Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Calibration of Weigh-In-Motion systems - metrological assessment of methods for determining reference values

Sroka Ryszard, Gajda Janusz, Burnos Piotr, Daniol Mateusz, Kania-Markocka Anna, Slusarski Wiktor, Ziolkowski Robert, Strzalka Piotr

Metrology and Measurement Systems

2025

Vol. 32, nr 2

1--15

The increasingly common practical application of systems for the dynamic weighing of vehicles in motion makes necessary periodic assessment of correct operation of such systems and calibration of the results obtained from them. This paper presents an experimental study and the obtained measurement results which allow for the determination of reference values essential for the calibration process. It was assumed that Weigh-In-Motion (WIM) systems will be calibrated using the pre-weighed vehicle method. The desired reference values in this case are thus gross weight (Gross Vehicle Weight - GVW) and static load of individual test vehicle axles used in the calibration process. The experiments and analysis of results obtained from them presented in this work involve the use of a platform scale for determination of GVW, as well as portable scales or a dynamic low-speed scale (LS-WIM), intended for measurement of the loads of individual axles of vehicles. All of the scales used in the experiments have valid certificates of metrological approval. The results obtained indicate the possibility of significant simplification of the procedure while still maintaining the required accuracy. The simplification proposed involves the possibility of abandoning the GVW measurement on the platform scale, instead determining this value by summing up the load measurements of all the vehicle’s axles obtained on the LS-WIM scale.

Experimental assessment of the accuracy of High Speed Weigh-In-Motion systems

Sroka Ryszard, Gajda Janusz, Burnos Piotr, Danioł Mateusz, Kania-Markocka Anna, Ślusarski Wiktor, Ziółkowski Robert, Strzałka Piotr

Metrology & Hallmark

2024

Vol. 1

art. no. 2

This paper presents the results of research on the accuracy of two HS-WIM systems located in Wielka Wieś near Tarnów, Poland. Each of the systems is fitted with eight load sensors laid out in four lines, manufactured using different technologies. Quartz and bending plate sensors were used. The study of the accuracy of these systems was conducted using the pre-weighed vehicles method, after two years of operation of the systems, without correction of calibration factors during this period. The results obtained indicate that in both systems there is an systematic error with a value of approximately 2.9 %. These results have made it possible to assess the current error of the HS-WIM systems and to assign to them accuracy classes according to COST 323 guidelines. The calibration which was performed on both systems allowed for the elimination of among others of systematic error and showed the possibilities for reducing random errors in the analysed systems. Studies such as this one may be useful for assessing the periods between successive calibrations of HS-WIM systems in order to maintain accuracy in the assumed class in accordance with COST 323 (e.g. A(5), B+(7), B (10) etc.).

Redefinition of the kilogram standard and consensus value setting

Sej Monika, Hantz Andrzej, Kania-Markocka Anna, Stępień Krzysztof

Mechanik

2024

R. 97, nr 10

39--41

The Mass Laboratory of the Central Office of Measures (GUM) is responsible for transferring the mass unit, conducting research for metrological control, and calibrating mass measurement standards. GUM possesses the national prototype of the mass unit - the kilogram prototype No. 51. The new definition of the SI mass unit - the kilogram - based on the Planck constant, came into effect on May 20, 2019, paving the way for future independent realizations of this unit by National Metrology Institutes (NMI). To ensure global uniformity during the transition from a material standard to the new realization method, the Consultative Committee for Mass and Related Quantities (CCM) introduced the concept of consensus value. The consensus value acts as a bridge, enabling a safe and smooth transition during the redefinition. This article discusses the stages of transferring the mass unit after the redefinition, the process of determining the consensus value, and the impact of these changes on national mass values. It also presents prospects for the future development of techniques to realise and disseminating the kilogram unit according to the new definition.

Laboratorium Masy Głównego Urzędu Miar (GUM) zajmuje się przekazywaniem jednostki miary masy, prowadzeniem badań na potrzeby kontroli metrologicznej oraz wzorcowaniem wzorców pomiarowych masy. GUM posiada państwowy wzorzec jednostki miary masy - prototyp kilograma nr 51. Nowa definicja jednostki masy układu SI - kilograma - oparta na stałej Plancka, weszła w życie 20 maja 2019 r., otwierając drogę do przyszłych niezależnych realizacji tej jednostki przez Krajowe Instytuty Metrologiczne (NMI). Aby zapewnić globalną jednolitość podczas przejścia z materialnego wzorca do nowego sposobu realizacji, Komitet Konsultacyjny ds. Masy i Wielkości Pochodnych (CCM) Międzynarodowego Biura Miar w Sevres (BIPM) wprowadził koncepcję wartości konsensusu. Wartość konsensusu działa jako pomost umożliwiający bezpieczne i bezkolizyjne przeprowadzenie redefinicji. Artykuł omawia etapy przekazywania jednostki masy po redefinicji, proces wyznaczania wartości konsensusu oraz wpływ tych zmian na przekazywanie jednostki miary masy w poszczególnych krajach. Przedstawiono także perspektywy przyszłego rozwoju technik realizacji i rozpowszechniania jednostki kilograma zgodnie z nową definicją.