| Tire noise is the main component of vehicle noise.Tire noise about 80% of the proportion for the vehicle noise,when is running at high-speed way.So,for the tire noise problem,the EU released the 2009/1222 / EC tire labelling regulations,which provides variety types of tire specific noise limits value.It is serious challenges in the China's tire industry and the only one solution for the technical barriers to trade that overcome technical bottlenecks for the tire noise.Air-pumping noise is the main problem with the tire noise,and flexible design in the groove structure tire is an effective way to reduce air-pumping noise.Currently,more and more researchers force on the tread pattern to reduce tire noise.However,due to the difficulty of experimental research on the air-pumping noise,the finite element simulation technology is developing rapidly.Therefore,it is an important task to study the simulation method and application of complex pattern groove aerodynamicsIn this paper,the research object is tire complex pattern groove;it used the finite element software ABAQUS for the transient rolling analysis to the compound groove in the 12.00R20 truck tire.It uses of Python language to programming then get results that are the different speed groove conditions of the boundary condition in the aerodynamic simulation.The large eddy simulation and dynamic grid technology based on ANSYS Workbench simulation platform,there are carry out a bi-directional flow coupled simulation through System Coupling module that presents a simulation method for aerodynamic simulation of complex pattern groove.The simulation results show the complex pattern groove of the flow field and the motion rule of the vortex and compared the state of the flow field in the presence of small trenches.Finally,based on the results of the flow field calculation,the FW-H acoustic calculation method is used to establish the noise prediction method and discussed the influence of the groove structure on the pumping noise.The method of this paper that the simulation calculation for the complex pattern groove,and then obtained flow field of the gas flow in the pattern groove.There are several results of this system shows the flow field at the outlet of the pattern groove is complex;The airflow into the external flow field,which is affected by the external air,and the eddy current begins to form on the surface of the block at both ends of the outlet,and the vortex is periodically formed in the flow field and spread out to the end.This is the important reason of the air-pumping noise;which process causes the pressure fluctuation of the flow field.On the other hand,the small trench played the role of the shunt,the eddy current intensity and flowed velocity than the small ditch without a complex groove is small,to verify the multiple channel grooves in the design of rationality.The paper prediction based on the result of the flow field of the complex pattern groove's aerodynamic noise.The results show the air-pumping noise is the high-frequency noise,and the sound pressure change is the largest at the moment of the modification of the groove state,and small groove in the presence of complex pattern groove pump gas noise is smaller.The increase of the width and height of the groove will affect the pumping noise more severity.However,for the groove,the growth of the wall draft angle will reduce the air-pumping noise;the groove height has the greatest influence on the pumping noise and the width is the smallest one,and the secondly is draft angle.This paper provides the ideal reference and numerical simulation method for tire tread structure design,and also provides the research foundation for improving the low noise performance evaluation system of tires.In order to enhance the investigation and development efficiency of our country tire industry and quality grade that provide technical support. |
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