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    Wyświetlanie 1-4 z 4
    Tytuł:
    Mechanical characteristics of ultra-shallow buried high-speed railway tunnel in broken surrounding rock during construction
    Autorzy:
    Hao, Shaoju
    Fei, Ruizhen
    Yu, Jia
    Powiązania:
    https://bibliotekanauki.pl/articles/2179933.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    skała pęknięta
    skała otaczająca
    posadowienie płytkie
    kolej dużych prędkości
    tunel
    symulacja numeryczna
    charakterystyka deformacji
    broken rock
    surrounding rock
    ultra-shallow buried
    high-speed railway
    tunnel
    numerical simulation
    deformation characteristics
    Opis:
    The mechanical state of broken surrounding rock during the construction of ultra-shallow buried high-speed railway tunnel is very complicated, seriously affecting the construction safety. Taking Huying Xishan tunnel on Beijing-Shenyang Line as engineering background, MADIS/GTS NX numerical simulation and field test methods are used to analyze the characteristics of stress field, overall displacement, horizontal convergence of tunnel sidewalls and vault settlement during construction. The main mechanical characteristics of ultra-shallow buried high-speed railway tunnel with broken surrounding rock include: (1) After the stress redistribution, the stress concentration occurs at the boundary of the tunnel sidewall and surrounding rock, and the vertical displacement of tunnel vault and bottom appears obviously. (2) The horizontal displacement on both sides of the initial lining is obvious, while the horizontal displacement on the upper and lower support is small. The maximum lateral displacement of the initial lining is 1.71 cm, while the maximum vault settlement of the lower invert is 9.3 cm. (3) Both the horizontal convergence and the vault settlement increase with time. The growth rate is large in the early stage and tends to be stable in the later stage. (4) Compared with exponential and hyperbolic functions, the logarithmic function is most suitable for regression analysis of horizontal convergence and measured vault settlement data, and its fitting accuracy is higher than 90%.
    Źródło:
    Archives of Civil Engineering; 2022, 68, 3; 645--659
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approach to suppress high-frequency resonance using model predictive and selective harmonic elimination combined strategy
    Autorzy:
    Chen, Sitong
    Chen, Xiaoqiang
    Wang, Ying
    Xiong, Ye
    Powiązania:
    https://bibliotekanauki.pl/articles/1841300.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CRH5 EMUs and traction power supply coupled system
    high-frequency oscillation
    high speed railway
    model predictive control (MPC)
    selective harmonic elimination pulse-width modulation (SHEPWM)
    CRH5 EMU i system sprzężony z zasilaniem trakcyjnym
    oscylacja wysokiej częstotliwości
    kolej dużych prędkości
    kontrola predykcyjna modelu (MPC)
    selektywna eliminacja harmoniczna modulacja szerokości impulsu (SHEPWM)
    Opis:
    High-frequency resonance is a prominent phenomenon which affects the normal operation of the high-speed railway in China. Aiming at this problem, the resonance mechanism is analyzed first. Then, model predictive control and selective harmonic elimination pulse-width modulation (MPC-SHEPWM) combined control strategy is proposed, where the harmonics which cause the resonance can be eliminated at the harmonic source. Besides, the MPC is combined to make the current track the reference in transients. The proposed control has the ability to suppress the resonance while has a faster dynamic performance comparing with SHEPWM. Finally, the proposed MPC-SHEPWM is tested in a simulation model of CRH5 (Chinese Railway High-speed), EMUs (electric multiple units) and a traction power supply coupled system, which shows that the proposed MPC-SHEPWM approach can achieve the resonance suppression and shows a better dynamic performance.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 415-430
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conception of modernization of a line section example in the context of a fast railway connection
    Autorzy:
    Mikulski, J.
    Gorzelak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/223739.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high speed rail
    HSR
    technical study
    fast railway
    pociąg szybkobieżny
    badanie techniczne
    szybka kolej
    Opis:
    For centuries, it is known that people always prefer to accommodate in the region where there is good transportation network. Proper organization of transportation is one of the key elements which influence the dynamics of the World economics system development. Thanks to infrastructure modernization which allows to transfer the goods between engaged parties, it is possible to increase production and commonly to intense exploitation of areas located near this infrastructure among others in industry purposes. With regard to increasing demand for effective and efficient transportation system, there is a real need to improve communication and transportation infrastructure. A chance for this target shall be modern high technologies, which allows running with very high speed and thus also to reduce journey time. For this purpose there were established and is still developing relatively new product – high speed rail which is supposed to revolutionize modern transportation system functioning in the World. The article calls attention on a chance for improving competitiveness of rail freight transportation in Poland thanks to developing high speed rail network. There is underlined also rationality of modernization of the rail line which connect the biggest cities in South part of Poland. The descriptive part of the article refers to the high speed rail system and its development conditions. The research part is a technical feasibility study about section Cracow – Katowice – Wroclaw and possibilities for adopting it to achieve high speed rail line parameters.
    Źródło:
    Archives of Transport; 2017, 44, 4; 47-54
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the shape of railway transition curves from the point of view of passenger comfort
    Autorzy:
    Zboiński, Krzysztof
    Woźnica, Piotr
    Bolzhelarskyi, Yaroslav
    Powiązania:
    https://bibliotekanauki.pl/articles/2067405.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-speed rail lines
    railway transition curves
    passenger comfort
    computer simulation
    optimisation
    pociągi dużych prędkości
    kolejowe krzywe przejściowe
    pasażer
    symulacja komputerowa
    optymalizacja
    Opis:
    In the past, railway transition curves were not used. Instead of it, a simple connection of the straight track and circular arc was applied. Nowadays, such simplicity is not allowed due to the increasing vehicle operating velocities. It is mainly visible in the high-speed train lines, where long curves are used. The article aims to develop a new shape of railway transition curves for which passenger travel comfort will be as high as possible. Considerations in this paper concern the polynomials of 9th- and 11th-degrees, which were adopted to the mathematical model of the mentioned shape of curves. The study's authors applied a 2-axle rail vehicle model combined with mathematically understood optimisation methods. The advanced vehicle model can better assign the dynamical properties of railway transition curves to freight and passenger vehicles. The mentioned model was adopted to simulate rail vehicle movement in both cases of the shape of transition curves and the shape of circular arc (for comparison of the results). Passenger comfort, described by European Standard EN 12299, was used as the assessment criterion. The work showed that the method using the 2-axle railway vehicle model combined with mathematically understood optimisation works correctly, and the optimisation of the transition curve shape is possible. The current study showed that the 3rd-degree parabola (the shape of the curve traditionally used in railway engineering) is not always the optimum shape. In many cases (especially for the long curves), the optimum shape of curves is between the standard transition curves and the linear curvature of the 3rd-degree parabola. The new shapes of the railway transition curves obtained when the passenger comfort is taken into account result in new railway transition curves shapes. In the authors' opinion, the results presented in the current work are a novelty in optimisation and the properties assessment of railway transition curves.
    Źródło:
    Archives of Transport; 2021, 60, 4; 205--217
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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