Theoretical aspects of the calibration of geodetic angle measurement instrumentation

Bručas, Domantas; Šiaudinytė, Lauryna; Rybokas, Mindaugas; Grattan, K. T. V.

doi:10.5755/j01.mech.20.1.6590

Cited by 5 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fuel consumption (l or l h -1 ) was measured by AIC-4004 VERITAS (AIC SYSTEMS AG) fuel flow meter. Calibration of all devices was performed according to standard procedures (Barzdžiukas, Augutis, & Žilinskas, 2012;Bručas, Šiaudinytė, Rybokas, & Grattan, 2014;Naranjo, Sandu, Taheri, & Taheri, 2014). Error did not exceed ±2%.…”

Section: Equipment Site and Layoutmentioning

confidence: 99%

Influence of Extra Weight and Tire Pressure on Fuel Consumption at Normal Tractor Slippage

Damanauskas¹,

Janulevičius²,

Pupinis³

2015

JAS

View full text Add to dashboard Cite

Tire pressure and wheel load are both easily managed parameters which play a significant role in tillage operations for limiting slip which involves energy loss. To a great extent, this aspect affects the fuel consumption and the time required for soil tillage. The study was focused on the tire pressure and extra weight variation effect on fuel consumption and work productivity for soil tillage at normal tractor wheels slippage (7-15%). The experimental research unit composed of an 82.3 kW 4WD tractor and a reversible 4-bodies plough is presented. Tests were carried out on a stubble loam, where slip of tractor driving wheels was  15%, tractor front ballast mass was varied in the range from 0 to 520 kg and inflation pressure in the tires from 240 kPa to 100 kPa. Dependences of tractor performance indicators on ballast mass and tires inflation pressure are presented. When tractor tire slip varies in the range from 7 to 15 percent (which is normal slip in the soil), reducing the tires inflation pressure decreases the driving wheel slip and fuel consumption, while increases work productivity. Increasing the additional mass of the tractor (adding ballast weights) decreases the driving wheel slip, increases work productivity, but also increases fuel consumption and soil compaction.

show abstract

Section: Equipment Site and Layoutmentioning

confidence: 99%

Influence of Extra Weight and Tire Pressure on Fuel Consumption at Normal Tractor Slippage

Damanauskas¹,

Janulevičius²,

Pupinis³

2015

JAS

View full text Add to dashboard Cite

show abstract

“…The method for calibration of vertical angle measuring systems of geodetic instruments was developed at Institute of Geodesy of Vilnius Gediminas Technical University. This method proposes an arrangement to create the reference angle suitable for vertical angle calibration purposes in the laboratory environment [3,4].…”

Section: The Principle and Instrumentationmentioning

confidence: 99%

Uncertainty evaluation of trigonometric method for vertical angle calibration of the total station instrument

Šiaudinytė

Grattan

2016

Measurement

View full text Add to dashboard Cite

The total station is an instrument, widely used in civil and environmental engineering, for flat and vertical angle as well as distance measurements. Typically, routine calibration of such an instrument is obligatory, and depending on the local regulations, is performed typically annually or biannually. Analysis of previous research shows that undertaking flat angle calibration under laboratory conditions is more common than calibration of vertical angle measuring systems. This paper deals with a trigonometric vertical angle calibration method and research into determining the main sources of uncertainty is described in the paper. The principle of the method is explained, as well as the uncertainty evaluation based on GUM and the advantages as well as the weaknesses of the setup are discussed.

show abstract

“…A range of vertical angle sensors and instruments, including electronic levels, inclinometers, theodolites, and total stations, are employed for this purpose [1][2][3][4][5][6][7][8][9]. Proper calibration of these sensors and instruments is crucial to ensure high reliability and improve measurement accuracy [10][11][12][13][14]. Consequently, several National Measurement Institutes have developed standard angle comparators and offer calibration services for vertical angle sensors and instruments.…”

Section: Introductionmentioning

confidence: 99%

“…A comparison of technical specifications of various angle measuring methods applicable to geodetic angle measurement instruments was conducted. Horizontal angles of a total station were evaluated using a precision rotary table, while vertical angles were assessed using a trigonometric method [12]. Another method utilized an index table and an autocollimator to calibrate the vertical angle of a total station [13].…”

Section: Introductionmentioning

confidence: 99%

High precision vertical angle measurement system for calibration of various angle sensors and instruments

Kim,

Lee,

Kang

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

A versatile measurement system was developed for efficient calibration of vertical angle sensors or instruments. The vertical angle measurement system (VAMS) comprises a precision rotation stage, a controller, and additional components for fixing an angle sensor or detecting angular deviation. It can generate single-axis rotation within ±120° range with a resolution of 0.01”. To detect angular deviation in angle instrument calibration, a special miniature autocollimator was developed using a diffractive optical element, providing high-precision angle measurement even with the short focal length of its lens. The performance of the VAMS was evaluated by comparing face angles of two optical polygons, measured by the VAMS and other reference systems. As typical exemplary calibrations, an electronic level and vertical angle readouts of a total station were calibrated with expanded uncertainty (k = 2) of 0.19” and 0.51”, respectively.

show abstract

Theoretical aspects of the calibration of geodetic angle measurement instrumentation

Cited by 5 publications

References 6 publications

Influence of Extra Weight and Tire Pressure on Fuel Consumption at Normal Tractor Slippage

Influence of Extra Weight and Tire Pressure on Fuel Consumption at Normal Tractor Slippage

Uncertainty evaluation of trigonometric method for vertical angle calibration of the total station instrument

High precision vertical angle measurement system for calibration of various angle sensors and instruments

Contact Info

Product

Resources

About