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Wyświetlanie 1-15 z 455
Tytuł:
An investigation on using the falling mass technique for dynamic force calibrations
Autorzy:
Gelany, Shaker A.
Mahmoud, Gouda M.
Powiązania:
https://bibliotekanauki.pl/articles/1849008.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
calibration
dynamic calibration
impact force
falling weight
Opis:
In this paper, we present an experimental setup developed for the calibration of dynamic force transducers which is based on the drop mass method. The traceability to SI units is realized through well-known mass characteristics and a reference shock accelerometer attached to that mass. Two approaches are proposed to analyse dynamic force employing a drop mass system. One approach depends on the inertial force of a falling mass while the other deals with the work-energy principle. Results of both approaches are then compared to the response of a statically calibrated force transducer. It is shown that the obtained maximum relative deviations between the response of force transducer and the first approach results are 1% while those of the second approach are 2%.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 455-463
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consistent Estimation of Cross-Classified Domains
Autorzy:
Lumiste, Kaur
Powiązania:
https://bibliotekanauki.pl/articles/466094.pdf
Data publikacji:
2011
Wydawca:
Główny Urząd Statystyczny
Tematy:
Consistent estimation
calibration
AC-calibration
repeated weighting
Opis:
Domain estimation has become an important area in survey sampling, however a lot of problems associate with it. One out of many is the lack of consistency between different surveys. The results of one survey do not coincide with the results of another survey done earlier or simultaneously, although the same variable is under study. We study two methods, AC-calibration (A – auxiliary, C – common) and repeated weighting (RW), for achieving consistency. A short overview of these two methods is given, and we develop formulas for a specified case, for the crossclassified domains. We assume that there are two sources of information on the study variables (either surveys or registers). The problem is that one source has information on domains formed by certain categorical variable, not considered or not identified in the other source. Instead, this second source has information on domains formed by another categorical variable. We are however interested in domains cross-classified with these categorical variables. A survey is done regarding these new domains, but the domain estimates will probably be inconsistent with marginal information, from earlier surveys. We require that the new domain estimates be consistent with the marginals. To achieve this we apply AC-calibration or repeated weighting. The formulas of AC-calibration and RW for the cross-classified domains are tested in a simulation study. Simulations were done on a population composed of real data from the Estonian Household Survey.
Źródło:
Statistics in Transition new series; 2011, 12, 2; 253-264
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation on using the falling mass technique for dynamic force calibrations
Autorzy:
Gelany, Shaker A.
Mahmoud, Gouda M.
Powiązania:
https://bibliotekanauki.pl/articles/1849097.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
calibration
dynamic calibration
impact force
falling weight
Opis:
In this paper, we present an experimental setup developed for the calibration of dynamic force transducers which is based on the drop mass method. The traceability to SI units is realized through well-known mass characteristics and a reference shock accelerometer attached to that mass. Two approaches are proposed to analyse dynamic force employing a drop mass system. One approach depends on the inertial force of a falling mass while the other deals with the work-energy principle. Results of both approaches are then compared to the response of a statically calibrated force transducer. It is shown that the obtained maximum relative deviations between the response of force transducer and the first approach results are 1% while those of the second approach are 2%.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 455-463
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation on using the falling mass technique for dynamic force calibrations
Autorzy:
Gelany, Shaker A.
Mahmoud, Gouda M.
Powiązania:
https://bibliotekanauki.pl/articles/1849140.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
calibration
dynamic calibration
impact force
falling weight
Opis:
In this paper, we present an experimental setup developed for the calibration of dynamic force transducers which is based on the drop mass method. The traceability to SI units is realized through well-known mass characteristics and a reference shock accelerometer attached to that mass. Two approaches are proposed to analyse dynamic force employing a drop mass system. One approach depends on the inertial force of a falling mass while the other deals with the work-energy principle. Results of both approaches are then compared to the response of a statically calibrated force transducer. It is shown that the obtained maximum relative deviations between the response of force transducer and the first approach results are 1% while those of the second approach are 2%.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 455-463
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Autokalibracja torów pomiarowych poprzez interpolację funkcji przetwarzania za pomocą liniowych funkcji sklejanych
Self-calibration of measurement channels by means of linear spline interpolation of conversion function
Autorzy:
Gawędzki, W.
