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    Wyświetlanie 1-9 z 9
    Tytuł:
    Control system for slow running bearings. Scientific Journal of Silesian University of Technology
    Autorzy:
    Oeljeklaus, M.
    Pešík, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/196631.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    bearing diagnostic
    vibrodiagnostics
    paint shop
    slow running bearing
    diagnostyka łożyska
    wibrodiagnostyka
    lakiernia
    Opis:
    The subject of this paper is the design of a control system for slow running bearings including a strength analysis and load capacity measurement. The intention here is to apply the results to the manufacturing operation of chain conveyors in paint shops.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 100; 157-164
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of dynamics of a metro vehicle model with differential wheelsets
    Autorzy:
    Melnik, R.
    Sowiński, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/374579.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    rail vehicle
    differential gear
    running gear
    dynamics
    wear
    simulation
    pojazd szynowy
    mechanizm różnicowy
    podwozie
    dynamika
    zużycie
    symulacja
    Opis:
    The operating conditions of light rail vehicles (trams, metro vehicles) are predominantly different compared with those of passenger or freight trains. The increased number of low-radii curves has a negative effect on wheel–rail interaction. The general design of light rail vehicle running gear is inherited from passenger trains and adapted to different loads. However, conventional solutions of a running gear may not provide smooth low-radius curve negotiation in all circumstances. In addition, a two-point contact is likely to occur, which, in turn, leads to accelerated wear of not only the wheels’ tread but also their flanges. One of the proposals to deal with problems associated with the wheel–rail interaction in tight curves is implementing an automotive solution: a differential gear. The aim of the study is to investigate the dynamic behavior of a metro vehicle model equipped with differentials at each wheelset. The differentials were tested in two main variants: open and with internal friction torque. Internal friction torque value was set, consecutively, up to 2000 Nm. The results have shown that on tight curves a differential may improve rail vehicle wheel–rail interaction.
    Źródło:
    Transport Problems; 2017, 12, 3; 93-102
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of improving a rail vehicle running safety with independently rotating wheels
    Autorzy:
    Mikhailov, Evgeny
    Semenov, Stanislav
    Shvornikova, Hanna
    Dižo, Ján
    Blatnický, Miroslav
    Droździel, Paweł
    Kravchenko, Kateryna
    Powiązania:
    https://bibliotekanauki.pl/articles/2176117.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    rail vehicle
    running safety
    independently rotating wheels
    mathematical calculation
    pojazd szynowy
    bezpieczeństwo jazdy
    niezależnie obracające się koła
    obliczeniA matematyczne
    Opis:
    This work is focused on the possible ways of improving the running safety of a railway vehicle, which uses IRWs (independently rotating wheels) in a bogie. It discusses the main positive and negative properties of an application of IRWs for a railway vehicle while it is running in a curve. There are evaluated running properties of a railway vehicle in terms of safety for IRWs and a standard wheelset (SW). It is assumed that a wheelset design with IRWs will reduce the risk of derailment of a railway vehicle in a curve with a smaller radius because it will be reached a more favourable distribution of decisive forces in the wheel/rail contact. A designed wheelset with IRWs differs from other IRWs designs; in this case, only a flange can rotate independently from a wheel treat surface about the axis of rotation. Further, this research presents an analysis of a friction forces distribution of the friction forces in a contact of a flange and a rail head and a comparison with an SW. The obtained results allow concluding that it is advisable to use the wheels with the perspective wheel design (including independently rotating) to reduce the resistance to movement and improve the running properties of a railway vehicle for safety.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2022, 115; 93--106
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Driver performance through the yellow phase using video cameras at urban signalized intersections
    Autorzy:
    Al-Mistarehi, Bara’ W.
    Alomari, Ahmad H.
    Obaidat, Mohammed T.
    Al-Jammal, Areen A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203849.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    driver behavior
    signalized intersections
    red light running
    yellow phase
    zachowanie kierowcy
    skrzyżowanie z sygnalizacją
    przejazd na czerwonym świetle
    żółta faza
    Opis:
    The main objective of this research is to examine the influencing parameters of driver performance through the yellow phase at urban signalized intersections with and without red-light running (RLR) cameras. Data were collected to include the intersection type, vehicle type, turning movement type, whether the vehicle position is in a platoon or not, presence of RLR cameras, green light flash devices, pedestrians, and pavement markings. A total of 2168 driver observations were extracted. Only 33.3% of the drivers stopped before the stop line, 59% of the drivers passed the intersection through the yellow phase, and 7% of the drivers committed RLR violations. The results showed that drivers were more likely to stop before the stop line through the yellow phase at locations with RLR cameras, green light flash devices, pavement markings, where pedestrians were present, and at a four-leg intersection. Chi-square tests indicated that all parameters had a significant impact on driver performance, except for the type of turning movement.
    Źródło:
    Transport Problems; 2021, 16, 1; 51--64
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the predictability of the vertical impact of rail vehicles running gear on rails considering weather conditions and wagon suspension load
    Autorzy:
    Steišūnas, Stasys
    Vaičiūnas, Gediminas
    Bureika, Gintautas
    Sánchez, Celestino
    Powiązania:
    https://bibliotekanauki.pl/articles/2203877.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    running gear
    wheel-rail interaction
    measuring systems
    correlation of measured value
    podwozie
    interakcja koło-szyna
    systemy pomiarowe
    korelacja wartości mierzonej
    Opis:
    The faulty running gear of rail vehicles can be identified by the results of measurements of vertical forces caused by wheel running surface damages or other wrongness of bogie suspension. Several different automatic diagnostic systems are used in European railways (operating while the trains are in service) to detect damage to rail-wheel running surfaces. The principles of this trackside equipment operation and the reliability of their measurements may differ noticeably. This is especially true in different seasons of the year (winter/summer). Data collection and aggregation results should be checked in equivalency (comparability). The authors compared the efficiency of different automatic systems in detecting wheel failures according to wheel-rail loads in different seasons of the year and presented their results. The authors also compared the similarity of results of the different measurement systems.
