关键词: 公路运输, 回旋线, 小波变换, 方向盘转角, 驾驶模拟

Abstract:

To identify the factors that are closely related to driver's steering behavior on the spiral segment of a twolane highway, this study performed driving simulation experiments and collected steering wheel angle data from 15 drivers on 72 curves with different curve radius, turning direction, and spiral length. The Wavelet transform was used to decompose the spatial sequence of steering wheel angle signal. Then a co-relation analysis was conducted to examine the variation of natural steering behavior and trajectory correction behavior under different curve radius and spiral length conditions. The results show that natural steering distance at entrance spiral is significantly affected by curve radius and spiral length, but the natural steering distance is not affected by the turning direction. At entrance spiral, drivers are less sensitive to the route radius change when the curve radius increases. For the trajectory correction behavior, the average swing amplitude of steering wheel decreases with longer spiral length when radius is fixed. However, the rotation rate of steering wheel for correction appear to increase with longer spiral length. The average swing amplitude and rotation rate of steering wheel for correction at exit spiral are higher than those at entrance spiral. When the length of spiral is close to the natural steering distance, the average swing amplitude of steering wheel and the rotation rate are both at low levels. Therefore, it is reasonable to take the natural steering distance as the ideal spiral length.

Key words: highway transportation, spiral, wavelet transform, steering wheel angle, driving simulation