Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (2): 557-564.doi: 10.13229/j.cnki.jdxbgxb20200061

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Application of multi⁃fractal features of driving performance in driver fatigue detection

Shu-wei ZHANG(),Zhong-yin GUO(),Zhen YANG,Ben-min LIU   

  1. The Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University,Shanghai 201804,China
  • Received:2020-02-04 Online:2021-03-01 Published:2021-02-09
  • Contact: Zhong-yin GUO E-mail:zhangshuwei163@163.com;zhongyin@tongji.edu.cn

Abstract:

Driver fatigue caused by long-term driving is usually accompanied by a decline in driving performance. Therefore, driver fatigue threatens the safety of the drivers and passengers seriously. The development of driver fatigue detection technology can help remind the drivers and take relevant measures against driver fatigue, thereby improving traffic safety to a certain degree. The purpose of this paper is to improve the classification accuracy of the driver fatigue detection model. To achieve this goal, this paper introduces multi-fractal features of the driver behavior data. Six male subjects participated in the driving simulation experiment and UC-win/Road driving simulation software was used to collect driver behavior data such as driving speed, acceleration, steering wheel angle and steering wheel angular velocity. Indicators of the mean, the standard deviation and several different multi-fractal features of each kind of data were calculated. The changes of the drivers' subjective fatigue were also measured with a time interval of 600 s. And the relationship between the indicators and driver fatigue were measured. Additionally, the accuracies of driver fatigue detection models based on support vector machine (SVM) considering different features and different time window were compared. The research shows: The correlation between the singularity strength of acceleration (A0) and driver fatigue is significant; Compared with the correlation between other indicators and driver fatigue, that between A0 and driver fatigue is less affected by the time window width; The singularity strength of acceleration can help improve the accuracy of SVM; Compared with the time window of 15 s, a wider time window of 30 s can make the improvement more obvious. Therefore, it has certain application value in driver fatigue detection technology.

Key words: road and railway engineering, driver fatigue, traffic safety, multi-fractal features

CLC Number: 

  • U492.8

Fig.1

Driving simulation scene"

Table 1

Drivers′ information form"

驾驶员编号性别年龄/岁驾龄/年
A284
B307
C337
D4614
E4921
F5530

Fig.2

Driving performance data change chart"

Fig.3

Comparison of resampled data with raw data"

Table 2

Statistical characteristics of driving performance indicators"

指标描述15 s30 s
均值标准差均值标准差
SM行驶速度均值/(m·s-1)27.76912.40027.76412.441
AM加速度均值/(m2·s-1)0.1320.2130.1330.199
STM方向盘转角均值0.0110.0210.0110.021
SVM方向盘角速度均值0.0000.0010.0000.001
SSD行驶速度标准差/(m·s-1)0.8500.7191.6851.430
ASD加速度标准差/(m2·s-1)0.0790.0920.1120.095
STSD方向盘转角标准差0.0020.0050.0030.005
SVSD方向盘角速标准差0.0070.0190.0090.018

Table 3

Correlation analysis between driving performance indicators' statistical characteristics and driver fatigue"

时间窗宽度/s指标Spearman相关系数
15SM0.417**
AM0.321**
STM0.005
SVM-0.093
SSD0.398*
ASD0.371*
STSD0.302*
SVSD0.523**
30SM0.306
AM0.317
STM0.019
SVM-0.107
SSD0.322
ASD0.329
STSD0.179
SVSD0.342

Fig.4

Steering wheel angle and steering wheel angular velocity"

Fig.5

Fql~lhqdouble logarithmic graph of speed"

Fig.6

Fql~lhq double logarithmic graph of acceleration"

Table 4

Calculation of generalized Hurst exponent of speed and acceleration sequences"

趋势

函数

速度加速度
拟合公式R2拟合公式R2
DFA1y=0.984x-5.1270.954y=0.800x-3.8500.933
DFA2y=0.880x-4.9440.968y=0.705x-3.6870.939
DFA3y=0.767x-4.7390.984y=0.585x-3.4830.950
DFA4y=0.664x-4.5460.996y=0.484x-3.3110.956
DFA5y=0.582x-4.3900.997y=0.410x-3.1830.959
DFA6y=0.532x-4.2890.993y=0.359x-3.0940.959

Table 5

Multi-fractal characteristics of driving performance indicators"

指标描述15 s30 s
均值标准差均值标准差
速度序列的奇异强度S01.9530.1821.9380.202
速度序列的广义Hurst指数S10.5540.0790.5430.072
速度序列的标度指数S20.1080.1590.0860.145
加速度序列的奇异强度A01.5010.3931.4670.407
加速度序列的广义Hurst指数A10.3950.0800.3710.071
加速度序列的标度指数A2-0.2100.160-0.2580.140

Table 6

Correlation analysis between driving performance indicators′ multi-fractal characteristics and driver fatigue"

时间窗宽度/s指标Spearman相关系数
15S00.125
S10.310
S20.106
A00.511*
A10.273
A20.309
30S00.127
S10.299
S20.121
A00.527**
A10.270
A20.317

Table 7

Comparison of model information"

模型编号指标时间窗/s
(1)SM、AM、SVSD15
(2)SM、AM、SVSD、A015
(3)A015
(4)A030

Fig.7

Comparison of model accuracy"

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