Investigate Into Tire Vibration Noise Contribution Analysis And Reduction Method

While the rolling speed of heavy duty tire is over 60km/h, the tire noise will represent the main part, almost over 30% of the whole vehicle noise. In order to improve the noise problem, both the EU tire labeling and the Chinese Technical Specification for green tire stipulated clear requirements and specific implementation deadlines on rolling tire noise. However, 50% of the Chinese tires can not reach the second phase of the standard requirement, which has brought great pressure to the development of the Chinese tire industry. Therefore, investigating into the tire vibration noise and the noise reduction method is of great significance to the design of low tire noise and the tire manufacturing sustainable development in our country.The 3-dimensional finite element analysis model of all steel heavy truck tire295/80R22.5 was established by ABAQUS. Then, tire finite element analysis model was verified by using the tire-ground pressure distribution experiment, stiffness experiment and model test.Under the peak frequency noise, acoustic contribution analysis method was proposed to study the influence of the different parts of tire contour on tire vibration noise. Tire tread and sidewall were figured out as the positive acoustic contribution panels to the tire vibration noise by using amplitude-phase method. Based on which,in order to reduce tire vibration noise, the tire tread and sidewall were added polyurethane damping materials to suppress the vibration response of the tread and sidewall. Above all, the mechanism of reducing noise was revealed through the acoustic contribution and the vibration acceleration response.By means of model acoustic contribution analysis method, the influence of each various tire modals on peak noise was studied, and the most sensitivity modal is obtained. Then, sensitivity analysis method was used to study the effect of the mass of the tire rubber material, the mass of tire steel cord and the stiffness of tire steel cord on the sensitivity modal’s natural frequency and the generalized mass. Theresults show that reducing the mass of tire tread and sidewall, carcass layer structure steel cord and 2-belt layer structure steel cord can effectively reduce tire vibration noise. Furthermore, increasing the stiffness of carcass layer structure steel cord and3-belt layer structure steel cord can effectively reduce tire vibration noise.Inspired by the sensitivity analysis results of decreasing tire sidewall mass can reduce tire vibration noise and use the carcass chord contour design method to redesign the tire and tire sidewall was lightweight redesigned. Compared to original design tire, the redesigned tire reduces 7.48% sidewall mass and 1.98 dB tire vibration noise respectively. Then, the mechanism of reducing tire vibration noise was analyzed through acoustic contribution analysis. The redesigned tire reduces noise pressure of positive acoustic contribution(tire tread and sidewall, respectively)and increases the numbers of the negative panels. As a result, the tire vibration noise is reduced.