Powiązania:
https://bibliotekanauki.pl/articles/156420.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
kalibracja
autokalibracja
czujniki
interpolacja
calibration
self-calibration
sensors
interpolation
Opis:
W artykule zaproponowano pewną metodę kalibracji toru pomiarowego wielkości nieelektrycznych poprzez wyznaczanie czułości łącznej. Pokazano sposoby implementacji algorytmów autokalibracji dla różnych rodzajów torów pomiarowych w zależności od typu funkcji przetwarzania czujnika wielkości nieelektrycznych. Rozpatrzono często stosowane czujniki z wyjściem stosunkowym (czujniki zintegrowane, układy mostkowe), w których wielkość mierzona jest przetwarzana na stosunek napięcia wyjściowego czujnika do jego napięcia zasilania. Uwzględniono przy tym przypadki liniowej i nieliniowej funkcji przetwarzania toru pomiarowego. Przyjęto interpolację funkcji przetwarzania za pomocą liniowych funkcji sklejanych. Pokazano przykład implementacji algorytmu autokalibracji.
In the paper certain method is proposed, concerning calibration of a channel for measurements of non-electrical quantities, by means of total sensitivity evaluation. The implementation ways of self-calibration algorithms are shown, for different types of measurement channels, depending on the type of conversion function of non-electrical quantity sensor. Frequently used sensors with ratio output have been examined (integrated sensors, bridge circuits), in which a measurand is converted to a ratio of sensor output voltage to its supply voltage. The cases of linear and non-linear conversion function of a measurement channel have been taken into consideration. The interpolation of conversion function has been realized with linear spline functions. An example of implementation of self-calibration algorithm is shown.
Źródło:
Pomiary Automatyka Kontrola; 2008, R. 54, nr 1, 1; 3-7
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing laser step diagonal measurement by multiple sensors for fast machine tool calibration
Autorzy:
Dahlem, P.
Montavon, B.
Peterek, M.
Schmitt, R. H.
Powiązania:
https://bibliotekanauki.pl/articles/99640.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool calibration
step diagonal measurement
integrated calibration system
Opis:
The volumetric performance of machine tools is limited by the remaining relative deviation between desired and real tool tip position. Being able to predict this deviation at any given functional point enables methods for compensation or counteraction and hence reduce errors in manufacturing and uncertainties for on-machine measurement tasks. Time-efficient identification and quanitification of different contributions to the resulting deviation play a key role in this strategy. The authors pursue the development of an optical sensor system for step diagonal measurement methods, which can be integrated into the working volume of the machine due to its compact size, enabling fast measurements of the axes’ motion error including roll, pitch and yaw and squareness errors without significantly interrupting the manufacturing process. The use of a frequency-modulating interferometer and photosensitive arrays in combination with a Gaussian laser beam allow for measurements at comparable accuracy, lower cost and smaller dimensions compared to state-of-the-art optical measuring appliances for offline machine tool calibration. For validation of the method a virtual machine setup and raytracing simulation is used which enables the investigation of systematic errors like sensor hardware misalignment.
Źródło:
Journal of Machine Engineering; 2018, 18, 2; 64-73
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The national radioactivity monitoring network of the Netherlands
Autorzy:
Deurwaarder, Ch.
Hoogeboom, K.
Van Tuinen, S.
Powiązania:
https://bibliotekanauki.pl/articles/148049.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
calibration
monitoring systems
Opis:
Since the first activities concerning the monitoring networks of the Netherlands in 1986 a lot of optimalisation and adaptation steps have been made. A good maintenance regime, both for computer systems, software and for measuring stations is the key solution to trust in the early warning function of the network. Starting in 1986 the Nuclear Research and Consultancy Group (NRG) has built up a large expertise in the construction and maintenance of such early warning systems. This is also the benefit of having calibration facilities available on the company area of NRG for the different types of detection systems: calibrations can be performed for systems for gamma radiation, aerosols, iodine and the noble gases. Finally, with the Incident application, NRG can provide for the organisations involved in emergency planning and response a robust, user-friendly PC-application. With this application not only data can be extracted from a local computer system, at this moment tests are done with getting data from an external FTP-server.
