A Study on the Effect of Excitation Coil System To Improve Measurement Accuracy of Electromagnetic Flowmeter on the Ship

2021 ◽  
Vol 70 (10) ◽  
pp. 1460-1466
Author(s):  
Sang Hyeon Im ◽  
Kyung Youn Kim ◽  
Gwan Soo Park
Keyword(s):  
Measurement Accuracy ◽  
Electromagnetic Flowmeter ◽  
Coil System ◽  
Improve Measurement ◽  
Excitation Coil

scholarly journals Effectiveness of Variable-Gain Kalman Filter Based on Angle Error Calculated from Acceleration Signals in Lower Limb Angle Measurement with Inertial Sensors

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Yuta Teruyama ◽  
Takashi Watanabe
Keyword(s):  
Kalman Filter ◽  
Lower Limb ◽  
Measurement Accuracy ◽  
Inertial Sensors ◽  
Angle Measurement ◽  
Angle Error ◽  
Variable Gain ◽  
Improve Measurement ◽  
Kalman Gain ◽  
Acceleration Signals

The wearable sensor system developed by our group, which measured lower limb angles using Kalman-filtering-based method, was suggested to be useful in evaluation of gait function for rehabilitation support. However, it was expected to reduce variations of measurement errors. In this paper, a variable-Kalman-gain method based on angle error that was calculated from acceleration signals was proposed to improve measurement accuracy. The proposed method was tested comparing to fixed-gain Kalman filter and a variable-Kalman-gain method that was based on acceleration magnitude used in previous studies. First, in angle measurement in treadmill walking, the proposed method measured lower limb angles with the highest measurement accuracy and improved significantly foot inclination angle measurement, while it improved slightly shank and thigh inclination angles. The variable-gain method based on acceleration magnitude was not effective for our Kalman filter system. Then, in angle measurement of a rigid body model, it was shown that the proposed method had measurement accuracy similar to or higher than results seen in other studies that used markers of camera-based motion measurement system fixing on a rigid plate together with a sensor or on the sensor directly. The proposed method was found to be effective in angle measurement with inertial sensors.

Research on Data Aggregation Algorithms Based on OPT in Wireless Sensor Networks

2013 ◽  
Vol 427-429 ◽  
pp. 1991-1994
Author(s):  
Xue Wen He ◽  
Le Ping Zheng ◽  
Kuan Gang Fan ◽  
Sun Han ◽  
Qing Mei Cao
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Data Aggregation ◽  
Measurement Accuracy ◽  
Wireless Sensor ◽  
Data Traffic ◽  
Fusion Model ◽  
Design Goal ◽  
Improve Measurement ◽  
Battery Energy

Since wireless sensor networks consist of sensors with limited battery energy, a major design goal is to maximize the lifetime of sensor network. To improve measurement accuracy and prolong network lifetime, reducing data traffic is needed. In the clustering-based wireless sensor networks, a novel data aggregation algorithm based on OPT and Layida Method is proposed. In the proposed method, Layida Method preprocesses data and data fusion model for data integration are used. Its availability is proved by comparing with the results of two existing algorithms.

scholarly journals The Effect of Deflections and Elastic Deformations on Geometrical Deviation and Shape Profile Measurements of Large Crankshafts with Uncontrolled Supports

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5714
Author(s):  
Krzysztof Nozdrzykowski ◽  
Stanisław Adamczak ◽  
Zenon Grządziel ◽  
Paweł Dunaj
Keyword(s):  
Correlation Analysis ◽  
Quantitative Assessment ◽  
Measurement Accuracy ◽  
Qualitative Comparison ◽  
Elastic Deformations ◽  
Point Support ◽  
Improve Measurement ◽  
Amplitude Spectra ◽  
Geometric Deviations ◽  
Multi Criteria Analysis

This article presents a multi-criteria analysis of the errors that may occur while measuring the geometric deviations of crankshafts that require multi-point support. The analysis included in the paper confirmed that the currently used conventional support method—in which the journals of large crankshafts rest on a set of fixed rigid vee-blocks—significantly limits the detectability of their geometric deviations, especially those of the main journal axes’ positions. Insights for performing practical measurements, which will improve measurement procedures and increase measurement accuracy, are provided. The results are presented both graphically and as discrete amplitude spectra to make a visual, qualitative comparison, which is complemented by a quantitative assessment based on correlation analysis.

scholarly journals Thermal properties of thin films made from MoS2 nanoflakes and probed via statistical optothermal Raman method

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Arkadiusz P. Gertych ◽  
Anna Łapińska ◽  
Karolina Czerniak-Łosiewicz ◽  
Anna Dużyńska ◽  
Mariusz Zdrojek ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Thermal Properties ◽  
Measurement Accuracy ◽  
Deep Understanding ◽  
Gaussian Laser Beam ◽  
Large Area ◽  
Heat Management ◽  
Improve Measurement ◽  
Stability Issues

Abstract A deep understanding of the thermal properties of 2D materials is crucial to their implementation in electronic and optoelectronic devices. In this study, we investigated the macroscopic in-plane thermal conductivity (κ) and thermal interface conductance (g) of large-area (mm2) thin film made from MoS2 nanoflakes via liquid exfoliation and deposited on Si/SiO2 substrate. We found κ and g to be 1.5 W/mK and 0.23 MW/m2K, respectively. These values are much lower than those of single flakes. This difference shows the effects of interconnections between individual flakes on macroscopic thin film parameters. The properties of a Gaussian laser beam and statistical optothermal Raman mapping were used to obtain sample parameters and significantly improve measurement accuracy. This work demonstrates how to address crucial stability issues in light-sensitive materials and can be used to understand heat management in MoS2 and other 2D flake-based thin films.

