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    Wyświetlanie 1-7 z 7
    Tytuł:
    Distribution of masses and presses on axles and wheels and vehicles’ properties
    Autorzy:
    Rybak, Piotr
    Wiśniewski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/242007.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    car
    mass
    pressures
    properties
    Opis:
    One of the most important parameters affecting traction properties as well as driving safety, especially with regard to vehicles with special purpose, is the distribution of wheel and axle loads on the ground. This issue should be taken into account during the process of creating new vehicles as well as during the modernization process. In the first case, it is quite simple because the mass distribution is shaped already in the design phase. In the second case, the problem is more complex, because with modernization solutions we enter an already existing structure. Modernization basically assumes improving the performance and capabilities of the vehicle with possibly small changes in its base structure. Thus, it imposes important boundary conditions. The article presents the methodology of measurement and selected results of measurements of mass distribution as well as wheel and axle loads of selected motor vehicles during their advanced modernization (STAR 266 cars to the version STAR 266M2 and Honker 2000 to the version Honker M-AX). Modernizations carried out by Autobox Innovations Ltd. Lim. Par are mainly focused on increasing the traction of vehicles, traffic safety, and driving comfort. Measurements were made at the above-mentioned company.
    Źródło:
    Journal of KONES; 2019, 26, 1; 141-146
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of wheeled armoured personnel carrier firing sideways
    Autorzy:
    Wiśniewski, Andrzej
    Rybak, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/246344.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    wheeled vehicle
    vehicle dynamics
    vehicle stability
    armament
    finite element method
    Opis:
    One of the most important and commonly used means of transport in the armed forces of various countries is wheeled armoured personnel carriers. After proper preparation, beside transport tasks, they can carry out special tasks, as part of regular and irregular activities within purpose of supporting actions of troops. This paper presents preliminary results of numerical research of wheeled armoured personnel carrier with 8x8-drive system. The effect of impact of large calibre cannon (120 mm) with reduced recoil force on transporter behaviour was investigated. The research object model consists of shell, solid and discrete elements. The research was carried out in the LS-DYNA software. Considered variant applies to sideways firing (to the left of the vehicle) for cannon elevation angle 16 deg. Numerical model of standing still on the flat ground wheeled armoured personnel carrier was preloaded with the gravitational force. The results of post-firing vehicle behaviour including angular displacement of the hull, dynamic deflections of the suspensions and impact on the stability of the wheeled vehicle were evaluated.
    Źródło:
    Journal of KONES; 2019, 26, 2; 175-180
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of the upper respiratory tract aerated space volume using the results of computed tomography
    Autorzy:
    Rybak, Adam
    Zając, Andrzej
    Kukwa, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/221767.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CT studies
    upper respiratory tract diagnostics
    quantitative measurement of upper respiratory tract aerated space volume
    Opis:
    The paper presents the possibilities of quantitative analysis of results obtained from CT examination of organs and anatomical structures of the upper respiratory tract. The presented results of the analysis were obtained using proprietary software developed in the MATLAB 2018b environment (Image Processing toolbox). The software enables to visualize the original results of CT scan and, after evaluating the visible structures, enables to select the area to be subjected to quantitative analysis. After the initial identification of an area of interest requiring detailed diagnostics, its volume and the surface areas of individual cross-sections are calculated in the area separated for examinations. A graphical presentation of the analysis results - the surface areas of selected cross-sections possible to visualize in two- and three-dimensional space - enables quick analysis of changes in the examined region.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 387-401
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the impact of wear and tear of rubber elements in tracked mechanism on the dynamic loads of high-speed tracked vehicles
    Autorzy:
    Rybak, Piotr
    Hryciów, Zdzisław
    Michałowski, Bogusław
    Wiśniewski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2204656.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    maintenance
    tracked mechanism
    rubber elements
    road wheel
    high-speed tracked vehicle
    characteristics
    modelling
    Opis:
    The operation of high-speed tracked vehicles takes place in difficult terrain conditions. Hence, to obtain a high operational relia-bility, the design or modernisation process must be precise and should consider even the slightest details. The article presents issues re-lated to the problem of formulating vehicle models using partial models of flexible elements used in tracked mechanisms. Changes occur-ring in the shape and properties of elements such as track pads and roadwheel bandages as a consequence of operating conditions are presented. These changes are reflected in the presented elastic–damping characteristics of components of the crawler mechanism. Nu-merical studies have shown that deterioration of chassis suspension components after a significant mileage may increase dynamic loads (forces) acting on the running gear. Increased forces in the running gear naturally result in increased stresses in the road surface on which the vehicle is travelling, which can pose a danger (or excessive wear and tear) to road infrastructure components such as culverts, bridges and viaducts. In the literature, model tests of objects are carried out on models that represent new vehicles, and the characteristics of the adopted elements correspond to elements not affected by the process and operating conditions. Its influence should not be ignored in the design, testing and running of a special vehicle. The tracked mechanism, as running gear, is designed for special high-speed vehicles for off-road and off-road driving. Its design ensures high off-road traversability. The dynamic loads originating from off-road driving are super-imposed on those generated by the engine, drive train and interaction of the tracks with the roadwheels, sprocket, idler and supporting tracks return rollers.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 1; 85--94
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anatomical and functional assessment of patency of the upper respiratory tract in selected respiratory disorders - Part 2
    Autorzy:
    Zając, Andrzej
    Kukwa, Andrzej
    Barański, Robert
    Nitkiewicz, Szymon
    Zomkowska, Edyta
    Rybak, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/2173877.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical diagnostic in otolaryngology
    upper respiratory tract diagnostics
    otolaryngology
    spirometer
    Fourier transform
    wavelet transform
    quantitative parameters of the respiratory cycle
    Opis:
    This article presents selected physical diagnostic methods used in otorhinolaryngology and results of their application. In addition to the applications of methods using the capabilities of selective sensors, selected methods of hybrid diagnostics were also presented - for assessment of parameters of respiratory processes, with polysomnography as an example of using both typical diagnostic methods dedicated to otolaryngology, as well as standard EEG and ECG methods. It has been shown that in some special cases of respiratory disorders, measurements of the air flow in the respiratory tract can be supplemented with pressure measurements in selected positions within the airways. The presented optical methods and diagnostic systems are very often used in the diagnosis of diseases not specific for otolaryngology occurring in the area of the head and neck. The presented material is the second part of the study discussing both standard and widely used diagnostic methods. All presented methods are dedicated to otolaryngology. This text is a continuation of the material published in No 4 of 2021 [1].
