scholarly journals A GRAPPA algorithm for arbitrary 2D/3D non‐Cartesian sampling trajectories with rapid calibration

2019 ◽  
Author(s):  
Tianrui Luo ◽  
Douglas C. Noll ◽  
Jeffrey A. Fessler ◽  
Jon‐Fredrik Nielsen
Keyword(s):  
Rapid Calibration

A simple and rapid calibration methodology for industrial robot based on geometric constraint and two-step error

2018 ◽  
Vol 45 (6) ◽  
pp. 715-721 ◽  
Author(s):  
Jiabo Zhang ◽  
Xibin Wang ◽  
Ke Wen ◽  
Yinghao Zhou ◽  
Yi Yue ◽  
...  
Keyword(s):  
Coordinate System ◽  
Large Scale ◽  
Industrial Robot ◽  
Geometric Constraint ◽  
Machining Process ◽  
Kinematic Parameters ◽  
Robot Calibration ◽  
Positioning Accuracy ◽  
Content Type ◽  
Rapid Calibration

Purpose The purpose of this study is the presentation and research of a simple and rapid calibration methodology for industrial robot. Extensive research efforts were devoted to meet the requirements of online compensation, closed-loop feedback control and high-precision machining during the flexible machining process of robot for large-scale cabin. Design/methodology/approach A simple and rapid method to design and construct the transformation relation between the base coordinate system of robot and the measurement coordinate system was proposed based on geometric constraint. By establishing the Denavit–Hartenberg model for robot calibration, a method of two-step error for kinematic parameters calibration was put forward, which aided in achievement of step-by-step calibration of angle and distance errors. Furthermore, KUKA robot was considered as the research object, and related experiments were performed based on laser tracker. Findings The experimental results demonstrated that the accuracy of the coordinate transformation could reach 0.128 mm, which meets the transformation requirements. Compared to other methods used in this study, the calibration method of two-step error could significantly improve the positioning accuracy of robot up to 0.271 mm. Originality/value The methodology based on geometric constraint and two-step error is simple and can rapidly calibrate the kinematic parameters of robot. It also leads to the improvement in the positioning accuracy of robot.

scholarly journals Rapid calibration of an intracortical brain–computer interface for people with tetraplegia

2018 ◽  
Vol 15 (2) ◽  
pp. 026007 ◽  
Author(s):  
David M Brandman ◽  
Tommy Hosman ◽  
Jad Saab ◽  
Michael C Burkhart ◽  
Benjamin E Shanahan ◽  
...  
Keyword(s):  
Brain Computer Interface ◽  
Computer Interface ◽  
Rapid Calibration

The Computer Calibration Modeling of Radial Distortion Based Weld System with Parallel Planes

2012 ◽  
Vol 463-464 ◽  
pp. 1397-1401
Author(s):  
Peng Peng
Keyword(s):  
Control System ◽  
Automatic Calibration ◽  
Radial Distortion ◽  
Precision Characteristic ◽  
Non Linear ◽  
Rapid Calibration

The paper illuminates the designed automatic weld control system. The RAC calibration arithmetic considering radial distortion is introduced, and according to the actual conditions of this weld system, the inchoate rapid calibration arithmetic is designed. Finally combined with the precision characteristic of the non-linear RAC calibration arithmetic and the concision characteristic of the inchoate rapid arithmetic, the improved automatic calibration arithmetic with six parameters is proposed, which achieves satisfied result.

Aerial photosieving of exposed gravel bars for the rapid calibration of airborne grain size maps

2010 ◽  
pp. n/a-n/a ◽  
Author(s):  
Stephen J. Dugdale ◽  
Patrice E. Carbonneau ◽  
David Campbell
Keyword(s):  
Grain Size ◽  
Gravel Bars ◽  
Rapid Calibration
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