Design and Implementation of Software System for Large-Scale Coordinate Measurement Based on the Laser Tracker

2011 ◽  
Vol 103 ◽  
pp. 320-326
Author(s):  
Zi Li Zhang ◽  
Jiang Yuan ◽  
Wei Hu Zhou ◽  
Ya Wei Wang ◽  
Yan Xu
Keyword(s):  
Large Scale ◽  
Spatial Information ◽  
Tracking System ◽  
Laser Tracker ◽  
Software System ◽  
Element Analysis ◽  
Laser Tracking ◽  
Design And Implementation ◽  
Precision Measuring ◽  
Error Calibration

The laser tracking system is widely used in the large-scale measurement field in industry providing accurate spatial information of measured objects. In this paper, the frame of software system for the laser tracker is introduced, as well as the design and implementation of each module. With the help of the software, customers can attain high precision measuring results within large volume. Functions of information communication, command control, error calibration and compensation, geometric element analysis and display can also be realized. The software system is divided into six modules, including the interconnect communication and on-line control module, error calibration and compensation module, data analysis module, database management module, 3D display of geometrical elements and man-machine interface. The design and construction of each module is described in detail which can help customers realize different functions throughout the measuring process.

scholarly journals Automatic Guidance Method for Laser Tracker Based on Rotary-Laser Scanning Angle Measurement

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4168
Author(s):  
Linghui Yang ◽  
Yuanlin Pan ◽  
Jiarui Lin ◽  
Yang Liu ◽  
Yue Shang ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Large Scale ◽  
Critical Role ◽  
Angle Measurement ◽  
Measurement Technology ◽  
Laser Tracker ◽  
Scanning Angle ◽  
Laser Tracking ◽  
Automatic Guidance ◽  
Laser Trackers

Laser-tracking measurement systems (laser tracker) have been playing a critical role in large-scale 3D high-precision coordinate measurement. However, the existing visual guidance of laser trackers is still limited by the disadvantages of operator-dependence, small-angle view field, time-consuming laser-guided process. This paper presents an automatic guidance method for laser trackers based on the rotary-laser scanning angle measurement technology. In this method, a special target consisting of six photoelectric receivers and a retroreflector is integrated into the rotary-laser scanning transmitter’ coordinate systems. Real-time constraints calculated by the proposed method would provide the coordinates of the target in a laser tracker coordinates system for guidance. Finally, the experimental results verified the automatic re-establish of sightline can be realized in horizontal 360° angle field within tens of arc-seconds, and this method is robust against the fast movement of the target.

Error Calibration Technique of Laser Tracker and its Application

2010 ◽  
Vol 455 ◽  
pp. 690-693
Author(s):  
Yong Gang Yan ◽  
Zhan Kui Wang ◽  
X.B. Wang ◽  
Y.Q. Li
Keyword(s):  
High Precision ◽  
Large Scale ◽  
The Body ◽  
Manufacturing Industries ◽  
Laser Tracker ◽  
Calibration Technique ◽  
Axis Direction ◽  
Calibration Methods ◽  
Error Calibration ◽  
Lathe Tool

Laser tracker has widely been used in manufacturing industries, such as the industry of the large-scale machining tool, automobile, aircraft. So a high precision laser tracker is essential to satisfy the measuring requirements. In the paper the errors of laser tracker was analyzed and their calibration methods were discussed and studied. Then a calibration for laser tracker was carried on by using CMM and the measuring accuracy was verified. Finally, we demonstrate the application of laser tracker for detecting the large-scale machining tools. The measurement shows that the feeding straightnesses of tool rest in the two orthogonal directions are 0.0564 mm and 0.0309 mm in the working scope respectively. The results show the straightness of the body guide for the lathe meets the requirement, whereas the lathe tool workbench on the X axis direction does not and needs to be adjusted.

A new boresighting method of the aircraft gun using a laser tracker

Sensor Review ◽  
2015 ◽  
Vol 35 (3) ◽  
pp. 251-262 ◽  
Author(s):  
Qing Wang ◽  
Peng Huang ◽  
Jiangxiong Li ◽  
Yinglin Ke
Keyword(s):  
Evaluation Method ◽  
Tracking System ◽  
Measurement Instrument ◽  
Calibration Method ◽  
Numerical Control ◽  
Special Equipment ◽  
Element Analysis ◽  
Content Type ◽  
Laser Tracking ◽  
Reference Axis

Purpose – The purpose of this paper is to propose an innovative method to extend the operating range of the laser tracking system and improve the accuracy and automation of boresighting by designing a measurement instrument. Boresighting is a process that aligns the direction of special equipment with the aircraft reference axis. Sometimes the accurate measurement and adjustment of the equipment and the aircraft are hard to achieve. Design/methodology/approach – The aircraft is moved by an automatic adjustment system which consists of three numerical control positioners. For obtaining the position of the bore axis, an instrument with two measurement points is designed. Based on the multivariate normal distribution hypothesis, an uncertainty evaluation method for the aiming points is introduced. The accuracy of the measurement point is described by an uncertainty ellipsoid. A compensation and calibration method is proposed to decrease the effect of manufacturing error and deflection error by the finite element analysis. Findings – The experimental results of the boresighting measurement prove that the proposed method is effective and reliable in digital assembly. The measurement accuracy of the angle between the bore axis and the reference axis is about ±0.004°. In addition, the measurement result is mainly influenced by the position error of the instrument. Originality/value – The results of this study will provide a new way to obtain and control the installation deviation of part in aircraft digital assembly and will help to improve the precision and efficiency. This measurement method can be applied to obtain the axis of a deep blind hole.

