Method for evaluating design rationality of circular curve road section

Abstract

The invention provides a method for evaluating design rationality of circular curve road section. The method comprises the steps: establishing a vehicle system model of the lateral driving condition of a vehicle system on a circular curve road section with a vehicle side slip angle and a yaw velocity as variables; according to the vehicle system model established in the step S1, quantitatively analyzing the quantitative relation between the vehicle side slip angle and the yaw velocity when the vehicle stably runs on the circular curve road section; building a dynamic simulation system for lateral driving of the vehicle on the to-be-evaluated circular curve road section, and calculating a vehicle side slip angle and a yaw velocity when the vehicle is driven on the to-be-evaluated circular curve road section according to the vehicle system model in the step S1; and then evaluating the rationality of the design indexes of the circular curve road section by combining the quantitative relation between the vehicle side slip angle and the yaw velocity in the step S2. According to the method, the instability condition of the automobile in the circular curve road section is considered from the non-linear angle, so that the evaluation on the reasonability of the circular curve road section is more accurate and fits the actual condition.

Description

technical field [0001] The invention belongs to the technical field of transportation, and in particular relates to an evaluation method for the design rationality of a circular curve road section. Background technique [0002] Highway curve section is the key and difficult point of route design, especially the particularity of its linear condition and the complexity of driver's behavior, which has become a high-incidence area of ​​traffic accidents. my country's terrain is complex, and there are many small-radius sharp bends in mountainous expressways, which will cause vehicles to slide sideways, make them deviate from the fixed track or even become unstable, and cause a greater risk of accidents. According to statistical data, the accident rate on the curved section is higher than that on the straight section, and the severity of the accident is also obviously higher than that on the straight section. However, safety evaluation methods such as design codes only analyze th...

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Problems solved by technology

However, safety evaluation methods such as design codes only analyze the instability of vehicles on circular curve road sections from a linear perspective, and there may be complex geographical and vehicle factors in the actual road sections, so that the vehicle instability cannot be simply analyzed from a linear perspective. At present, there is a lack of a theoretical calculation and evaluation method that is closer to reality from a nonlinear perspective.

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