Surface-positioned double-ring to improve traditional infiltrometer for measuring soil infiltration

Soil Research ◽  
2020 ◽  
Vol 58 (3) ◽  
pp. 314
Author(s):  
Jing Zhang ◽  
Shaopeng Li
Keyword(s):  
Hydraulic Conductivity ◽  
Measurement Accuracy ◽  
Soil Column ◽  
Saturated Hydraulic Conductivity ◽  
Experimental Results ◽  
Water Infiltration ◽  
Maximum Relative Error ◽  
Wetting Front ◽  
Double Ring ◽  
Improve Measurement

The installation of a traditional double-ring infiltrometer (DRI) into soil is difficult and time consuming. It results in reduced accuracy because of soil disturbance and water leakage along the gaps between the ring wall and the soil. In this study, a surface-positioned DRI (SPDRI) was suggested to improve measurement accuracy and convenience of the DRI. Laboratory experiments were conducted to evaluate performance of the method in terms of the influence of the lateral flow of water on the accuracy of infiltration rate, average vertical wetting front depth and saturated hydraulic conductivity. A cylindrical soil column was used to simulate the ideal ring infiltrometer (IRI) of the one-dimensional vertical infiltration process for comparison purposes. Experimental results indicated that the infiltration rates measured by the SPDRI and IRI were nearly identical, with maximum relative error (RE) of 18.75%. The vertical wetting front depth of the SPDRI was nearly identical to that of the IRI, with proportional coefficients of 0.97 and R2 > 0.95. Comparison of the soil saturated hydraulic conductivity with those from IRI indicated that the REs were 7.05–10.63% for the SPDRI. Experimental results demonstrated that the SPDRI could improve the measurement accuracy and facilitate the soil water infiltration measurement process.

Size-Sorting and Measurement System of Safety Belt Pin Based on Machine Vision

2015 ◽  
Vol 741 ◽  
pp. 709-713 ◽  
Author(s):  
Li Gang Cao ◽  
Ming Xiang ◽  
Hao Feng ◽  
Yong Yu Wang
Keyword(s):  
Machine Vision ◽  
Measurement Accuracy ◽  
Image Process ◽  
Control Logic ◽  
Safety Belt ◽  
Repeatability Error ◽  
Improve Measurement ◽  
Size Sorting ◽  
Sorting System ◽  
Telecentric Lens

To improve measurement accuracy of safety belt pin, the size-sorting system which mainly includes a machine vision subsystem and a driving subsystem, is researched. The machine vision subsystem includes a industry camera, a double telecentric lens and a backlight. Image process steps that have sub-pixel accuracy are presented. The driving subsystem is designed with Atmega128L MCU. The state machine is designed for safety pin control logic. The two sub systems communicate with RS232 serial port. The test shows that the system has a maximum accuracy error of 0.05mm, repeatability error of 0.013mm.

On the Use of Rotor-Bearing Instability Thresholds to Accurately Measure Bearing Rotordynamic Properties

1985 ◽  
Vol 107 (4) ◽  
pp. 404-409 ◽  
Author(s):  
M. L. Adams ◽  
M. Rashidi
Keyword(s):  
Measurement Accuracy ◽  
Orbital Motion ◽  
Coordinate Systems ◽  
Rotordynamic Coefficients ◽  
Improve Measurement ◽  
Dynamic Forces ◽  
Rotor Bearing ◽  
Bearing Stiffness ◽  
Negative Damping ◽  
Two Degree Of Freedom

A re-examination of rotor-bearing instability has led to a fresh approach that can potentially improve measurement accuracy of journal bearing rotordynamic coefficients. The approach uses a two-degree-of-freedom system and has three major parts. First, bearing stiffness coefficients are measured using static loading. Second, measured orbital motion at an adjustable threshold speed is used to extract the bearing damping coefficients by inverting the associated Eigen problem. Third, multiple displacement-measurement coordinate systems are used to allow an averaging approach which uses to advantage the tensor transformation property of bearing rotordynamic coefficients. The fundamental advantages of the overall approach stem from the physical requirement for an exact internal energy balance between positive and negative damping influences at an instability threshold, and that it does not require the measurement of dynamic forces.

High Precision Mass Measurement in Automation

2010 ◽  
Vol 164 ◽  
pp. 19-24
Author(s):  
Tatjana Ivanova ◽  
Janis Rudzitis
Keyword(s):  
High Precision ◽  
Measurement Accuracy ◽  
Mass Measurement ◽  
Science And Technology ◽  
Computer Programs ◽  
Measurement Equipment ◽  
Measurement Instruments ◽  
Improve Measurement ◽  
Precision Mass Measurement ◽  
Reporting Procedures

High-precision mass measurement equipment is required in some areas of science and technology. Physics, chemistry, pharmaceutics and high precision mechanics are common examples. In metrology, high-precision scales are used for verification and calibration of lower precision mass measurement equipment (weights and scales). Mass comparators are the most accurate mass measurement instruments available today. It is a special type of electronic scales designed to compare mass of two weights. They can be automatic or manual, with various measurement ranges and accuracy classes. This article discusses principles of operation of mass comparators and practice of high-precision mass measurement. There are special computer programs that can be used in conjunction with these instruments, which may significantly improve measurement accuracy (when mass comparator is controlled remotely) as well as simplify calculations and reporting procedures. This article describes one of these programs – ScalesNet32 – which can be used with mass comparators produced by Sartorius (Germany).

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