Rheological Characteristics Of Drivers’ Muscle Fatigue Under Monotonous Environment On Grassland Highway

The monotonicity of road traffic environment is considered to be the most common and important external inducing factor in driving fatigue.The monotonous sex of the road mainly refers to the traffic flow is small,the visual stimulation of the roadside is repeated and single.The monotonous road environment will have a negative effect on drivers.As the grassland road has small traffic flow,many long straight lines,and the landscape and linear shape of the roadside are single,it is easy for drivers to cause fatigue feeling when driving on the monotonous grassland road.The phenomenon of driving fatigue on grassland roads has seriously threatened the traffic safety,and the assessment of driving fatigue on grassland roads is still a huge challenge.Therefore,a scientific and reliable method to evaluate driving fatigue is of great practical significance to reduce traffic accidents and casualties.Based on the grassland highway,this thesis explored the relationship between the environmental stimulation of grassland highway and the fatigue of drivers’ neck,waist and shoulder muscles through a 150 min driving simulation experiment on grassland highway.According to the rheological theory of materials,the driver fatigue accumulation model and fatigue recovery model are derived by introducing time variables.Based on physiology and rheology,the driving fatigue mechanism is explained from a new perspective to provide a theoretical basis for safe driving of grassland highway drivers.The following conclusions are drawn:(1)It is feasible to describe the local muscle fatigue of drivers on grassland highway with viscoelastic properties in rheology,and it can more accurately describe the variation rule of the MF value of the local muscle of drivers.Therefore,it is valid to assume that the driving fatigue on grassland highway has rheological properties.(2)The fatigue degree of neck,shoulder and waist muscles of drivers on grassland highway gradually deepened with the increase of driving time.Driving time is one of the most important factors leading to driver fatigue.Among the three parts of the neck,shoulder and waist muscles of the drivers on grassland highway,the fatigue degree of the neck and waist muscles is deeper than that of the shoulder muscles.(3)Compared with male drivers,the EMG curve of female drivers fluctuates more,and the muscles of female drivers are more sensitive to fatigue.Gender difference has certain influence on driver muscle fatigue.(4)At the beginning of driving,when the driver entered mild fatigue,the ability of neck and shoulder muscles of female drivers to recover immediately was stronger than that of male drivers,and the ability of male drivers to recover immediately when waist muscles were tired was stronger than that of female drivers.(5)When drivers entered moderate fatigue,the retarded recovery ability of neck,shoulder and waist muscles of male drivers was better than that of female drivers.For longer driving tasks,male drivers should be more reliable.