Research In Dynamic Model And Parameter Identification Of Human-chair System For Vehicle Handling Stability

Smallscaleelectriccarsetlightweight,miniaturization,electricin a body, has theobviousadvantageof energy saving and environmental protection. It is will become animportantdirection ofdevelopment of the automotive industry. However, the carproduced the newproblems of academic and technicalin theoperation stability.Based on the National Nature Science Fund-Research on Modeling Method andBehavior Coupling of Human-Machine Dynamics for Small Scale Electric Vehicle andvehicle handing stability, the dynamical modeling of person-chair system has been made.The parameter of this model has been identified.The main content of this paper is as follows:First, according to the lumped parameter modeling method,twelve DOFperson-chair mathematical model has been made based on three DOF person-chairmodel and nine DOF person-chair model.This linear model is consisting of two mass,eighteen springs and eighteen damping. It can rotate and translate in Longitudinal,vertical, horizontal.Second, the person-chair system vibration test stand has been developed based onthe need of test. It is through the assembly of different anddriving crank connecting rodmechanism by electric machinery,realization to the6direction of human body vibration.The frequency of test bed is0.5~5Hz and amplitude of4mm.Third, we used a micro aviation attitude system to detect the linear accelerationand angular velocity of human body and bottom plate.Establishing tested humanbody model in ADAMS. According to GB/T17245-2004, we calculated the center massand rotary inertia of human. The acceleration and angle velocity of mass center has beencalculated through coordinate transformation.Finally, a model of person-chair system has been made in ADAMS. According tothe simulation results of the model, simplified the motion equations of the body affectedby the vibration. The stiffness, damping of the person-chair system model in the case oflow frequencies were identified by using genetic algorithm of MATLAB and leastsquares method.The developedperson-chair system dynamic model and the identified parameters ofthe model in this paper demonstrated a new direction of the design of micro-electricvehicle, is one aspect of human-machine dynamic coupling interactive effects. The model built in this paper offered a brand new idea to the research of person-chairinteraction, and possessed important reference values.