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    Wyświetlanie 1-8 z 8
    Tytuł:
    Evaluation of some levelling techniques in surveying application
    Autorzy:
    Pirti, Atinc
    Hosbas, Ramazan Gürsel
    Powiązania:
    https://bibliotekanauki.pl/articles/145555.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    poziomowanie
    GPS
    wysokość
    levelling
    accuracy
    height
    precision
    Opis:
    Applications in geodesy and engineering surveying require the determination of the heights of the vertical control points in the national and local networks using different techniques. These techniques can be classified as geometric, trigonometric, barometric and Global Positioning System (GPS) levelling. The aim of this study is to analyse height differences obtained from these three techniques using precise digital level and digital level, total station (trigonometric levelling) and GPS which collects phase and code observations (GPS levelling). The accuracies of these methods are analysed. The results obtained show that the precise digital levelling is more stable and reliable than the other two methods. The results of the three levelling methods agree with each other within a few millimetres. The different levelling methods are compared. Geometric levelling is usually accepted as being more accurate than the other methods. The discrepancy between geometric levelling and short range trigonometric levelling is at the level of 8 millimetres. The accuracy of the short range trigonometric levelling is due the reciprocal and simultaneous observations of the zenith angles and slope distances over relative short distances of 250 m. The difference between the ellipsoidal height differences obtained from the GPS levelling used without geoid and the orthometric height differences obtained from precise geometric levelling is 4 millimetres. The geoid model which is obtained from a fifth order polynomial fit of the project area is good enough in this study. The discrepancy between the precise geometric and GPS levelling (with geoid corrections) is 4 millimetres over 5 km.
    Źródło:
    Geodesy and Cartography; 2019, 68, 2; 361-373
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of correlation coefficient between geoid-to-quasigeoid separation calculated by the satellite data in Sjöberg’s equation and GPS/Levelling method
    Autorzy:
    Eshaghzadeh, A.
    Kalantari, R. A.
    Hekmat, Z. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/145523.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geoida
    GPS
    poziomowanie
    geoid
    GPS levelling
    ICGEM
    quasigeoid
    Sjöberg’s equation
    Opis:
    In this paper, two techniques for calculating the geoid-to-quasigeoid separation are employed. One of them is GPS/Levelling customary method as a criterion where the geoid undulation and height anomaly are computed by subtracting the ellipsoid height attained via GPS from the orthometric height and normal height, respectively. Another approach is Sjöberg’s equation. We have used of the ICGEM website for definition of the variables of the Sjöberg’s equation, as the applied reference model is the EGM2008 global geopotential model and WGS84 reference ellipsoid. The investigations are performed over the stations of the GPS/Leveling network related to three selected areas in desert, mountain and flatland namely the Lout, Zagros and Khuzestan in Iran and afterward the correlation coefficient between the geoid-to-quasigeoid separation calculated using the satellite data in Sjöberg’s equation and GPS/Levelling method is estimated. The results indicate a straight correlation between the estimated separations from the two methods as its value for the Lout is 0.754, for the Zagros is 0.497 and for the Khuzestan is 0.659. consequently, using the satellite data in Sjöberg’s equation for the regions where there are not the GPS/Levelling and land gravity data, specially for the even areas, yield a satisfactory response of the geoidto-quasigeoid separation.
    Źródło:
    Geodesy and Cartography; 2018, 67, 2; 179-192
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metodyka postępowania przy wprowadzaniu poziomowanej produkcji
    Creation of repeatable production plan
    Autorzy:
    Rewers, P.
    Hamrol, A.
    Żywicki, K.
    Chabowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/339931.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Zarządzania Produkcją
    Tematy:
    poziomowanie produkcji
    planowanie produkcji
    wskaźnik EPEI
    production leveling
    EPEI
    production plan
    Opis:
    This article presents an original methodology of implementation of repeatable production plan. After analyzing the available literature, both Polish and world, and their own thoughts, it was found that the available methods of implementation production leveling are imprecise or difficult to implement in real conditions. Accordingly, an attempt was made creation of such to the methodology that would be simple to implement the in enterprises. The methodology consists of six steps procedure. The first step is to choose products which will be implemented leveled production. For this purpose uses a sieve Glenday. Sieve Glenday allows it to designate products made of green group that is, those that are most commonly sold. The next step is the division of products families, according to the similarity criterion of technological products. For this purpose uses matrix similarity technological products. The third step is the analysis of customer orders for products from the green group. For this purpose to be determined the average weekly sales of products. Then, on the basis of the forecast is calculated weekly forecast accuracy. This step is particularly important to the company so far has proven demand fluctuations and verifiability forecasts. The fourth step is to determine the frequency of repetitions production products. This is done using EPEI gauge, which informs how often it is possible to produce the next sequence products.. The next step is determining the volume of stocks: cycle, buffer, safety in the warehouse of finished products. In the production leveling it said that the store is called. Supermarket different from the traditional magazine primarily that is always retained FIFO. The last step is to create reproducible production plan. To check the leveling of production to be determined gauges the effectiveness of the leveling of production, for example volume of stocks, production capacity, etc. Evaluation of effectiveness of the leveling of production is particularly important because it helps determine whether production leveling brought the desired effect or not. Presented in the article the methodology is under development. The next step of the work will attempt to test the methodology in real conditions in the enterprise.
