Research On Dynamic Driving Posture Comfort Based On Physiological Signals

Driving posture comfort is an important component of car comfort,which is divided into static driving posture comfort and dynamic driving posture comfort.For the driver,dynamic manipulation is the main state in the driving process most of the time,and the comfort during the dynamic driving posture change can better reflect the driver's demand for driving comfort.It is of great significance to study the comfort of dynamic driving posture under different control element layouts to improve the overall comfort of the car.Driving manipulation is a typical man-machine operation.During this process,the movement of the limbs and the load applied by the manipulators reversely cause changes in the body muscle groups and joint loads.In order to study the discomfort of the dynamic driving posture,it is necessary to analyze the influence of the arrangement of the control parts on the human body load during the manipulation process,and to analyze the quantitative relationship between the human body load and the discomfort evaluation.The adjustment position of the seat,the arrangement of the pedal and steering wheel,and their operating force are all factors that affect the human body load.Obtain the muscle and joint load during driving state by means of EMG signal measurement or biomechanical theory calculation,so as to understand the driving discomfort from a deep level.This research comes from a school-enterprise cooperation project.It comprehensively uses experimental and simulation methods to study the impact of dynamic driving posture changes on manipulating discomfort.(1)According to common driving situations,design typical steering and acceleration and deceleration conditions,recruit skilled drivers and select representative vehicle models to carry out actual vehicle experiments,and collect driver's discomfort subjective evaluation of steering and pedal acceleration and deceleration operations,Subjective and objective data such as the surface EMG signals of the manipulate muscle group,vehicle man-machine layout parameters and control force parameters,and analyze the subjective comfort control force range under different working conditions.(2)Use AnyBody software to establish a driver's musculoskeletal biomechanics model,build a simulated driving environment that can realize steering wheel and pedal manipulation,and simulate the experimental conditions,analyze and calculate the muscle force and activation degree of the relevant muscle groups during the manipulation process.(3)Use linear regression and saliency analysis to compare the correspondence between the driver's subjective discomfort evaluation,measured surface EMG signals and simulated EMG data in experimental conditions,and analyze the relationship between the subjective evaluation and muscle activation Consistency,and verify the accuracy of the simulation model for real vehicle manipulation experiment simulation.(4)Use RBF neural network to analyze the quantitative relationship between the activation degree of manipulation muscle groups and the evaluation of manipulation discomfort,and establish pedal and steering wheel manipulation discomfort evaluation models respectively.Taking a 50 th percentile male driver as an example,design orthogonal simulation experiments to analyze the impact of pedal and steering wheel layout on the discomfort operation under typical working conditions,and finally obtain the optimal layout plan to improve the driving comfort.