Źródło:
Nukleonika; 2001, 46, 4; 131-135
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensor Calibration Design Based on D-Optimality Criterion
Autorzy:
Hajiyev, C.
Powiązania:
https://bibliotekanauki.pl/articles/220607.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sensor
calibration curve
calibration design
D-optimality criterion
least squares method
Opis:
In this study, a procedure for optimal selection of measurement points using the D-optimality criterion to find the best calibration curves of measurement sensors is proposed. The coefficients of calibration curve are evaluated by applying the classical Least Squares Method (LSM). As an example, the problem of optimal selection for standard pressure setters when calibrating a differential pressure sensor is solved. The values obtained from the D-optimum measurement points for calibration of the differential pressure sensor are compared with those from actual experiments. Comparison of the calibration errors corresponding to the D-optimal, A-optimal and Equidistant calibration curves is done.
Źródło:
Metrology and Measurement Systems; 2016, 23, 3; 413-424
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiaxial transducers calibration
Autorzy:
Pieniążek, J.
Grądek, P.
Powiązania:
https://bibliotekanauki.pl/articles/243927.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
accelerometer
calibration
auto-calibration
nonlinear regression
akcelerometr
kalibrowanie
autokalibracja
regresja nieliniowa
Opis:
The aim of present article is investigating properties of accelerometer calibration method, called automatic calibration. The research of transducer's model was conducted and chosen optimization algorithms were rated by the simulation method and also using real transducer. The aim of tests was examination of the possibility to find parameters of the transducer model considering influence of temperature and deviation of axes. Described optimal calibration process without special calibration apparatus considers also influence of temperature on acceleration measurement. Afterward, described calibration method was tested on real transducer. Obtained results show that the hybrid two-step algorithm is suitable to the multiaxial transducers calibration. In the research, accelerometer as triaxial transducer was chosen and subjected to tests and the results of simulation was recorded in the MATLAB workspace. From existing estimation, three algorithms were chosen: the quasi-Newton, simplex (Nelder-Mead), and Levenberg-Marquard. The experimental part of the calibration utilized the idea of using existing and known constant vector of the measured value like gravitational acceleration and magnetic field. Calibration with temperature compensation of real transducer was presented.
Źródło:
Journal of KONES; 2017, 24, 1; 299-308
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Space orientation based on image from a mobile camera
Autorzy:
Furtak, J.
Powiązania:
https://bibliotekanauki.pl/articles/273331.pdf
Data publikacji:
2001
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
space orientation
camera calibration
Opis:
This paper presents the pose parameters estimation algorithm for a mobile camera in each of its position. The algorithm is based on recursive filtration of intermediary results. This feature makes a knowledge accumulation during calibration process possible. The algorithm was verified experimentally. The way of an experiment execution method and received results are described.
Źródło:
Biuletyn Instytutu Automatyki i Robotyki; 2001, R. 7, nr 15, 15; 3-14
1427-3578
Pojawia się w:
Biuletyn Instytutu Automatyki i Robotyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inertial Navigation Static Calibration
Autorzy:
Niespodziany, S.
Powiązania:
https://bibliotekanauki.pl/articles/226120.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inertial
navigation
imu
calibration
Opis:
Inertial navigation is a device, which estimates its position, based on sensing external conditions (such as acceleration or angular velocity). It is widely used in various applications. Its presence in a drone vehicle for example, allows flight stabilization, by position estimation and feedback-based regulation algorithm execution. A smartphone makes a use of inertial navigation by detecting movement and flipping screen orientation. It is a ubiquitous part of many devices of everyday use, but before using filters and algorithms allowing to calculate the position, a calibration must first be applied to the device. This paper focuses on a separate calibration of each of the sensors - an accelerometer, gyroscope and magnetometer. The further step requires a cross-sensor calibration, and the third step is implementation of data filtration algotithm.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 2; 243-248
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Axis location and scale factors estimation for three-axis machines from periodic performance checks with laser distance measurements - risks and opportunities
Autorzy:
Nafi, A.
