Study Of Radial Tire Dynamics And Rolling Noise Analysis

The main function of the tire was to support self-weight and load,transfer force to the road and the buffer vibration;and its dynamic characteristics not only affected the stability,the wet skid resistance and the oil consumption level of the tire rolling,but also affected the rolling noise value of the tire.With the continuous improvement of driving speed,all kinds of tires were becoming more and more high-performance and low-noise.However,at present,the performance of the other side was often increased at the expense of reducing the performance of one side,but tires having both superior performances could not be obtained at the same time.This topic built a rim-tire-road coupling system and used ABAQUS software to study and compare the grounding performance and dynamic characteristics under static load,driving,braking,free rolling,camber rolling,slip rolling,or under combined conditions.In comparison,it was found that with the gradual increase of the camber or the slip angle,the footprint exhibited an evolution from a rectangle to a trapezium to a triangle.It would continues to expand to the unilateral shoulder,resulting in aggravation of unilateral wear.The Vibration modal based on complex eigenvalue extraction was discussed.Under the rolling condition of the tire,complex eigenvalue extraction was needed in order to get a more accurate vibration modal.The transient dynamic characteristics of the coupling system were studied.It was found that the radial response of the rim center was cyclically changed.When the tire was impacted by a bump,the dynamic characteristics changed obviously,mainly due to the inertia effects.The acoustic equations,boundary conditions,acoustic-structure coupling equations and steady state solution based on acoustic boundary element were derived in this topic.The LMS Virtual.Lab Acoustics module was used to perform numerical acoustic simulation of tire rolling noise.By investigating the distribution of the sound field,it was found that the near-field noise had directivity,and the directivity of the far-field noise was not obvious.But the trend of the spectrum characteristic was the same,what's more,the difference of the sound pressure level was about lOdB(A).Comparing the experimental data of indoor noise,it was found that the influence of complex patterns on the rolling noise was significant,and the rolling noise value of the vertical groove pattern and the smooth tire was similar.Based on the above simulation methods,the influence of acoustic-structure coupling on tire dynamics and rolling noise was explored.It was found that its effect on static load and steady-state rolling analysis results was limited,but the natural frequency could be increased.And in the range of 150?250Hz,the tendency to produce vibration noise was very obvious.The frequency range of the rolling noise generated by the acoustic-structure coupling model is mainly from 50 to 375 Hz;however,the air cavity contributed a steady sound pressure level of 8 dB(A)to the rolling noise.By comparing with the experimental results,the validity of the model and the accuracy of numerical acoustics were verified.The numerical simulation results of tire dynamic characteristics and rolling noise could provide qualitative theoretical guidance and quantitative scientific basis for the development of high performance and low-noise tires.