scholarly journals PRECISION TESTING TECHNIQUES FOR HIGH-PRECISION NAVIGATION EQUIPMENT OF DYNAMIC CONSUMERS. COMPOSITION AND MAIN CHARACTERISTICS

2021 ◽  
Vol 1 ◽  
pp. 3-19
Author(s):  
Irina A. Anikeeva ◽  
Ivan V. Anokhin ◽  
Vladimir S. Vdovin ◽  
Vadim F. Ivanov ◽  
Alexander P. Karpik ◽  
...  
Keyword(s):  
High Precision ◽  
Control Points ◽  
Test Results ◽  
Operational Conditions ◽  
Long Baseline ◽  
Use Of Technology ◽  
Testing Techniques ◽  
Gnss Measurements ◽  
Navigation Equipment ◽  
Precision Testing

The article provides a brief overview of the developed by the authors and approved methods of precision testing of various samples of NAP-V dynamic consumers and the main test results using these methods in various geographic, weather and operational conditions. One of the key advantages of the techniques is the use of technology for obtaining precision coordinates of control points by the method of long-baseline relative determinations and obtaining reference tracks of a dynamic consumer using the method of integer resolution of ambiguities of phase GNSS measurements.

scholarly journals A High-Precision Registration Technology Based on Bundle Adjustment in Structured Light Scanning System

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Jianying Yuan ◽  
Qiong Wang ◽  
Xiaoliang Jiang ◽  
Bailin Li
Keyword(s):  
High Precision ◽  
Large Scale ◽  
Structured Light ◽  
Bundle Adjustment ◽  
Scanning System ◽  
Control Points ◽  
Registration Method ◽  
Global Control ◽  
3D Data ◽  
Structured Light Scanning

The multiview 3D data registration precision will decrease with the increasing number of registrations when measuring a large scale object using structured light scanning. In this paper, we propose a high-precision registration method based on multiple view geometry theory in order to solve this problem. First, a multiview network is constructed during the scanning process. The bundle adjustment method from digital close range photogrammetry is used to optimize the multiview network to obtain high-precision global control points. After that, the 3D data under each local coordinate of each scan are registered with the global control points. The method overcomes the error accumulation in the traditional registration process and reduces the time consumption of the following 3D data global optimization. The multiview 3D scan registration precision and efficiency are increased. Experiments verify the effectiveness of the proposed algorithm.

Implementation for High-Precision and Non-Contact System for the Measurement of Crankshaft and Camshaft

2011 ◽  
Vol 301-303 ◽  
pp. 959-964 ◽  
Author(s):  
Da Lin Cheng ◽  
Yi Wang ◽  
Yong Jie Ren ◽  
Xue You Yang
Keyword(s):  
Standard Deviation ◽  
High Precision ◽  
Measurement System ◽  
General Structure ◽  
Contact System ◽  
Scanning Laser ◽  
Test Results ◽  
Line Measurement ◽  
On Line ◽  
High Depth

A novel crankshaft and camshaft measurement system by optoelectronic scanning of which a flat-crystal was used to generate high depth of parallelism scanning laser was implemented. The general structure and principle were given. Mass of test results showed that the system could achieve high precision. The ranges could achieve ±8μm, standard deviation could achieve 3μm, and easy to operate, work reliably, automatically and on line measurement could be implemented.

scholarly journals Implementasi Usability Testing dalam Evaluasi Website Sekolah

2020 ◽  
Vol 9 (3) ◽  
pp. 420-426
Author(s):  
Susan Dian Purnamasari ◽  
Firamon Syakti
Keyword(s):  
Information Technology ◽  
Data Analysis ◽  
Data Collection ◽  
Usability Testing ◽  
The Internet ◽  
Test Results ◽  
Testing Techniques

One of the products of information technology that is common today is the school website. Where the school website is the spearhead for schools in disseminating information to related parties. The most important aspect of a website is the usability aspect because it greatly affects visitor convenience. The use of the website for disseminating information is also used by SMK Negeri Sumsel and the school's main portal on the internet. For that to see the importance of the usability aspect, this study aims to see the level of usability of the SMK Negeri Sumsel website. In measuring the level of usability, usability testing techniques are used with the stages of preparation, selecting respondents, data collection and data analysis. The test results show that the usability aspects on the website such as errors, learnability, memorability and satisfaction get good ratings while the efficiency aspects are not categorized as good.

scholarly journals The Deep Underground Neutrino Experiment

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Maury Goodman
Keyword(s):  
Neutrino Oscillation ◽  
High Precision ◽  
Liquid Argon ◽  
Neutrino Experiment ◽  
Research Facility ◽  
Long Baseline ◽  
The Status ◽  
Deep Underground ◽  
Fermi National Accelerator Laboratory ◽  
Sanford Underground Research Facility

The Deep Underground Neutrino Experiment (DUNE) is a worldwide effort to construct a next-generation long-baseline neutrino experiment based at the Fermi National Accelerator Laboratory. It is a merger of previous efforts and other interested parties to build, operate, and exploit a staged 40 kt liquid argon detector at the Sanford Underground Research Facility 1300 km from Fermilab, and a high precision near detector, exposed to a 1.2 MW, tunableνbeam produced by the PIP-II upgrade by 2024, evolving to a power of 2.3 MW by 2030. The neutrino oscillation physics goals and the status of the collaboration and project are summarized in this paper.

