Wyniki wyszukiwania - BazTech

1

Tire punctures with an aluminium penetrator

Brol Sebastian, Szegda A.

Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska

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2019

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z. 2/120

19--24

EN

The article titled "Tyre puncture with an aluminium penetrator" presents the methodology of the measurements related to tire puncture. The creation of a differential profile and differential profiles matrix is discussed. The matrix is analysed based on 3D spatial charts and maps. It has been shown that there is an anomaly in the puncture site. It was discussed in the circumferential direction and the depth of insertion of the penetrator. Conclusions and remarks regarding the practical application of observations are presented.

PL

W artykule pt. "Przebicie opony penetratorem ze stopu glinu" przedstawiono metodykę pomiaru. Omówiono tworzenie profilu różnicowego i macierzy profili różnicowych. Dokonano analizy macierzy na podstawie przestrzennych wykresów 3D i wykresów mapowych. Wykazano, że w miejscu przebicia występuje anomalia. Opisano ją w kierunku obwodowym i głębokości wsunięcia penetratora. Przedstawiono wnioski i uwagi dotyczące praktycznego zastosowania poczynionych spostrzeżeń.

2

Magnetic field of a radial tire after puncture caused by ferromagnetic elements

Szegda A., Radkowski S., Brol S.

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2018

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nr 21(3)

183--194

EN

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.

3

A new method of inductive sensors impedance measurement applied to the identification of vehicle parameters

Marszałek Z., Sroka R., Stencel M.

Metrology and Measurement Systems

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2011

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Vol. 18, nr 1

69-76

EN

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.