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To test standing wave of the tire, constructed the simulation model by ABAQUS software for radial tire running rapidly on the automotive chassis dynamometers, meanwhile assembled the automotive chassis dynamometers, high-speed camera and actual radial tire together. The experiment indicated that the critical speed of simulation tire is 255.83 km/h, actual tire 268.5 km/h, the difference is 4.95%, Consistency is very good for simulation result and actual tire testing. When the vehicle is running rapidly to the special speed, the tire will bring standing wave, while distortion of the tire largen , the temperature rise rapidly, material performance decline quickly, the tire will be destroyed at short notice. Now the method of critical speed research of the tire included analytical method, experimentation and finite element simulation, the analytical method is that constructed theory model of the tire (1) , for example Sakai Hideo researched critical speed of radial tire on the equation of girder vibration by loop girder model of elasticity radicle (2) . The experimentation method was that high speed photograph shot distortion picture of mini diameter tire model in the different speed by flywheel driving during standing wave (3) . The method of finite element simulation was that the tire model was constructed by software of finite element analysis, accordingly researched critical speed and its effect factor of the tire model (4-7) . These methods were advantages and disadvantages, the analytical method was more comprehensive but not enough precision. The experimentation method was enough precision but higher cost and more dangerous. The simulation method was more comprehensive but not enough precision. Radial tire modeled We research radial tire(Bridgestone 195/60 R15) , constructed finite simulation model of tire by ABAQUS software, made the tire to run rapidly on the automotive chassis dynamometers. We constructed rotational symmetry model of the tire on ignoring flower pattern, defending line and sign line because of very complex structure of the tire, thus analysed the tire load and twirl. For the tire and wheel rim, the joint was predigested fixed restriction of relevant area of bead of tire. Simulation parameter setup. We established interaction, selected main surface and secondary surface between each surface(selected rolling drum as main surface because we need set it as rigid body, main surface red, secondary surface pink). Then we continued to found attribute of touch action, selected tangential force from mechanics of attribute of touch action, friction formula as roughness. We established attribute of joint section radial pressure, eddy, else default(fig. 1).

Research of the Principle of Standing Wave and Critical Speed Determination for the Radial Tire