A Simple Procedure for the Prediction of the Collapse Pressure of Pipelines With Narrow and Long Corrosion Defects: Uncertainty and Sensibility Analysis

2018 ◽  
Author(s):  
Nara Oliveira ◽  
Theodoro Netto
Keyword(s):  
Simple Procedure ◽  
Experimental Tests ◽  
External Pressure ◽  
Experimental Program ◽  
Small Scale ◽  
Test Results ◽  
Collapse Pressure ◽  
Operational Conditions ◽  
Sensibility Analysis ◽  
Corrosion Defects

The collapse pressure of pipelines containing corrosion defects is usually predicted by deterministic methods, either numerically or through empirical formulations. The severity of each individual corrosion defect can be determined by comparing the differential pressure during operation with the estimated collapse pressure. A simple deterministic procedure for estimating the collapse pressure of pipes with narrow and long defects has been recently proposed by Netto (2010). This formulation was based on a combined small-scale experimental program and nonlinear numerical analyses accounting for different materials and defect geometries. However, loads and resistance parameters have uncertainties which define the basic reliability problem. These uncertainties are mailyrelated to the geometric and material parameters of the pipe and the operational conditions. This paper presents additional experimental tests on corroded pipes under external pressure. The collapse pressure calculated using the equation proposed by Netto (2010) is compared with this new set of experiments and also with test results available in open literature. These results are used to estimate the equation uncertainty. Finally, a sensitivity analysis is performed to identify how geometric parameters of the defects influence the reduction of collapse pressure.

scholarly journals Multiplicity of Galactic Cepheids from long-baseline interferometry

2019 ◽  
Vol 622 ◽  
pp. A164 ◽  
Author(s):  
A. Gallenne ◽  
P. Kervella ◽  
S. Borgniet ◽  
A. Mérand ◽  
G. Pietrzyński ◽  
...  
Keyword(s):  
High Precision ◽  
Radial Velocities ◽  
Single Line ◽  
Radial Pulsation ◽  
Mass Measurements ◽  
Long Baseline ◽  
Car T ◽  
Term Objective ◽  
Better Than

Aims. We aim at detecting and characterizing the main-sequence companions of a sample of known and suspected Galactic binary Cepheids. The long-term objective is to accurately and independently measure the Cepheid masses and distances. Methods. We used the multi-telescope interferometric combiners CHARA/MIRC and VLTI/PIONIER to detect and measure the astrometric positions of the high-contrast companions orbiting 16 bright Galactic Cepheids. We made use of the CANDID algorithm to search for the companions and set detection limits from interferometric observations. We also present new high-precision radial velocity measurements which were used to fit radial pulsation and orbital velocities. Results. We report the detection of the companions orbiting the Cepheids U Aql, BP Cir, and S Mus, possible detections for FF Aql, Y Car, BG Cru, X Sgr, V350 Sgr, and V636 Sco, while no component is detected around U Car, YZ Car, T Mon, R Mus, S Nor, W Sgr, and AH Vel. For U Aql and S Mus, we performed a preliminary orbital fit combining their astrometric measurements with newly obtained high-precision single-line radial velocities, providing the full set of orbital elements and pulsation parameters. Assuming the distance from a period-luminosity (P-L) relation for both Cepheids, we estimated preliminary masses of MU Aql = 4.97 ± 0.62 M⊙ and MS Mus = 4.63 ± 0.99 M⊙. For YZ Car, W Sgr, V350 Sgr, and V636 Sco, we revised the spectroscopic orbits using new high-precision radial velocities, while we updated the pulsation parameters for BP Cir, BG Cru, S Nor, and AH Vel. Our interferometric observations also provide measurements of the angular diameters, which can be used in a Baade-Wesselink type analysis. Conclusions. We now have several astrometric detections of Cepheid companions. When radial velocities of the companions are available, such systems will provide accurate and independent masses and distances. Orbital parallaxes with an accuracy better than 5% will be particularly useful for a better calibration of the P-L relation. The final Gaia parallaxes will also be particularly helpful for single-line spectroscopic systems, where mass and distance are degenerate. Mass measurements are necessary for a better understanding of the age and evolution of Cepheids.

scholarly journals High Precision, Small Size and Flexible FBG Strain Sensor for Slope Model Monitoring

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2716 ◽  
Author(s):  
Hongbin Xu ◽  
Xinyu Zheng ◽  
Weigang Zhao ◽  
Xu Sun ◽  
Feng Li ◽  
...  
Keyword(s):  
High Precision ◽  
Strain Sensor ◽  
Horizontal Displacement ◽  
Steel Plates ◽  
Flexible Structure ◽  
Test Results ◽  
Bending Angle ◽  
Subsurface Deformation ◽  
Measurement Results ◽  
Sensor Monitoring

In this paper, a soft fiber Bragg grating (FBG) strain sensor was constructed of a rubber strip, FBGs and steel plates, which exhibits the advantages of high precision and a small size. A series of FBGs was uniformly pasted on a flexible rubber strip which can monitor the slope deformation by measuring the bending deformation of the rubber strip. Most notably, this sensor can be used to monitor horizontal displacement in the subsurface of the slope model. The relationships among the bending angle of the rubber strip, the strain of the rubber strip, and the subsurface deformation of the slope model were established. In addition, the subsurface deformation of the slope model can be obtained by the FBG strain sensor monitoring. Since a rigid-flexible structure was formed by uniformly pasting a series of steel plates on the other side of the rubber strip, the sensitivity of the FBG strain sensor was improved to be 1.5425 nm/°. The measurement results verify that the FBG strain sensor shows good performance, and the model test results demonstrate that the FBG strain sensor can be used for monitoring the subsurface deformation of the slope model.

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