    Źródło:
    Transport Problems; 2022, 17, 4; 67--78
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of genetic algorithm and neural network approaches for the prognosis of mechanical idle running losses in agriculture tractor transmission
    Autorzy:
    Ivanov, Rosen
    Ivanova, Donka
    Powiązania:
    https://bibliotekanauki.pl/articles/2203908.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    tractor transmission efficiency
    idle running
    losses
    neural network
    genetic algorithm
    sprawność przekładni ciągnika
    bieg jałowy
    straty
    sieć neuronowa
    algorytm genetyczny
    Opis:
    An experimental investigation of mechanical idle running losses in an agriculture tractor transmission was used to collect a wide range of data. The influence of the engine rotation speed, the number of switched-on gears, and the oil level in the transmission gearbox on the idle running losses was determined. Adequate regression models in cases of switched-on and switched-off PTO were received. A genetic algorithm was used to optimize mathematical models obtained using regression analysis. A feedforward artificial neural network was also developed to estimate the same experimental data for mechanical idle running losses in transmission. A back-propagation algorithm was used when training and testing the network. A comparison of the correlation coefficient, reduced chi-square, mean bias error, and root mean square error between the experimental data and fit values of the obtained models was made. It was concluded that the neural network represented the mechanical idle running losses in tractor transmission more accurately than other models.
    Źródło:
    Transport Problems; 2022, 17, 3; 51--59
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptation of rail passenger car suspension parameters to independently rotating wheels
    Autorzy:
    Vaičiūnas, Gediminas
    Steišūnas, Stasys
    Bureika, Gintautas
    Powiązania:
    https://bibliotekanauki.pl/articles/2098090.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    railway
    Nadal criterion
    Sperling's comfort index
    running gear
    independently rotating wheels
    kolej
    Kryterium Nadala
    wskaźnik komfortu Sperlinga
    podwozie
    niezależnie obracające się koła
    Opis:
    This study aimed to adjust the rail passenger car running gear parameters by adapting them to independently rotating wheels. The most important aspect was the safety of the passenger car running in terms of derailment; thus, the values of the Nadal criterion were calculated first. Another aspect to consider is passenger comfort based on the values of Sperling’s comfort index according to the rail passenger car speed. The modes of suspension behaviour during operation were considered in two typical conditions: on a straight track section and on a curve with a 200-m radius. Calculations were performed using Universal Mechanism software. The results are interpreted in the paper, and the final conclusions of this study are given.
    Źródło:
    Transport Problems; 2021, 16, 1; 215--226
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental determination of forces through measurements of strains in the side frame of the bogie
    Autorzy:
    Boronenko, Yuriy
    Rahimov, Rustam
    Powiązania:
    https://bibliotekanauki.pl/articles/2098166.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    running dynamic tests
    dynamic addition coefficient
    frame force
    side frame
    load
    strain gauge
    connection scheme
    prowadzenie badań dynamicznych
    współczynnik dodatku dynamicznego
    siła ramy
    rama boczna
    obciążenie
    tensometr
    schemat połączeń
    Opis:
    This paper investigates the influence of longitudinal and lateral forces on the accuracy of measurements of vertical forces for three-piece bogies. Theoretical studies of the loading of the bogie side frame have been carried out using the finite element method under the action of forces from a wheelset. The places of installation of strain gauges and the method of processing the received signals are determined. A method has been developed for measuring the vertical and lateral forces, which makes it possible to increase the accuracy of measurements of the vertical force, with the help of which the safety of movement is assessed during running dynamic tests and to ensure the simultaneous measurement of vertical and lateral (frame) forces transmitted to the boogie side frame, which will allow to reduce the number of strain gauges for measuring the considered forces during tests.
    Źródło:
    Transport Problems; 2021, 16, 3; 199--211
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Noise control of the beginning and development dynamics of faults in the running gear of the rolling stock
    Autorzy:
    Aliev, Telman
    Babayev, Tofig
    Alizada, Tahir
    Rzayeva, Narmin
    Powiązania:
    https://bibliotekanauki.pl/articles/1841181.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    rail transport
    running gear
    rolling stock
    noise
    control
    fault
    accident
    intelligent system
    information attributes
    sets
    correlation
    spectral analysis
    transport drogowy
    podwozie
    tabor kolejowy
    hałas
    sterowanie
    wada
    wypadek
    system inteligentny
    atrybut informacyjny
    Opis:
    In contrast to traditional systems for monitoring fault of the running gear of the rolling stock, this paper proposes a technology of noise control at the onset of defects. The authors consider the possibility of creating an intelligent system that can perform noise diagnostics with the indication of the beginning of the latent period of the initiation of typical defects preceding faults. To this end, using the noise technology, sets of reference informative attributes are created in the training process. The reference sets, in turn, are used to determine the condition of the object at the beginning of the development of defects by comparing them with current noise estimates. It also allows controlling the dynamics of the development of defects.
    Źródło:
    Transport Problems; 2020, 15, 2; 83-91
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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