Study On Eeg Characteristics Of Driver And Analysis Of Driving Safety In The Undersea Tunnel Environment

With the rapid development of China’s economy and the rapid improvement of infrastructure,more and more undersea tunnels have been constructed and put into use.Affected by unfavorable factors such as changes in the illuminance of the undersea tunnel,longitudinal slope conditions and monotonous background environment,the undersea tunnel has frequent traffic accidents.Therefore,how to ensure traffic safety has become an important research topic in the operation and management of the undersea tunnel.In this paper,for the undersea tunnel,in the peak period of good weather,using the illuminance meter,EEG,video recorder and other experimental equipment,taking Qingdao Jiaozhou Bay undersea tunnel as the experimental site and carrying out the real vehicle experiment,simultaneously collecting the driver’s EEG data when passing through the undersea tunnel and the driving environment data of the undersea tunnel,using the relevant theories of mathematical statistics and EEG science to analyze the undersea tunnel The influence of road traffic environment on driver’s EEG.Based on the experimental data,the driving environment and human brain electrical signal of the undersea tunnel are analyzed,and the characteristic variables are extracted to determine the illumination,longitudinal slope and driving distance.The correlation between the EEG signal and the driving environment of the undersea tunnel is analyzed from the aspects of brain area,EEG frequency band,EEG characteristic quantity and environmental characteristic quantity of the undersea tunnel,and the best research area of each environmental characteristic quantity is determined.The EEG power spectrum is classified according to the frequency,and the differences of EEG power spectrum in different study areas of the cross harbour tunnel are analyzed;The changes of EEG power of drivers in different study areas were analyzed,and the changes of the driver’s brain and activity in different brain areas were studied;The EEG power variation model of three driving environment characteristic variables(illumination,longitudinal slope and driving distance)and their coupling effects are established,and the driving safety of the subsea tunnel is analyzed based on the model.The results show that there is a general correlation between the driving brain electrical signal and the driving environment of the undersea tunnel.The brain waves of each brain area and frequency of the driver are involved in the driving process of the undersea tunnel,among which the frontal lobe area representing the movement center and the occipital lobe area representing the visual center are the two brain regions with the highest correlation with the driving environment of the undersea tunnel;Representing the driver’s concentration α wave β waves are the two brain waves with the highest correlation with the driving environment of undersea tunnels.The power spectral density of α wave and β wave in the entrance and exit section of the undersea tunnel is significantly higher than that in the non entrance and exit section,which makes the driver more excited and more nervous in the entrance and exit section of the undersea tunnel.In the first 50 meters of the entrance section and the last 50 meters of the exit section of the undersea tunnel,the power of β wave changes sharply and is at a high level the results show that there is a high degree of agreement between the power variation law and the illumination variation law of the undersea tunnel,and the occipital lobe is the most sensitive brain area to the illumination variation.When driving in different gradient areas,the larger the gradient is,the greater the β wave power is,and the more active the driver’s brain is;when driving through the gradient change areas,the brain activity level is significantly increased,but as driving away from the gradient change areas,the brain activity level will gradually decline;frontal lobe area is the most sensitive brain area to the gradient change.During the whole driving process of the undersea tunnel,the influence of driving distance on the driver’s EEG is slow and continuous.With the increase of driving distance,the driver’s EEG activity level gradually decreases,and the probability of fatigue driving will gradually increase.