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    Wyświetlanie 1-4 z 4
    Tytuł:
    The magnetic field curvature correction algorithm dedicated for helmet mounted cueing systems
    Autorzy:
    Adamski, M.
    Szelmanowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/949523.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    avionics
    helmet-mounted cueing systems
    errors of the angular positioning
    magnetic field measurement
    flat coil profile modelling
    Opis:
    The article presents the new built in Poland helmet mounted cueing system NSC-1 Orion with a magnetic method, dedicated to the multi-purpose helicopters W-3PL Gluszec. This system uses the magnetic field generated by the system of three mutually orthogonal electric coils. The principle of operation of this system is described and the method of determining the angular position of the pilot's helmet relative to the helicopter's cabin using the reference magnetic field and the directional cosines matrix are discussed. Electrical flat coils, constructed in the Polish Air Force Institute of Technology (AFIT), generating a magnetic field with curved symmetry axis characteristics, causing errors in determining the angular position of the pilot's helmet are shown. As a way to minimize these errors, an original proprietary algorithm for correcting the negative impact of the magnetic field curvature generated by the on-board system has been presented. Mathematical relations describing the presented correction process as well as selected results of simulation and experimental investigations in the area of inaccuracy of the "before" and "after" systems of applying the developed algorithm were given. Inaccuracies determined from computer simulations of the developed mathematical relations were compared with experimental data from magnetic field measurements using the integrated three-axis sensor ADIS-16405, used in the laboratory of the AFIT Avionics Division for helmet control of the angular position of the moving observation and sighting head and reflector-search light.
    Źródło:
    Journal of KONES; 2018, 25, 2; 15-30
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic field of a radial tire after puncture caused by ferromagnetic elements
    Autorzy:
    Szegda, A.
    Radkowski, S.
    Brol, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/298281.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    magnetic profile
    tire
    ferromagnetic penetrator
    Opis:
    Tire, an element of wheel, is made in a sophisticated vulcanization process of many components and some of which such as: bead wire, belt and carcass exhibit ferromagnetic properties. Such components create variable in direction and intensity magnetic field, which expands around tire and the complete wheel. Since the layout of magnetic field is exceptional for every single wheel many of information might be obtained on the basis of it alteration. The reported since now application concentrates on rotational speed measurement, wheel rotations counting and therefore also vehicle linear speed and distance estimation. However up to the present the known solutions did not describe changes in magnetic field in case of damage induced by e.g. puncture caused by ferromagnetic elements. This paper’s aim is to test the thesis that it is possible to detect puncture in tire made by ferromagnetic element by using measurement and analysis of changes of magnetic flux density around tire. The tests were executed using original measuring device, designed especially for such experiments. It registers a magnetic profile, which consists of data series of magnetic flux density measured in this investigations 55 mm above tire’s tread and arranged along with rotation angle. Tire magnetic properties were assessed by using of circumferential magnetic profiles and parameters such as: minimum value (Mmin), maximum value (Mmax), peak to peak value (Mm), average value of ordinates of profile (Mb), skewness of ordinate distribution (Ms) and kurtosis of ordinate distribution (Mk). Magnetic profiles before after puncture were analysed as well as the parameters. Moreover differential signal caused by puncture were determined. It turned out that detected changes are directly related to tire damage and showing in rotation angle where puncture occurs.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(3); 183-194
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detekcja osi pojazdów z użyciem petli indukcyjnej
    Inductive loop sensors for vehicle axle detection
    Autorzy:
    Marszałek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/267250.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    czujnik indukcyjny pętlowy
    detekcja osi pojazdów
    magnetyczny profil rezystancji
    magnetyczny profil reaktancji
    inductive loop sensor
    axle detection
    magnetic profile of resistance
    magnetic profile of reactance
    Opis:
    Aktualnie stosowane rozwiązania, umożliwiające detekcje osi pojazdów samochodowych, bazują na mechanicznych czujnikach nacisku, po których przeje d a pojazd. Powszechnie stosowane są czujniki piezoelektryczne, lub o wiele droższe, kwarcowe, umożliwiające poza detekcja osi, ważenie pojazdów w ruchu (WIM). Tam, gdzie nie jest wymagana informacja o masie pojazdu, a wymagana jest klasyfikacja pojazdów ze względu na liczbę osi, drogie systemy WIM nie są konieczne. Nie zawsze sprawdzają sie w stu procentach, ponieważ samochody cie arowe mogą podnosić przynajmniej jedna os. Systemy bazujące na pętli indukcyjnej, dzięki innej zasadzie działania, pozwalają na detekcje równie podniesionych osi, przez co możliwa jest poprawna klasyfikacja pojazdów cie arowych. Pętle indukcyjne charakteryzują sie bardzo duża trwałością oraz prosta budowa. Czas ich eksploatacji wielokrotnie przekracza czas eksploatacji stosowanych detektorów. Pętle indukcyjne do detekcji osi pojazdów wymagają stosowania bardzo czułych układów kondycjonowania.
