Optimization method for highway horizontal curve radius safety design based on vehicle side-turn and side-slip virtual test

Abstract

The invention discloses an optimization method for highway horizontal curve radius safety design based on a vehicle side-turn and side-slip virtual test. The method comprises the steps that 1, an optimization objective function Q(r) is established; 2, a driver-vehicle-target section virtual test simulation platform is constructed; 3, dynamic indicators of a vehicle running at a design speed are acquired, and values of the lateral acceleration rate LTA<r> and the load transfer rate LTR<r> are calculated; 4, if LTA<r> is smaller than or equal to 0.9 and LTR<r> is smaller than or equal to 0.9, the value of Q(r) is calculated, and the step 6 is skipped to; if LTA<r> is not smaller than or equal to 0.9 and LTR<r> is not smaller than or equal to 0.9, the step 5 is skipped to; 5, the highway horizontal curve radius r is increased by delta r, and the steps 2, 3 and 4 are repeated; 6, the line segment length l between the current radius and a horizontal curve adjacent to an optimal objective horizontal curve is calculated; if r is greater than or equal to r<max> or l is smaller than or equal to l<min>, the step 7 is skipped to; if r is not greater than or equal to r<max> or l is not smaller than or equal to l<min>, r is increased by delta r, and the steps 2, 3 and 4 are repeated; 7, different r-value virtual test simulation results are compared, and the r enabling the Q(r) value to be minimum is selected to serve as the optimal design scheme. The optimization method is rapid and effective for safety of horizontal curve radius design schemes of a highway at all stages.

Description

technical field [0001] The invention belongs to the field of road safety research and scheme optimization, and in particular relates to an optimization method for safety design of highway flat curve radius based on vehicle rollover and sideslip virtual test. Background technique [0002] Rollover and skidding occupy an important proportion in all types of traffic accidents, and are likely to cause large personnel and economic losses. According to the statistics of NHTSA (National Highway Traffic Safety Administration <USA> National Highway Traffic Safety Administration), the incidence of vehicle rollover is about 5%, but the death rate caused by rollover accidents is as high as 30%. Under normal driving conditions, the unreasonable road alignment, especially the small curve radius is an important cause of vehicle rollover and sideslip accidents, and it is also the most controllable factor. Therefore, optimizing the horizontal curve of the highway is of great significa...

AI Technical Summary

Problems solved by technology

Most of the optimization methods are based on empirical principles and direct visual experience of the route. There is no clear comparison of optimization results and specific operation steps, and it is highly dependent on the experience of technicians.

On the other hand, the measurement standard of optimization results is mostly based on the predicted speed, and the current speed prediction model is not mature enough to represent the real vehicle speed that changes at any time, and the result will have a large error

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