Single-beam high-accuracy longitudinal position measurement using spiralling beams

Autonomous posture detection and self-localization of roadheaders is the key to automatic tunneling and roadheader robotization. In this paper, a multi-sensor based positioning method, involving an inertial system for altitude angles measurement, total station for coordinate measurement, and sensors for measuring the real-time length of the hydraulic cylinder is presented for roadheader position measurement and posture detection. Based on this method, a positioning model for roadheader and cutter positioning is developed. Additionally, flexible trajectory planning methods are provided for automatic cutting. Based on the positioning model and the trajectory planning methods, an automatic cutting procedure is proposed and applied in practical tunneling. The experimental results verify the high accuracy and efficiency of both the positioning method and the model. Furthermore, it is indicated that arbitrary shapes can be generated automatically and precisely according to the planned trajectory, employing the automatic cutting procedure. Therefore, unmanned tunneling can be realized by employing the proposed automatic cutting process.

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High-accuracy Single-beam Sounding Using Small Bandwidth and Rough Sound Speed

10.1109/coa50123.2021.9519879 ◽

2021 ◽

Author(s):

Xionghou Liu ◽

Yanhua Li ◽

Shulei Lan

Keyword(s):

Sound Speed ◽

High Accuracy ◽

Single Beam ◽

Small Bandwidth

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The Development of Initial Position End-of-Line Test System for PMSM

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1061-1062.995 ◽

2014 ◽

Vol 1061-1062 ◽

pp. 995-998

Author(s):

Yan Ling Cao ◽

Ping Cao

Keyword(s):

Full Range ◽

High Accuracy ◽

Test System ◽

Initial Position ◽

Position Measurement ◽

Zero Crossing ◽

The North ◽

Line Test ◽

And Performance ◽

Crossing Point

The resolver is widely used in the production applications due to the robust mounting and high accuracy at full range. However, the mounting accuracy of such sensors will significantly limit the torque accuracy and performance if the initial positions are not calibrated at the end-of-line (EOL) test. An initial position EOL test system is designed base on the production requirements. A simple initial position measurement method is introduced and applied to the PMSM motor, which measures the back EMF and the North mark (NM) signal of the resolver. The time difference between the back EMF zero crossing point and NM signal is divided by the back EMF period and then the initial position is calculated. The method is validated on the target bench and experiments prove the EOL test system is suit for the mass production.

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Review : Bathymetry Mapping Using Underwater Acoustic Technology

Journal of Geoscience Engineering Environment and Technology ◽

10.25299/jgeet.2019.4.2.3127 ◽

2019 ◽

Vol 4 (2) ◽

pp. 135

Author(s):

Muhammad Zainuddin Lubis ◽

Sri Pujiyati ◽

Budhi Agung Prasetyo ◽

Tiggi Choanji

Keyword(s):

Real Time ◽

High Accuracy ◽

Parallel Patterns ◽

Underwater Acoustic ◽

Multibeam Echosounder ◽

Single Beam ◽

Accuracy And Precision ◽

Multibeam Echosounder System ◽

Bathymetric Map

The bathymetry mapping using underwater acoustic technology very important in Indonesia waters. Bathymetry is the result of measuring the height of the seabed so that the bathymetric map provides information about the seabed, where this information can provide benefits to several fields related to the seabed. In bathymetry mapping uses underwater acoustic technology where among them is using Single beam echosounder and MBES (Multibeam Echosounder System), and multibeam echosounder (MBES) is acoustic equipment that is intensively used frequently in basic waters mapping. The advantage of using underwater acoustic technology is the acquisition and processing of data in real time, high accuracy and precision (correction of the bathymetry data was carried out with reference to the 2008 International Hydrographic Organization (IHO), and cannot be a threat or damage to objects. Retrieval of bathymetry data must use parallel patterns, namely: patterns with perpendicular sounding directions and tend to be parallel to longitudinal lines or in accordance with parallel sounding patterns.

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High Accuracy Slit-Ray Position Measurement

Journal of Engineering for Industry ◽

10.1115/1.3187849 ◽

1988 ◽

Vol 110 (1) ◽

pp. 92-94 ◽

Cited By ~ 3

Author(s):

Y. Nomura ◽

H. Naruse ◽

T. Morimitsu

Keyword(s):

Regression Analysis ◽

Error Analysis ◽

Image Plane ◽

High Accuracy ◽

Shape Measurement ◽

Position Measurement

The accuracy of slit-ray position measurement on an image plane of a TV camera is improved to the order of one-hundredth of pixel spacing by a regression analysis and an error analysis. Also, the effectiveness of the method is confirmed by means of shape measurement experiments.

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