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Wyszukujesz frazę "accuracy of measurements" wg kryterium: Temat

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    Tytuł:
    Usefulness assessment of standard measuring instruments installed on sea-going ships to perform energy measurements
    Autorzy:
    Górski, Z.
    Cwilewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/260338.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    standard measurement instrumentation
    ships
    accuracy of measurements
    Opis:
    The presented work is a contribution to discussion on usefulness of application of measurement instrumentation used on sea-going ships for energy measurement and scientific research purposes. Contemporary sea-going ships are equipped as a rule with up-to-date measurement instrumentation usually based on electronic data processing and computer technique. These authors have made many times use of such instruments in their research work. This way it was not necessary to install any special instruments, that significantly reduced measurement cost. In such cases to obtain a sufficient accuracy of measurements constitutes a crucial problem. In this paper was presented an analysis of measurement errors of some operational parameters of ship and its main propulsion system, elaborated within the frame of the KBN research project no. 9 T12D 033 17. Results of the analysis confirm usefulness of the standard measurement instrumentation installed on ships, and its sufficient accuracy.
    Źródło:
    Polish Maritime Research; 2007, 1; 23-27
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The attempt to use levelling rods for testing metric properties of surveying instruments, which are used for reflectorless distance measurements
    Autorzy:
    Świerczyńska, E.
    Kołakowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/106769.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    terrestrial laser scanning
    reflectorless measurements
    accuracy of measurements
    skanowanie laserowe naziemne
    pomiary bezlustrowe
    dokładność pomiarów
    Opis:
    This paper presents results of two experimental cycles of measurements performed with the use of the terrestrial laser scanner Z+F IMAGER 5006h and the reflectorless tacheometer Leica TPS 1202. These tests aimed at determination of metric properties of surveying instruments, which are used for reflectorless distance measurements and which are often applied to project the geometry of objects. In the course of research works issues influencing the reflection of a laser beam by the measured surface, as well as their influence on the data quality. In order to analyse metric properties of applied instruments, levelling rods were used as test fields of geometrically specified division. It was stated basing on the performed analyses, that the influence of the incidental angle of a laser beam on the accuracy of reflectorless measurements is included within the limits of the error of distance measurements of a given instrument. However, the uniform trend of increasing differences between measured values and the nominal value may be noticed, together with the increase of the incidental angle of the axis of collimation on the measured surface of the test field.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2014, 96; 38-54
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Matlab Package for External Local Calibration of IR Camera with Microbolometric FPA Detector
    Autorzy:
    Kruczek, T.
    Adamczyk, W.
    Kruczek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/114419.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    thermovision infrared measurements
    improvement of accuracy of infrared camera measurements
    Opis:
    This work presents the method of improving the accuracy of temperature measurement results obtained by means of long-wave infrared camera equipped with focal plane array (FPA) detector. The typical accuracy of infrared cameras specified by their manufacturers amounts to ±2 K or ±2% of the measured value of temperature. Very often a better accuracy of the measurements is required, e.g. during the measurements of human body temperature. To improve the measurement accuracy an external local (in terms of temperature range) correction of obtained results on the basis of comparison measurement results of black body temperature and next with use of MATLAB package has been proposed.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 10; 337-340
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Results of Non-Contact Coordinate Measurement of a Cutting Tool Applied for Mould Machining
    Autorzy:
    Bazan, Anna
    Magdziak, Marek
    Jamuła, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/11236770.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    cutting tools
    tool wear monitoring
    mould machining
    measuring technique
    non-contact measurements
    accuracy of measurements
    narzędzia skrawające
    zużycie narzędzi
    obróbka form
    technika pomiarowa
    pomiar bezkontaktowy
    dokładność pomiaru
    Opis:
    One of the main problems of machining of moulds is the need for an effective monitoring system of wear of cutting tools. This paper presents the results of coordinate measurements of a cutting tool which were obtained by using the non-contact measuring system based on the ACCURA II coordinate measuring machine equipped with the LineScan laser measuring probe and the Calypso metrology software. Investigations were carried out for several measurement strategies including different measurement resolutions and scanning speeds. The results of the coordinate measurements obtained by using the above-mentioned coordinate measuring system were compared to the reference data measured by means of the InfiniteFocus microscope. The measurement results were analysed by means of two software packages: Focus Inspection and Zeiss Reverse Engineering. The point clouds measured by using the LineScan probe were characterized by the selected deviation statistics equal to 4-6 μm when a good match between measurement points and the reference data was obtained. Moreover, these statistics mainly depend on the measurement resolution. The results of the performed experimental research allowed for drawing conclusions concerning the significance of the effect of the adopted measurement strategies on the results of the non-contact coordinate measurements of the selected cutting tool. The application of the non-contact coordinate measurements to the above-mentioned measurement task may contribute to the development of regeneration methods for cutting tools applied for mould manufacturing.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 121--127