Structural Dynamics Analysis of Three-Dimensional Bi-Axial Sun-Tracking System Structure Determined by Numerical Modal Analysis

2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Fateh Ferroudji ◽  
Cherif Khelifi ◽  
Toufik Outtas
Keyword(s):  
Large Scale ◽  
Tracking System ◽  
Dynamic Performance ◽  
Three Dimensional ◽  
System Structure ◽  
Quality Factors ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Modal Damping ◽  
Key Factor

Sun-tracking system (STS) is a key factor for solar photovoltaic (PV) future and new answers for the solar market. It will expand large-scale PV projects (PV farms) worldwide, and it is possible to collect more energy from the sun. PV farms consist of thousands of STS that are subject to dynamic loads (wind, snow, etc.), vibrations, and gravitational loads. This paper presents the structural dynamic analysis of a 24 m2 bi-axial STS (azimuth-elevation) at different elevation angles based on its modal parameters (natural frequencies, modal shapes, and modal damping ratios) and dynamic performance indices (modal participation factors (MPF), forcing frequencies, and mechanical quality factors) by means of the finite element analysis (FEA). The simulation results show that the structural dynamic design of the STS meets the desired structural requirements and agrees well with structural dynamic standards (EN 1991-1-4 and ASHRAE). These results can be used for further analysis on optimal design and vibration safety verification for the bi-axial STS (PV applications).

Do elite soccer players cover longer distance when losing? Differences between attackers and defenders

2020 ◽  
pp. 174795412098227
Author(s):  
Carlos Lago-Peñas ◽  
Anton Kalén ◽  
Miguel Lorenzo-Martinez ◽  
Roberto López-Del Campo ◽  
Ricardo Resta ◽  
...  
Keyword(s):  
New York ◽  
High Speed ◽  
Large Scale ◽  
Tracking System ◽  
Soccer Players ◽  
Running Performance ◽  
Situational Variables ◽  
Total Distance ◽  
Professional Soccer ◽  
Score Line

This study aimed to evaluate the effects playing position, match location (home or away), quality of opposition (strong or weak), effective playing time (total time minus stoppages), and score-line on physical match performance in professional soccer players using a large-scale analysis. A total of 10,739 individual match observations of outfield players competing in the Spanish La Liga during the 2018–2019 season were recorded using a computerized tracking system (TRACAB, Chyronhego, New York, USA). The players were classified into five positions (central defenders, players = 94; external defenders, players = 82; central midfielders, players = 101; external midfielders, players = 72; and forwards, players = 67) and the following match running performance categories were considered: total distance covered, low-speed running (LSR) distance (0–14 km · h−1), medium-speed running (MSR) distance (14–21 km · h−1), high-speed running (HSR) distance (>21 km · h−1), very HSR (VHSR) distance (21–24 km · h−1), sprint distance (>24 km · h−1) Overall, match running performance was highly dependent on situational variables, especially the score-line condition (winning, drawing, losing). Moreover, the score-line affected players running performance differently depending on their playing position. Losing status increased the total distance and the distance covered at MSR, HSR, VHSR and Sprint by defenders, while attacking players showed the opposite trend. These findings may help coaches and managers to better understand the effects of situational variables on physical performance in La Liga and could be used to develop a model for predicting the physical activity profile in competition.

scholarly journals Stator Non-Uniform Radial Ventilation Design Methodology for a 15 MW Turbo-Synchronous Generator Based on Single Ventilation Duct Subsystem

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2760
Author(s):  
Ruiye Li ◽  
Peng Cheng ◽  
Hai Lan ◽  
Weili Li ◽  
David Gerada ◽  
...  
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Design Methodology ◽  
Large Scale ◽  
Synchronous Generator ◽  
Axial Direction ◽  
Scale Model ◽  
Element Analysis ◽  
Axial Temperature ◽  
Ventilation Duct

Within large turboalternators, the excessive local temperatures and spatially distributed temperature differences can accelerate the deterioration of electrical insulation as well as lead to deformation of components, which may cause major machine malfunctions. In order to homogenise the stator axial temperature distribution whilst reducing the maximum stator temperature, this paper presents a novel non-uniform radial ventilation ducts design methodology. To reduce the huge computational costs resulting from the large-scale model, the stator is decomposed into several single ventilation duct subsystems (SVDSs) along the axial direction, with each SVDS connected in series with the medium of the air gap flow rate. The calculation of electromagnetic and thermal performances within SVDS are completed by finite element method (FEM) and computational fluid dynamics (CFD), respectively. To improve the optimization efficiency, the radial basis function neural network (RBFNN) model is employed to approximate the finite element analysis, while the novel isometric sampling method (ISM) is designed to trade off the cost and accuracy of the process. It is found that the proposed methodology can provide optimal design schemes of SVDS with uniform axial temperature distribution, and the needed computation cost is markedly reduced. Finally, results based on a 15 MW turboalternator show that the peak temperature can be reduced by 7.3 ∘C (6.4%). The proposed methodology can be applied for the design and optimisation of electromagnetic-thermal coupling of other electrical machines with long axial dimensions.

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