Measurement and Calibration of the Displacement and Pressure in Automatic Wheelset Assembly Machine

This paper introduces the measurement systems of the oil cylinder in automatic wheelset assembly machine, theoretically analyzes the error of the displacement measurement system by curve fitting, and gets verification the error analysis in practice. This paper also calibrates pressure sensor from zero drift, slope of the output of the pressure sensor to guarantee the system pressure, and compensated pressure sensor value consistent.

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Error analysis and correction of grating interference displacement measurement system

10.1117/12.2014881 ◽

2013 ◽

Author(s):

Minlan Jiang ◽

Xinchao Lu ◽

Xiaodong Wang ◽

Xiuling Xu

Keyword(s):

Error Analysis ◽

Measurement System ◽

Displacement Measurement

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A Multi-Path Tolerant Displacement Measurement System Using Radio Wave Phase Differences

Seismic Engineering, Volume 1 ◽

10.1115/pvp2004-2921 ◽

2004 ◽

Cited By ~ 1

Author(s):

Nobuhiro Suzuki ◽

Tadashi Mikoshiba ◽

Atsushi Mogi

Keyword(s):

Radio Wave ◽

Measurement System ◽

Measurement Method ◽

Measurement Precision ◽

Displacement Measurement ◽

Experimental Results ◽

Radio Waves ◽

Measurement Systems ◽

Wave Phase ◽

Phase Differences

In quake-proof test facilities, multipoint displacement measurement systems are demanded to analyze quake-destroy mechanisms of structures. As a one of those systems, we have proposed a measurement method using radio wave phase differences. Observing carrier phases of radio waves from transmitters attached on measurement points, the displacement of measurement points can be measured. In this report, we propose an improved measurement method that uses redundant number of sensors to obtain multi-path tolerant capability. We will also report some new experimental results which show the proposed method has sub-centimeter measurement precision.

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Using A Segmented Voltage Sweep Mode and A Gaussian Curve Fitting Method to Improve Heavy Metal Measurement System Performance

Metrology and Measurement Systems ◽

10.2478/v10178-012-0033-8 ◽

2012 ◽

Vol 19 (2) ◽

pp. 381-394

Author(s):

José Pereira ◽

Octavian Postolache ◽

Pedro Girão

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Measurement System ◽

Curve Fitting ◽

System Performance ◽

Redox Potentials ◽

Voltage Sweep ◽

Gaussian Curve ◽

Fitting Method ◽

Curve Fitting Method

Using A Segmented Voltage Sweep Mode and A Gaussian Curve Fitting Method to Improve Heavy Metal Measurement System PerformanceThis paper presents a voltammetric segmented voltage sweep mode that can be used to identify and measure heavy metals' concentrations. The proposed sweep mode covers a set of voltage ranges that are centered around the redox potentials of the metals that are under analysis. The heavy metal measurement system can take advantage of the historical database of measurements to identify the metals with higher concentrations in a given geographical area, and perform a segmented sweep around predefined voltage ranges or, alternatively, the system can perform a fast linear voltage sweep to identify the voltammetric current peaks and then perform a segmented voltage sweep around the set of voltages that are associated with the voltammetric current peaks. The paper also includes the presentation of two auto-calibration modes that can be used to improve system's reliability and proposes the usage of a Gaussian curve fitting of voltammetric data to identify heavy metals and to evaluate their concentrations. Several simulation and experimental results, that validate the theoretical expectations, are also presented in the paper.

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Development of Thermal Performance Metrics for Direct Gas-Fired Circulating Heaters

Agriculture ◽

10.3390/agriculture11070588 ◽

2021 ◽

Vol 11 (7) ◽

pp. 588

Author(s):

Benjamin C. Smith ◽

Brett C. Ramirez ◽

Steven J. Hoff

Keyword(s):

Mass Flow ◽

Measurement System ◽

Thermal Efficiency ◽

Performance Metrics ◽

Standardized Test ◽

Flow System ◽

Standard Test ◽

Testing System ◽

Measurement Systems ◽

Selection Of

Many climate-controlled agricultural buildings use direct gas-fired circulating heaters (DGFCH) for supplement heat. There is no standardized test to calculate thermal efficiency for these heaters. This study aimed to develop a measurement system and analytical analysis for thermal efficiency, quantify the measurement uncertainty, and assess economics of DGFCH efficiency. The measurement system developed was similar to the ASHRAE 103 standard test stand with adaptations to connect the apparatus to the DGFCH. Two different propane measurement systems were used: input ratings < 30 kW used a mass flow system and input ratings > 30 kW used a volumetric gas meter. Three DGFCHs (21.9, 29.3, 73.3 kW) were tested to evaluate the system. Thermal efficiencies ranged from 92.4% to 100.9%. The resulting uncertainty (coverage factor of 2; ~95% Confidence Interval) ranged from 13.1% to 30.7% for input ratings of 56.3 to 11.4 kW. Key sources of uncertainty were propane and mass flow of air measurement. The economic impact of 1% difference in thermal efficiency ranged from USD $61.3 to $72.0 per heating season. Refinement of the testing system and procedures are needed to reduce the uncertainty. The application of this system will aid building designers in selection of DGFCHs for various applications.

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