Łoś, A.
Mayer, J.R.R.
Powiązania:
https://bibliotekanauki.pl/articles/99577.pdf
Data publikacji:
2010
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
CMM
calibration
performance
diagnostic
Opis:
Users of coordinate measuring machine and large gantry machines need to ensure the volumetric performance of their machines in order to inspect, or machine, mechanical parts with precision. In the case of CMMs, the ASME B89.4.10360.2-2008 document imposes seven directions for a volumetric check. These directions offer some redundancy for axis location (out-of-squarenesses) and scale factor estimation. The paper looks at the opportunity of using the data for immediate machine correction and the risks involved. In particular, the fact of using test data for calibration and verification, the potential contamination from non-modelled motion errors and the representativity of the estimated parameters are considered. Experimental results obtained using laser interferometry on a LEGEX CMMs are used to present the main concepts.
Źródło:
Journal of Machine Engineering; 2010, 10, 4; 89-99
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical modelling of geotechnical structures in ports and offshore
Autorzy:
Bałachowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/259902.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
centrifuge
calibration chamber
CPT
Opis:
The physical modelling of subsoil behaviour and soil-structure interaction is essential for the proper design of offshore structures and port infrastructure. A brief introduction to such modelling of geoengineering problems is presented and some methods and experimental devices are described. The relationships between modelling scales are given. Some examples of penetration testing results in centrifuge and calibration chamber are presented. Prospects for physical modelling in geotechnics are also described.
Źródło:
Polish Maritime Research; 2017, S 1; 4-9
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration of spring gravimeter ET-26 using absolute gravity measurements
Autorzy:
Bogusz, J.
Klek, M.
Powiązania:
https://bibliotekanauki.pl/articles/225131.pdf
Data publikacji:
2008
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
kalibracja
grawimetria
calibration
gravimetric
Źródło:
Reports on Geodesy; 2008, z. 1/84; 111-117
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza dokładności kalibracji obrazu cyfrowego na przykładzie mapy wyrobisk górniczych
The analysis of the accuracy of digital image calibration on the example of a map of mining excavations
Autorzy:
Mierzejewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/165369.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
kalibracja map
błąd kalibracji
metody transformacji
map calibration
calibration error
transformation methods
Opis:
Jednym z etapów związanych z wdrażaniem map górniczych w formie numerycznej w przedsiębiorstwach zajmujących się działalnością górniczą jest kalibracja. Jest to proces polegający na nadaniu przestrzennej orientacji obrazom rastrowym z jednoczesnym usunięciem pewnych zniekszałceń. Z etapem tym wiąże się również pewien poziom dokładności określany metodą średniego błędu tranformacji. Na jego wielkość mają wpływ różne czynniki, w tym m.in. przyjęta metoda transformacji, liczba punktów dostosowania oraz ich rozmiesczenie w obrębie arkusza mapy. Biorąc to pod uwagę autorka przeanalizowała kilka wariantów kalibracji mapy wyrobisk górniczych pod względem dokładności w zależności od liczb oraz rozmieszczenia punktów. Proces kalibracji przeprowadzono w programach Geolisp oraz C-GEO, metodą Helmerta.
Calibration is one of the stages related to the implementation of mining maps in the numerical form of mining companies. It is a process of giving spatial orientation to raster images with simaultaneous removal of some distortions. This stage also involves a certain level of accuracy expressed by means of the average error of transformation. Its size is influenced by various factors, including adopted transformation method, number of adjustment points and their placement within the map sheet. Taking this into consideration, the author analyzed several variants of calibration of the mining excavation map in terms of accuracy depending on the number and distribution of points. The calibration process was carried out in the Geolisp and C-GEO programs by use of the Helmert method.
Źródło:
Przegląd Górniczy; 2018, 74, 8; 59-63
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 455

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