Vibration And Aerodynamic Noise Analysis Of Auto Rearview Mirror

Auto rearview mirrors are important parts of car and influent the driving safety of cars.During the driving process,the vibration of rearview mirrors affects the driver’s vision directly,and critical vibration may even cause an accident which may make someone die.This study has shown that increasing the natural frequency of the rearview mirror can improve the vibration of the mirror effectively.Therefore,in the design and development process,we need to optimize the structure of the rearview mirror so that the modal,stiffness and strength of the installation point meet the design target value.As a component outside the car,it has a great contribution to aerodynamic noise under high speed conditions.To decrease the aerodynamic noise,it is necessary to optimize its shape and geometric size and sealing system around the rearview mirror.The first,the finite element method were used to analyze the rearview mirror’s dates,such as the modal,stiffness and strength.Through optimizing design,these dates meet the target value requirements.Secondly,the vehicle CFD simulation model was established to perform steady state calculation.We use CFD software to perform transient flow calculation on the flow field around the rearview mirror,output the pressure of the windshield surface and the airflow velocity around it from the calculation results.Then we import it into the acoustic software to establish the aeroacoustic model and vibration acoustic model and simulation calculation.The third,by performing acoustic tests in the aeroacoustic wind tunnel,it was verified that the wind noise performance of the rearview mirror could meet the target requirements.