarchical on-line path planning scheme using wavelets

2007 ◽  
Author(s):  
Panagiotis Tsiotras ◽  
Efstathios Bakolas
Keyword(s):  
Path Planning ◽  
Planning Scheme ◽  
On Line ◽  
Line Path

On Superquadric Human Modeling and Risk Assessment for Safe Planning of Human-Safe Robotic Systems

2010 ◽  
Vol 2 (4) ◽  
Author(s):  
Nima Najmaei ◽  
Mehrdad R. Kermani
Keyword(s):  
Path Planning ◽  
Human Body ◽  
Human Robot Interaction ◽  
Body Orientation ◽  
Human Model ◽  
Computationally Efficient ◽  
Planning Scheme ◽  
On Line ◽  
Evaluation Metric ◽  
Line Path

This paper introduces a new superquadric-based human body modeling technique. The model is used as part of an on-line path planning scheme. The path planning scheme utilizes a previously proposed danger evaluation metric in which danger is characterized based on human and nonhuman factors. A new factor that accounts for the human body orientation is introduced and used along with other factors for danger evaluation. A superquadric model of the human is used to determine the values of the factors used for danger evaluation including body orientation. The resulting danger value is then used to direct the search for an alternative robot path in a direction that minimizes the danger. The use of superquadric-based human model for danger evaluation and subsequently path planning provides an accurate and computationally efficient solution. At the same time, the resulting solution guarantees a safe and danger-free path, given the factors used to characterize the danger. The approach exhibits adequate speed of decision making, rendering it potentially suitable for real-time applications involving human-robot interaction. The proposed method is evaluated using a CRS-F3 industrial manipulator through various case studies.

Combined Trajectory Planning and Parameter Identification of a Two-Link Rigid Manipulator

1998 ◽  
Author(s):  
Reza Fotouhi-C. ◽  
Peter N. Nikiforuk ◽  
Walerian Szyszkowski
Keyword(s):  
Path Planning ◽  
Trajectory Planning ◽  
Equations Of Motion ◽  
Adaptive Controller ◽  
Time Variable ◽  
Physical Parameters ◽  
Planning Problem ◽  
Unknown Parameters ◽  
On Line ◽  
Line Path

Abstract A combined trajectory planning problem and adaptive control problem for a two-link rigid manipulator is presented in this paper. The problem is divided into two parts: path planning for off-line processing, followed by on-line path tracking using an adaptive controller. The path planning is done at the joint level. The motion of the robot is specified by a sequence of knots (positions of the robot’s tip) in space Cartesian coordinates. These knots are then transformed into two sets of joint displacements, and piecewise cubic polynomials are used to fit these two sequences of joint displacements. The cubic spline function is used to construct a trajectory with the velocity and the acceleration as constraints. Linear scaling of the time variable is used to accommodate the velocity and acceleration constraints. A nonlinear scaling of the time variable is performed to fit the velocity to a pre-specified velocity profile. The adaptive scheme used takes full advantage of the known parameters of the manipulator while estimating the unknown parameters. In deriving the dynamic equations of motion, all of the physical parameters of the manipulator, including the distributed masses of the links, are taken into account. Some simulation results for the manipulator with unknown payload masses following a planned trajectory are presented.

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