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 3; 429--454
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anatomical and functional assessment of patency of the upper respiratory tract in selected respiratory disorders - Part 1
    Autorzy:
    Kukwa, Andrzej
    Zając, Andrzej
    Barański, Robert
    Nitkiewicz, Szymon
    Kukwa, Wojciech
    Zomkowska, Edyta
    Rybak, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/2052154.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical diagnostic in otolaryngology
    upper respiratory tract diagnostics
    otolaryngology
    spirometer
    Fourier transform
    wavelet transform
    quantitative parameters of the respiratory cycle
    Opis:
    The rapidly developing measurement techniques and emerging new physical methods are frequently used in otolaryngological diagnostics. A wide range of applied diagnostic methods constituted the basis for the review study aimed at presenting selected modern diagnostic methods and achieved diagnostic results to a wider group of users. In this part, the methods based on measuring the respiratory parameters of patients were analysed. Respiration is the most important and necessary action to support life and its effective duration. It is an actual gas exchange in the respiratory system consisting of removing CO2 and supplying O2. Gas exchange occurs in the alveoli, and an efficient respiratory tract allows for effective ventilation. The disruption in the work of the respiratory system leads to measurable disturbances in blood saturation and, consequently, hypoxia. Frequent, even short-term, recurrent hypoxia in any part of the body leads to multiple complications. This process is largely related to its duration and the processes that accompany it. The causes of hypoxia resulting from impaired patency of the respiratory tract and/or the absence of neuronal respiratory drive can be divided into the following groups depending on the cause: peripheral, central and/or of mixed origin. Causes of the peripheral form of these disorders are largely due to the impaired patency of the upper and/or lower respiratory tract. Therefore, early diagnosis and location of these disorders can be considered reversible and not a cause of complications. Slow, gradually increasing obstruction of the upper respiratory tract (URT) is not noticeable and becomes a slow killer. Hypoxic individuals in a large percentage of cases have a shorter life expectancy and, above all, deal with the consequences of hypoxia much sooner.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 4; 813-836
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluid pathways within shallow-generated damage zones of strike-slip faults – evidence of map-scale faulting in a continental environment, SW Permo-Mesozoic cover of the Late Palaeozoic Holy Cross Mountains Fold Belt, Poland
    Autorzy:
    Rybak-Ostrowska, Barbara
    Konon, Andrzej
    Hurai, Vratislav
    Bojanowski, Maciej
    Konon, Agnieszka
    Wyglądała, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/139101.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    strike-slip faulting
    fluid pathways
    continental environments
    Chmielnik releasing stepover
    Permo-Mesozoic cover
    Holy Cross Mountains Fold Belt
    uskok przesuwczy
    środowisko lądowe
    pokrywa
    perm
    mezozoik
    Góry Świętokrzyskie
    Opis:
    The damage zones of exhumed strike-slip faults dissecting Jurassic carbonates in the south-western part of the Late Palaeozoic Holy Cross Mountains Fold Belt reveal second-order faults and fractures infilled with syntectonic calcite. The subsequent development of a structural pattern of microscopic fault-related structures and calcite infillings reflects the activity of strike-slip faults that began in the Late Cretaceous (Late Maastrichtian) and lasted until the early Miocene (Langhian). The fabric of the syntectonic veins provides insights into the evolution of the permeable fault-related structures that were the main pathways for fluid flow during fault activity. Microstructural study of calcite veins coupled with stable isotope and fluid inclusion data indicates that calcite precipitated primarily in a rock-buffered system related to strike-slip fault movement, and secondarily in a partly open system related to the local activity of the releasing Chmielnik stepover or the uplift of the area. The presence of meteoric fluids descending from the surface into damage zones suggest that the strike-slip faulting might have taken place in a nonmarine, continental environment.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 1; 1-29
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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