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Wyszukujesz frazę "speed vehicles" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Quick Handover in 5G for High Speed Railways and Highways Using Forward Handover and PN Sequence Detection
Autorzy:
Kawser, Mohammad T.
Abir-Hassan, Kazi Md.
Haque, Md. Atiqul
Ahmed, Sakif
Akram, Mohammad Rubbyat
Powiązania:
https://bibliotekanauki.pl/articles/2202998.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
5G
High Speed Vehicles
Forward Handover
PN Sequence
Radio Link Failure
Ping-Pong
Opis:
The cellular users, on high speed railways and highways, travel at a very high speed and follow a nearly straight path, in general. Thus, they typically undergo a maximum frequency of handovers in the cellular environment. This requires a very fast triggering of the handover. In the existing method of handover in 5G cellular communication, for high speed users, neither the decision-making of handover nor the triggering of handover is sufficiently fast. This can lead to poor signal quality and packet losses and in the worst case, radio link failure (RLF) during a handover. This paper proposes a forward handover based method, combined with PN sequence detections, to facilitate a quicker handover for high speed users on railways and highways. The proposed method adds some complexity but can offer a significant improvement in the overall handover delay. A simplistic simulation is used to demonstrate the improvement of the proposed method.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 147--153
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and control of nonlinear vibration of autonomous vehicle passing through hybrid consecutive speed control humps
Autorzy:
Yang, Zhiyong
Wang, Long
Yu, Yanjun
Mou, Zhenping
Ou, Minghui
Powiązania:
https://bibliotekanauki.pl/articles/2173727.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
autonomous vehicles
hybrid consecutive speed control humps
nonlinear vibration
safety
comfort
pojazd autonomiczny
próg zwalniający
wibracje nieliniowe
bezpieczeństwo
komfort
Opis:
In order to improve the safety and comfort of autonomous vehicles passing through the expressway, relevant departments of expressway construction often design and lay consecutive speed control humps (SCHs) with cross-sections of different shapes according to different road conditions, such as the combination of trapezoidal and sinusoidal SCHs. In this paper, we conduct a study about the nonlinear dynamic characteristics of the autonomous vehicle passing through hybrid SCHs. Firstly, a four-degree-of-freedom (4-DOF) nonlinear model of the vehicle suspension and the speed coupling excitation model under hybrid SCHs are established. Then the fourth-fifth order Runge–Kutta method is used to simulate the nonlinear system, and its nonlinear dynamic characteristics are analyzed. The results show that chaotic motion occurs when the vehicle passes through hybrid SCHs, and the speed range of chaotic motion is obtained. Then, a direct variable feedback control method is used to suppress the chaotic vibration of semi-active suspension vehicles, and the effect is verified by simulation experiments. Finally, this paper presents a multi-objective optimization model based on a genetic algorithm (GA) for active suspension vehicles. The optimization model selects the vertical displacement and pitching angle of the vehicle body as the objective function. The research results of this paper can provide information on the ride comfort’s optimization for autonomous vehicles passing through hybrid SCHs and on the design of vehicle suspension system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143643
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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