疲劳驾驶转向特征指标的个体差异敏感度分析

Sensitivities of Fatigue Driving Steering Features to Individual Difference

个体差异是影响疲劳驾驶识别的重要因素.为研究基于转向行为的疲劳驾驶识别受个体差异的影响,本文对疲劳驾驶转向特征指标的个体差异敏感度进行分析.通过实车试验获得自然驾驶数据,对正常和疲劳状态下的指标进行Kruskal-Wallis(KW)检验,以H统计量表示指标有效性;以H统计量最大的单被试为基础逐一与其他被试组成双被试组合,采用线性模型拟合双被试组合的H统计量和指标个体差异度,以斜率绝对值表征指标个体差异敏感度.研究获得9个转向特征指标的个体差异敏感度,结果表明,敏感度越低,指标有效性受个体差异影响越小,其中方向盘转角标准差的个体差异敏感度最低为2.056.本研究可为转向特征指标的性能评估及疲劳驾驶识别模型的特征选择提供参考.

Individual difference is important factor affecting identification of fatigue driving. For analyzing the effects of individual differences on fatigue driving identification based on steering driving behaviors, sensitivities of fatigue driving steering features to individual differences were analyzed. Naturalistic driving data was obtained by field driving experiments, features under normal and fatigue status were analyzed by Kruskal-Wallis (KW) test, H -statistics was used to indicate the effectiveness of features. Single participant with maximal H -statistics was used as basis to form double participants group with other participants one by one, H - statistics and individual difference degree for features of double participants group were fitted by linear model, and absolute value for slope was used to indicate sensitivities of features to individual differences. Sensitivities of nine steering features to individual differences is obtained, the lower sensitivity is, the less effectiveness of feature is affected by individual differences, and sensitivity for standard deviation of steering wheel angle to individual differences is the lowest whose value is 2.056. This study can offer references for evaluation of fatigue driving steering features' performances and feature selection for recognition model of fatigue driving.