【摘要】：隨著我國經(jīng)濟的發(fā)展及城市化的加快,汽車的保有量持續(xù)增長,道路安全問題日益嚴峻,而疲勞駕駛是導(dǎo)致交通事故發(fā)生的重要原因之一。所以及時發(fā)現(xiàn)并緩解駕駛疲勞并給予警報,對于降低交通事故的發(fā)生有重要意義。通過分析腦電信號檢測駕駛員的疲勞狀態(tài)并通過經(jīng)皮穴位電刺激緩解疲勞,對于駕駛疲勞的預(yù)警及緩解有比較顯著的作用。腦電是大腦活動最直接的反映,本文研究的方法可以基于腦電信號實時的檢測駕駛疲勞。首先把采集到的腦電信號進行小波包分解,提取出δ波(0.5～4Hz),θ波(4～8Hz),并對δ波、θ波進行功率譜分析,得到其功率譜密度,最后再求出0.5～8Hz內(nèi)信號的平均功率。把兩個不同時間段的平均功率進行對比,根據(jù)其對比情況來分析疲勞程度。當檢測到駕駛員的疲勞程度達到需要刺激的閾值后,開始對勞宮穴進行電刺激。通過實驗的驗證發(fā)現(xiàn),在有電刺激的情況下,受試者腦電信號中的慢波活動相對于沒有電刺激情況下的更弱。說明有電刺激情況下,受試者的疲勞程度更輕。結(jié)果表明該系統(tǒng)對緩解駕駛疲勞有一定的效果。
[Abstract]:With the development of our country's economy and the acceleration of urbanization, the number of cars keeps increasing, and the problem of road safety is becoming more and more serious. Fatigue driving is one of the important reasons leading to traffic accidents. So it is very important to find and relieve driving fatigue and give alarm in time to reduce traffic accidents. By analyzing the EEG signal to detect the fatigue state of the driver and relieve the fatigue through the electric stimulation of the transcutaneous acupoint, it has a significant effect on the warning and relief of driving fatigue. EEG is the most direct reflection of brain activity. The method studied in this paper can detect driving fatigue based on EEG in real time. Firstly, the collected EEG signals are decomposed by wavelet packet, and the 未 wave (0.5~4Hz) and 胃 wave (4~8Hz) are extracted. The power spectral density of 未 wave and 胃 wave is obtained by power spectrum analysis. Finally, the average power of the signal in 0.5~8Hz is calculated. The average power of two different time periods is compared and the fatigue degree is analyzed according to the comparison. When the fatigue degree of the driver reached the threshold of the need for stimulation, electrical stimulation of the Laogong acupoint was started. The experimental results show that the slow wave activity in EEG is weaker than that in the absence of electrical stimulation. The results showed that the subjects had less fatigue in the presence of electrical stimulation. The results show that the system has a certain effect on reducing driving fatigue.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：U492.8

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