A 5-DOF Movement Simulator of Spacecraft and Its Position Measurement Method

2006 ◽  
Author(s):  
Lijin Fang ◽  
Chunying Jiang ◽  
Mingyang Zhao
Keyword(s):  
Measurement Method ◽  
Position Measurement

scholarly journals A New Rotor Position Measurement Method for Permanent Magnet Spherical Motors

2018 ◽  
Vol 8 (12) ◽  
pp. 2415 ◽  
Author(s):  
Yin Lu ◽  
Cungang Hu ◽  
Qunjing Wang ◽  
Yi Hong ◽  
Weixiang Shen ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Measurement Method ◽  
Coordinate Frame ◽  
Feature Points ◽  
Position Measurement ◽  
Experimental Platform ◽  
Rotor Position ◽  
Straight Line ◽  
The World

This paper proposes a new high-precision rotor position measurement (RPM) method for permanent magnet spherical motors (PMSMs). In the proposed method, a LED light spot generation module (LSGM) was installed at the top of the rotor shaft. In the LSGM, three LEDs were arranged in a straight line with different distances between them, which were formed as three optical feature points (OFPs). The images of the three OFPs acquired by a high-speed camera were used to calculate the rotor position of PMSMs in the world coordinate frame. An experimental platform was built to verify the effectiveness of the proposed RPM method.

Image position measurement method of the fish-eye camera using identification marker

2017 ◽  
Vol 2017 (0) ◽  
pp. 1P2-K02
Author(s):  
Naoya HATAKEYAMA ◽  
Tohru SASAKI ◽  
Kenichi KUROSAWA ◽  
Masahiro FUNATO ◽  
Mitsuru JINDAI
Keyword(s):  
Measurement Method ◽  
Position Measurement ◽  
Image Position ◽  
Fish Eye

scholarly journals On-machine Measurement and Uncertainty Analysis for Semicircular Narrow Neck Thickness based on Ultra-precision Machine Tool

2021 ◽  
Author(s):  
Xin Jin ◽  
Ruilin Gao ◽  
Chaojiang Li ◽  
Zhong peng Zheng ◽  
zhen Zuo
Keyword(s):  
Measurement Method ◽  
Dimensional Accuracy ◽  
Position Measurement ◽  
Measuring Device ◽  
Flexible Joint ◽  
Accuracy Requirement ◽  
Narrow Neck ◽  
Precision Machine ◽  
Measuring Accuracy ◽  
Ultra Precision

Abstract As flexible joint is a typical low-rigidity micro part, which have four narrow neck structures evenly distributed around its central axis, it is necessary to strictly control the dimensional accuracy of the narrow necks to improve the consistency of stiffness. However, the radius of the arc of the narrow necks is less than 2mm, and the thickness of thinnest part of the necks formed by two adjacent arcs is only tens of microns, which also has sub-micron accuracy requirement. These cross-scale dimensional characteristics and accuracy requirements give rise to extremely difficulty on the measuring process. In this paper, an on-machine measurement method for the semicircular narrow necks was presented and a measuring device was developed based on the comparative principle by making full use of the high linearity characteristic in the small measuring range of the sensor probes. Meanwhile, the on-machine measurement process based on ultra-precision machine tools was also introduced in details. The experiments results show that the uncertainty of the measurement method proposed is less than 0.2µm, and the repeatability is less than 0.1μm, which meet the measuring requirement of flexible joint. Furthermore, the effect of probe position, measurement force, environmental factor and the accuracy of the sensor on total measuring accuracy was analyzed, which could provide further evidences to improve the measuring accuracy. of micro-scale hybrid surface texture.

Position and Posture Measurement Method of the Omnidirectional Camera Using Identification Markers

2018 ◽  
Vol 30 (3) ◽  
pp. 354-362 ◽  
Author(s):  
Naoya Hatakeyama ◽  
◽  
Tohru Sasaki ◽  
Kenji Terabayashi ◽  
Masahiro Funato ◽  
...  
Keyword(s):  
Measurement Method ◽  
Position Control ◽  
Three Dimensional ◽  
Position Estimation ◽  
Position Measurement ◽  
Omnidirectional Camera ◽  
Camera Systems ◽  
Dimensional Measurements ◽  
Aerial Vehicle ◽  
Image Position

Recently, many studies on unmanned aerial vehicle (UAVs) that perform position control using camera images have been conducted. The measurements of the surrounding environment and position of the mobile robot are important in controlling the UAV. The distance and direction of the optical ray to the object can be obtained from the diameter and coordinates in the image. In these studies, various camera systems using plane cameras, fisheye cameras, or omnidirectional cameras are used. Because these camera systems have different geometrical optics, one simple image position measurement method cannot yield the position and posture. Therefore, we propose a new method that measures the position from the size of three-dimensional landmarks using omnidirectional cameras. Three-dimensional measurements are performed by these omnidirectional cameras using the distance and direction to the object. This method can measure three-dimensional positions from the direction and distance of the ray; therefore, if the optical path such as the reflection or refraction is known, it can perform measurements using a different optical system’s camera. In this study, we construct a method to obtain the relative position and relative posture necessary for the self-position estimation based on an object with an omnidirectional camera; further, we verify this method by experiment.

Research on the Splitting Measurement Method of Space Position in Three-Dimensional Field

2010 ◽  
Vol 139-141 ◽  
pp. 2015-2018
Author(s):  
De Xi Wang ◽  
Qin Li ◽  
Fu Bao Li ◽  
Zong Ke Li
Keyword(s):  
Measurement Method ◽  
Optical Design ◽  
Three Dimensional ◽  
Ccd Camera ◽  
Spatial Location ◽  
Object Point ◽  
Position Measurement ◽  
Spatial Coordinates ◽  
Flat Mirror ◽  
Point Of Intersection

A research on measurement method of space position in three-dimensional field was demonstrated in this paper. According to the basic methods and principles of three-dimensional spatial position measurement, optical path of splitting design was used to divide an object point, through the red and green filters, into two beams of red and green, and then, through flat mirror, rectangular prism, cube prism and other optical design, it imaged on the same CCD camera film. Standard mesh was used to determine the relationship between two different spatial coordinates and the spatial pixel coordinates in the measurement space, and then the calibration relationship between object point coordinates and pixel coordinates were determined. This calibration relationship clear the error caused by the method of measurement and the measurement system. Through the determination algorithm of spatial location in three-dimensional field, the two corresponding lines of space was obtained, and its point of intersection is the spatial coordinate.

scholarly journals Research on RTK tilt position measurement method based on UKF

2019 ◽  
Vol 13 (12) ◽  
pp. 2102-2106
Author(s):  
Bo Nie ◽  
Guiming Chen ◽  
Bingqi Liu
Keyword(s):  
Measurement Method ◽  
Position Measurement
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