    Źródło:
    Zarządzanie Przedsiębiorstwem; 2016, 19, 3; 22-30
    1643-4773
    Pojawia się w:
    Zarządzanie Przedsiębiorstwem
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projekt elektrycznego wózka inwalidzkiego o zmiennej geometrii ramy
    The project of electric wheelchair with changeable chassis geometry
    Autorzy:
    Tejszerska, D
    Warszawa, P
    Jureczko, P
    Powiązania:
    https://bibliotekanauki.pl/articles/99061.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    wózek inwalidzki
    analiza numeryczna
    pionizacja
    poziomowanie
    wheelchair
    numerical analysis
    verticalisation
    leveling
    Opis:
    W pracy został przedstawiony projekt geometrii elektrycznego wózka inwalidzkiego ze zmienną geometrią ramy, umożliwiającą pionizację oraz uzyskanie pozycji leżącej. Wykonana została analiza numeryczna konstrukcji.
    The project of multi-positional electric wheelchair for handicapped people. The geometric model have been designed and analyzed with use of Autodesk Inventor environment.
    Źródło:
    Aktualne Problemy Biomechaniki; 2010, 4; 269-274
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Test of Vibrations Influence on the Measurement Accuracy in the Precise Digital Leveller Trimble Dini 03 And Comparison of its Vibration Sensitivity with Leveller Ni 002
    Autorzy:
    Kurnatowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/1838066.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    vibrations
    measurement accuracy
    precise levelling
    leveller digital
    drgania
    dokładność pomiaru
    poziomowanie
    niwelator cyfrowy
    Opis:
    The article presents findings from research on the effect of vibrations on the accuracy of measurement with an automatic precise digital leveller. A special research station was created to induce vibrations on a leveller and to measure vibration parameters that affect staff reading. It contains description of discovered relationship between the vibration parameters and the mean error of a single height difference measurement. The range of frequencies for which the measurement was possible was estimated. The reliability of the measured values obtained under specific vibration conditions was also analysed. The results of current research were compared with similar studies on analogue leveller Ni 002. The conclusions described in this paper can be helpful in engineering measurements under adverse conditions of ambient vibrations.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 4; 112-124
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Validation of European Gravimetric Geoid models in context of realization of EVRS system in Poland
    Autorzy:
    Marjańska, Dorota
    Olszak, Tomasz
    Piętka, Dominik
    Powiązania:
    https://bibliotekanauki.pl/articles/145553.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model quasi-geoidy
    anomalia wysokości
    poziomowanie
    quasi-geoid model
    height frame
    height anomaly
    GNSS/levelling
    Opis:
    In this study, several variants create and choose of a local quasi-geoid model in Poland have been considered. All propositions have a source in European Gravimetric Geoid models – EGG2008 and EGG2015, which are purely gravimetric models of reference surface. In the course of this work, each model has been analyzed in various ways: without any corrections, by parallel shifting of residuals, by the 7-parameter conformal transformation and by fitting residuals by 4- and 5-parameter trigonometric polynomials. Eventual corrections were based on points of national GNSS/levelling networks (EUVN, EUVN_DA, POLREF, EUREF and ASG-EUPOS eccentric points). As a final result of this study, a comparison of the accuracy of selected models has been carried out by RMSE statistics and maps showing spatial distribution of residuals and histograms. Validation has shown that the maximum achievable accuracy of the EGG models is approximately 2 cm for the ETRF2000 reference system and approximately 8 cm for ETRF89. In turn, fitting with the use of different mathematical methods results in an improvement of the standard deviation of residues to the level of 1.3–1.4 cm. The conclusions include an evaluation of considerations for and against the use of models based only on EGG realizations and, on the other hand, fitted to the points of Polish vertical network. Its usefulness is strictly connected with needs of the definition of up to date quasi-geoid model for the new realization of heights system in Poland, based on EVRF2007 frame.
    Źródło:
    Geodesy and Cartography; 2019, 68, 2; 329-347
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prospects of metrological provision linear geodetic of measurements on the geodetic test field
    Autorzy:
    Trevoho, I. S.
    Tsyupak, I. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/224630.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    metrologia geodezyjna
    obserwacje GNNS
    poziomowanie GNNS
    sieci geodezyjne
    geodesic metrology
    working of standards
    test line of the geodetic basis
    fundamental geodetic network
    GNSS observations
    GNSS leveling
    Opis:
    This paper gives brief information on existing metrological support for the Yavoriv of scientific of the geodetic of test field (SGTF) for testing of modern of surveying equipment (rangefinders, electronic total stations and GNSS receivers). Analyzed ways to improve the fundamental geodetic network and the standard linear of basis, as working standards for testing, in accordance, GNSS receivers and a rangefinders, as well as for study an accuracy technology of GNSS leveling.
    Źródło:
    Reports on Geodesy; 2013, z. 1/94; 56-63
    0867-3179
    Pojawia się w:
    Reports on Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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