Volume 39 Issue 2
Apr.  2021
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Article Navigation >  Journal of Transport Information and Safety  > 2021  >  39(2): 28-35
ZHANG Hang, CHU Zeyu, LYU Nengchao, DUAN Hezhu. Design Indices of Circular Curve Section Based on Lateral Stability[J]. Journal of Transport Information and Safety, 2021, 39(2): 28-35. doi: 10.3963/j.jssn.1674-4861.2021.02.004
Citation: ZHANG Hang, CHU Zeyu, LYU Nengchao, DUAN Hezhu. Design Indices of Circular Curve Section Based on Lateral Stability[J]. Journal of Transport Information and Safety, 2021, 39(2): 28-35. doi: 10.3963/j.jssn.1674-4861.2021.02.004
shu

Design Indices of Circular Curve Section Based on Lateral Stability

doi: 10.3963/j.jssn.1674-4861.2021.02.004
  • 1.

    School of Transportation, Wuhan University of Technology, Wuhan 430063, China

  • 2.

    Intelligent Transportation Systems Reasarch Center, Wuhan University of Technology, Wuhan 430063, China

  • Received Date: 2020-11-24
    Abstract
  • When a vehicle turns in a circular curve section with a small adhesion coefficient, its tires work in a nonlinear zone, and the lateral stability analysis method based on the linear theory would generate large errors. This paper focuses on the different characteristics of the 6-DOF nonlinear vehicle system model in nonlinear and linear domains. Under different speed and road adhesion coefficients, the radius and superelevation design indices of the circular curve section with the critical state of the vehicle system are calculated. The root locus method based on the linear theory and the phase plane method based on the nonlinear theory are used to analyze the lateral stability of vehicle systems in linear and nonlinear domains, respectively. Then, a sectional index of the circular curve considering the critical instability state of vehicles in both states is obtained. The results show that when the vehicle speed is 60 km/h, with the road adhesion coefficient of 0.24, and the superelevation less than 6%. The tires are in the nonlinear domain when the vehicle lateral instability occurs. Besides, a critical index of lateral instability is obtained using the phase plane method. When the vehicle speed is 60 km/h, the road adhesion coefficient is greater than 0.4, and the superelevation is between 4 and 10%. The tires are in the linear domain when the vehicle lateral instability occurs, and the root system is used. Then a critical index of lateral instability is obtained by trajectory analysis.

     

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