A Study On The Finite Element Modeling Of Vehicle's Engine Front End Accessory Drive System

This paper conducts a research of the finite element modeling method on the auto-tensioning serpentine belt driving system,and builds the finite element model of the serpentine belt driving system based on experimental validation step by step.Construct a experiment table of 5-wheel belt driving system and analyze the influence of the tensioner's essential parameters on the system's dynamic features.The optimized stiffness and damping of tensioner are used to redesign the structure of tensioner.The main contents and results are listed as below:(1)Analyzing the structure of a tensioner of vehicle Engine Front End Accessory Driving system(EFEAD),building the mathematical model of the relationship between torque and rotational angle and making a simplification of it.Based on the simplification of mathematical model,the simplified finite element model is built to analyze the transient state under external loading.The results show that it's convenient to adjust the decoupling stiffness and damping of simplified finite element model,and the simulation results agree with the experimental data well,and that the computational efficiency increases obviously due to the decreased number of mesh of simplified model.(2)Conducting a research on the finite element modeling of serpentine belt based on the overlay constitutive model of rubber.Then making a transient state analysis of tensioning on the finite element model of serpentine belt.The results show that the simulation results agree with the experimental data well,thus verifying the validity of the finite element model.(3)Designing,building and debugging the auto-tensioning 5-wheel serpentine belt driving system and acquiring the data of driving and driven speed,the cross force of belt and transverse vibration of belt.Then building the finite element model of experimental system,and making a transient state analysis.The results show that the slip rate and cross force and transverse vibration agree well with the experimental data,thus verifying the validity of the finite element model.(4)Based on the finite element from(3),conducting an influence analysis of the stiffness and damping of model(1)on the transverse vibration.The results show that the transverse vibration decrease first and then increase when the stiffness and damping increase.(5)based on the optimized results of(4),resigning the structure of tensioner,then building its finite element model,and conducting a transient state analysis.The simulation results agree well with theoretical designing data,thus verifying the feasibility of the redesigning model.