Autor: Bernyś, K. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Preliminary numerical analysis of selected phenomena occurring in a rail fastening system
Autorzy:: Szurgott, P.
Bernyś, K.
Powiązania:: https://bibliotekanauki.pl/articles/242992.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: rail pad
fastening system
moving load
numerical analysis
hyperelastic material
Opis:: The results of numerical analysis of selected phenomena occurring in a rail fastening system were presented in the paper. The study is focused on assessment of the state of displacement and stresses in the rail pad subjected to a moving load. Two finite element models of the considered system were developed. The first one included elementary track segment corresponding to one sleeper. The second FE model consisted of several elementary segments. The number of the track segments was determined independently on the basis of dynamic analysis carried out using LS-DYNA computer code. Essential FE analyses were performed using MSC.Marc/Mentat software. FE model of the elementary segment included 600 mm length rail and a two-side shaped rail pad. The Mooney - Rivlin material model was applied for the polyurethane rail pad. The fastening systems were modelled using spring elements. The vertical and longitudinal spring elements were also applied for the ballast modelling. A case of moving load caused by single vertical force - one axle - was considered in the study. Methodology of moving load simulation in the MSC.Marc software was proposed. The obtained results allowed assessing the total deflection of the rail pad, the state of stress, the load distribution on respective sleepers. Moreover, they gave information about the behaviour of the rail pad under moving load in context of static test described in respective standards.
Źródło:: Journal of KONES; 2012, 19, 4; 607-614
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical analysis of load distribution in railway track under wheelset
Autorzy:: Szurgott, P.
Bernyś, K.
Powiązania:: https://bibliotekanauki.pl/articles/244219.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: railway rack
wheelset
bogie
moving load
numerical analysis
Opis:: The results of numerical analysis of a load distribution in a railway track under wheelset are presented in the paper. Dynamic analysis was carried out using LS-DYNA computer code. Ballasted track with the rectilinear rail-line axis was taken into consideration. Finite element model of the track section was developed. The model included two rails, fastening systems, sleepers, ballast and the embankment. Fasteners and the ballast layer were modelled using 1-D massless discrete elements – springs and dampers. Sleepers were modelled as elastic beams. The embankment was reflected approximately by a rectangular prism with unmovable side and bottom boundary surfaces. Moving load was applied using simplified FE models of railway vehicles. Vertical forces were put in the wheel – rail contact points. Two types of the vehicles, and loads consequently, were considered – the first one including two single wheelsets whereas the second one was equipped with two classic 2-axle bogies. RAIL_TRACK and RAIL_TRAIN LS-DYNA’s modules were applied for simulating the vehicle – track interaction. Displacements of selected nodes as well as other characteristic values were registered during the numerical simulation. Contours of stress and displacements for selected moment of time were also presented as a result of the FE analysis. The study gave information about the behaviour of the railway track and foundation under load caused by single axle and 2-axle bogie. Obtained results were compared to those available in the literature and the technical instructions of railway design.
Źródło:: Journal of KONES; 2013, 20, 3; 405-410
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Filtering of two-dimensional digital images using weighted averaging for adaptive selection of weights
Autorzy:: Momot, A.
Wrobel, J.
Horoba, K.
Jeżewski, M.
Bernys, M.
Powiązania:: https://bibliotekanauki.pl/articles/951702.pdf
Data publikacji:: 2012
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: filtracja obrazów
ważone uśrednianie
image filtering
weighted averaging
adaptive selection of weights
Opis:: Many digital images, especially in biomedical fields, contain some disturbances. The image analysis depends on quality of the images that is why reduction or elimination (if it is possible) the disturbances is the key issue. There are many methods of improvement in the quality of the images and thus improve the quality of the image analysis, among them one of the simplest method is low-pass filtering such as arithmetic mean or its generalization, weighted mean. The basic problem of the weighted mean is the proper selection of the weights. This can be done using adaptive algorithms. This paper presents several such algorithms which are modifications of the existing weighted averaging methods created originally for noise reduction in electrocardiographic signal. The description of the new filtering methods and a few results of its application are also presented with comparison to existing arithmetic average filtering.
Źródło:: Journal of Medical Informatics & Technologies; 2012, 20; 93-99
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Simultaneous recording and analysis of direct and indirect fetal electrocardiography
Autorzy:: Matonia, A.
Jeżewski, J.
Kupka, T.
Horoba, K.
Bernys, M.
Powiązania:: https://bibliotekanauki.pl/articles/333338.pdf
Data publikacji:: 2004
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: EKG płodu
monitorowanie płodu
fetal electrocardiography
fetal monitoring
Opis:: Recording and analysis of fetal heart rate variability is still the most common method for detection of early symptoms of fetal hypoxia. However, fetal heart rate obtained via ultrasound describes only mechanical activity of fetus heart. Limitations of this technique have stimulated the development of fetal electrocardiography. It ensures more precise determination of fetal heart rate and, which is more important, enables assessment of the morphology of the fetal QRS complexes. In this paper two techniques of obtaining the fetal electrocardiogram are described and their comparative study is presented.
Źródło:: Journal of Medical Informatics & Technologies; 2004, 8; MM111-118
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A routing protocol for wireless network of bedside monitors in fetal surveillance system
Autorzy:: Seredynski, R.
Horoba, K.
Roj, D.
Bernys, M.
Przybyla, T.
Jezewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/333626.pdf
Data publikacji:: 2012
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: monitorowanie płodu
tętno płodu
sieci bezprzewodowe
protokoły rutowania
symulacja
fetal monitoring
fetal heart rate
wireless networks
routing protocol
simulation
Opis:: The paper presents the methodology of wireless network design, developed according to the requirements originating from existing wired fetal surveillance systems. The proposed network structure is based on popular radio frequency modules, operating in 433/866MHz band. The described solution is a simple and cost effective alternative to the wired networks, and it will vastly increase the mobility of fetal monitors. The authors also describe software tools which were designed for this purpose and the results of simulations performed on their basis.
Źródło:: Journal of Medical Informatics & Technologies; 2012, 21; 27-33
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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