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New approach to the accuracy description of unbalanced bridge circuits with the example of pt sensor resistance bridges
    Autorzy:
    Warsza, Z. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/385278.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    resistance bridge
    sensor
    measures of accuracy
    error
    uncertainty of measurements
    Opis:
    After short introduction transfer coefficients of the unloaded four arms bridge of arbitrary variable arm resistances, supplied by current or voltage source, are given in Table 1. Their error propagation formulas are find and two rationalized forms of accuracy measures, i.e. related to the initial bridge sensitivities and of double component form as sum of zero error and increment error of the bridge transfer coefficients are introduced. Both forms of transfer coefficient measures of commonly used bridge - of similar initial arm resistances in balance and different variants of their jointed increments, are given in Table 3. As the example limited errors of some resistance bridges with platinum Pt100 industrial sensors of class A and B are calculated Table 4 and analyzed. Presented approach is discussed and found as the universal solution for all bridges and also for any other circuits used for parametric sensors.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 2; 8-15
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Algorithms for improving the position determination of an UAV equipped with a single-frequency GPS receiver for low-altitude photogrammetry
    Autorzy:
    Krasuski, Kamil
    Wierzbicki, Damian
    Lalak, Marta
    Ciećko, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/27311750.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    UAV
    GNSS measurements
    linear elements of exterior orientation
    accuracy
    Opis:
    The article presents the results of research on the development of a method for improving the positioning accuracy of an UAV equipped with a single-frequency GPS receiver for determining the linear elements of exterior orientation in aerial photogrammetry. Thus, the paper presents a computational strategy for improving UAV position determination using the SPP code method and the products of the IGS service. The developed algorithms were tested in two independent research experiments performed with the UAV platform on which an AsteRx-m2 UAS single-frequency receiver was installed. As a result of the experiments, it was shown that the use of IGS products in the SPP code method made it possible to improve the accuracy of the linear elements to the level of about ±2.088 m for X coordinate, ±1.547 m for Y coordinate, ±3.712 m for Z coordinate. The paper also shows the trend of changes in the obtained accuracy in determining linear elements of exterior orientation in the form of a linear regression function. Finally, the paper also applies the SBAS corrections model for the improvement of UAV position calculation and determination of linear elements of exterior orientation. In this case, the improvement in the accuracy of determining the linear elements of exterior orientation is about ±1.843 m for X coordinate, ±1.658 m for Y coordinate, ±7.930 m for Z coordinate. As the obtained test results show, the use of IGS products and SBAS corrections in the SPP code method makes it possible to improve the determination of UAV positions for the use in aerial photogrammetry.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 3; 441--459
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining the Number of Measurements and Bootstrap Samples Required to Estimate of Long-Term Noise Indicators
    Autorzy:
    Stępień, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/1953547.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    bootstrap
    bootstrap replications
    long-term noise indicators
    number of measurements
    uncertainty
    accuracy
    Opis:
    The minimum size of the bootstrap algorithm input parameters have been determined for estimation of long-term indicators of road traffic noise. Two independent simulation experiments have been performed for that purpose. The first experiment served to determine the impact of original random sample size, and the second to determine the impact of number of the bootstrap replications on the accuracy and uncertainty of estimation of long-term noise indicators. The inference has been carried out based on results of non-parametric statistical test at significance level α = 0:05. The simulation experiments have shown that estimation of long-term noise indicators with uncertainty below ±1 dB(A) requires all-day noise measurements during three randomly selected days during the year in a dense urban development. The maximum size of original random sample should not exceed n = 50 elements. The minimum number of bootstrap replications necessary for estimation should be B = 5000. The data used to the simulation experiments and carry out the analysis were results of continuous monitoring of road traffic noise recorded in 2009 in one of the main arteries of Krakow in Poland.
