Analysis On The Effect Of Vehicle Vibration On Driver’s Dynamic Cerebral Autoregulation

The driver’s sudden stroke and cerebral hemorrhage that are not controllable are easy to cause serious traffic accident. One important reason of driver’s cardiovascular and cerebrovascular diseases is vehicle vibration. More and more researchers study the effect of vehicle vibration on driver’s dynamic cerebral autoregulation.A new method of assessing driver’s dynamic cerebral autoregulation is developed, which is based on analyzing the relationship between oscillations in near-infrared spectroscopy (NIRS) measured cerebral oxyhaemoglobin (HbO2) and arterial blood pressure (BP) in subjects. Dynamic cerebral autoregulation refers to the properties of the brain vascular bed to maintain cerebral perfusion despite changes in blood pressure. Dynamic cerebral autoregulation describes the regulatory response of cerebral haemodynamic variables to changes in blood pressure. Dynamic cerebral autoregulation may be impaired in long time driving, which is the reason of causing driver’s cardiovascular and cerebrovascular diseases. Analyzing the relationship between cerebral haemodynamic variables is a useful method to assess driver’s dynamic cerebral autoregulation.Phase dynamic analysis affords the framework of analyzing the non-linear and non-steady cerebral haemodynamic variables, which overcomes the limitation and deficiency of early method. Phase dynamic analysis as a new method has new insight in dynamic cerebral autoregulation, which has important influence on studying driver’s dynamic cerebral autoregulation.Continuous recordings of HbO2 and BP are measured with signal preprocessing and de-nosing. After wavelet transform of signals we propose wavelet analysis and phase dynamic analysis to analyze the relationship between HbO2 and BP. With statistically significant differences found in different frequency groups, analyze the effect of vehicle vibration on driver’s dynamic cerebral autoregulation.Dynamic cerebral autoregulation is not only regulated by cerebral and cardiac activity but also neurogenic system, local vascular smooth muscle and vascular endothelium. Analyzing the result of the effect of vehicle vibration on driver’s dynamic cardio-cerebral autoregulation aims to provide the theory of vehicle design. To alleviate the vibration of the ground to the human body, we may reduce the vibration from three aspects:the design of the automobile tire, the design of the suspension damping system, and the seat design. Avoiding human sensitive frequency, avoiding resonance vibration frequency, reduce the risk of the pilot sudden stroke in the process of driving.