    Currently used solutions for the axle vehicle detection sensors are based on measurements of mechanical stress or pressure generated in the tube or a special mat installed in the road surface on which the vehicle travels. Piezoelectric, or quartz sensors are commonly used in WIM systems (weight in motion) and allow detection and weighting vehicles in motion. If no information is required regarding the values axle (or estimate the weight of the vehicle), and only the classification of vehicles based on the number of axles is required, WIM systems are not popular because of its cost. Furthermore, WIM systems would lose its efficiency if the trucks could pick up and leave at least one axle. Systems based on an inductive loop sensor, with a different mode of operation may also allow the detection of elevated axles, whereby it is possible to correctly classify vehicles. Moreover, inductive loop sensors have very high durability, simple construction and its lifetime many times exceeds the lifetime of the classical axle detectors. However, inductive loops sensors require the design of complex electronic systems and even the use of computer systems equipped with so-called advanced signal analysis of magnetic profiles. This paper presents the design and operation of inductive loop sensors. A new approach is proposed for the detection of vehicle axles. It is based on the new conditioning systems that provides magnetic profile of resistance (R~) and magnetic profile of reactance (X~) of the inductive loop sensor. Figure 2 shows the measurement system in which the profiles of R~ and X~ for a passenger vehicle are obtained in a static conditions (zero vehicle speed during the measurement). The details of main parameters of considered inductive loops are shown in Table 1 and in Figure 1. Thanks to the profiles of R~ and X~ and formulas (2) and (3) the sensitivity of sensors, SR and SX respectively were determined and these are shown in Table 1. Figures 3 and 4 show profiles respectively R~ and X~ obtained from the inductive loop sensors 1, 2, 3, 4. The Figure 5 shows the profiles R~ and X~ with a narrow sensor No. 4 (according to the Table 1) while the signal W1 shown in Figure 6 shows the result of the weighted sum W1=a R~ + X~. Digital signal W3 is obtained by comparing the signals W1 and W2 in the comparator and it provides information regarding the presence of the vehicle axle that can be easily counted by the digital device. Finally profiles R~ and X~ recorded in real traffic by means of a narrow sensor No. 4 (vehicles shown in the pictures a-f in Table 2 were considered) are shown in Figures 7-12.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2013, 34; 43-47
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new method of inductive sensors impedance measurement applied to the identification of vehicle parameters
    Autorzy:
    Marszałek, Z.
    Sroka, R.
    Stencel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221039.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inductive loop sensor
    substitute parameters
    magnetic profile
    measurement of traffic parameters
    Opis:
    Inductive loop sensors are widely used for detection of presence, measurement of parameters as well as classification of vehicles. Vehicle classification may be performed based on their magnetic profiles. The magnetic profile is a signal which is proportional to the resultant of an impedance change of the sensor, caused by the measured object (the changes are minor - of the order of 1%). Generator and bridge circuits are most commonly used as conditioning circuits for such sensors. As a result we can obtain one output signal proportional to total changes of sensor parameters (R and L). In this paper, a modified bridge circuit that allows independent measurement of the components (R and L) of the sensor's impedance, has been proposed. With that provided, it is possible to receive broader information on the object, which allows higher classification resolution. This paper provides the concept of a circuit, model testing results, processing algorithms used and the test results of a real circuit.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 1; 69-76
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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