    Źródło:
    Archives of Acoustics; 2020, 45, 4; 613-623
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accuracy of measuring small heeling angles of a ship using an inclinometer
    Autorzy:
    Naus, K.
    Wąż, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/135553.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    heel vessel
    angle measurements
    accuracy of measuring
    horizon line
    optical method
    inclinometer
    CCD camera
    Opis:
    This article describes studies that evaluate the accuracy of measuring a ship’s heeling angle with an inclinometer. It does so by comparing inclinometer readings with benchmark measurements made with the optical method. The first part of the article describes the measurement station used for gathering measurement data. This station included an inclinometer and a CCD camera, and was used to process digital images incorporating a horizon line to indicate the ship’s heeling angle. The second part of the article describes the data gathering process carried out on a ship at sea. The final part describes a statistical analysis which compares the angular measurements based on an inclinometer with simultaneous optical benchmark measurements.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 25-28
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence Of Propagation Environment On The Accuracy Of Emission Source Bearing
    Autorzy:
    Ziółkowski, C.
    Kelner, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220529.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DF
    methodology of bearing measurement
    bearing accuracy
    measurements in multipath environment
    power azimuth spectrum
    Opis:
    This paper focuses on the radio direction finding (DF) in multipath environments. Based on the measurement results presented in the open literature, the authors analyse the influence of environment transmission properties on the spread of the signal reception angle. Parameters that define these properties are rms delay and angle spreads. For these parameters, the mutual relationship is determined. This relationship is the basis for assessment of the required number of bearings that minimize the influence of the environment on the accuracy of DF procedure. In the presented analysis, the statistical properties of the signal reception angle are approximated by the normal distribution. The number of bearings versus the rms delay spread is presented as the main objective of this paper. In addition, a methodology of the bearings’ spatial averaging that provides better estimation of the reception angle is shown.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 4; 591-600
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The accuracy investigation of point coordinates’ determination using a fixed basis for high-precision geodesy binding
    Autorzy:
    Litynskyi, Volodymyr
    Litynskyi, Svyatoslav
    Vivat, Anatolii
    Fys, Mykhailo
    Brydun, Andrii
    Powiązania:
    https://bibliotekanauki.pl/articles/106849.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    optimization of linear-angular measurements
    linear-angular measurements
    coordinates determination
    accuracy of coordinates determination
    optymalizacja pomiarów liniowo-kątowych
    pomiary liniowo-kątowe
    określanie współrzędnych
    dokładność określenia współrzędnych
    Opis:
    Modern scanners can perform terrestrial topographic survey with resolution of 1 cm and accuracy of 2 mm in just a few minute‘s time, from the distance of up to 100 meters. However, for surface topographical surveying of large territories or complex industrial objects, it is necessary to conduct geodetic traverses and perform their binding to the points of the geodesic basis. One method of coordinate transferring during surveying is by using the method of inverse linear-angular intersection, which involves the measuring of the respective sides S1, S2 and the β angle between them. This method is more precise than the classical one, which usually contains centring and reduction errors. The linear-angular intersection method can also be used for many applications in engineering geodesy, for laying geodetic traverses, and for binding to the wall based points of ground-surveying.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2019, 107; 19-23
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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