The Vibration of A Tire with Ground Contact using Finite Element Method

• Main Authors: Shuen-Ren Yu, 尤舜仁
• Other Authors: Mau-Pin Hsu
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/19783180759411845675

碩士 === 國立臺灣科技大學 === 機械工程系 === 88 === In this thesis, finite element method was used to analyze vibration behaviors of tires. Firstly, numerical results of circular ring and toroidal shell were compared with analytical solutions to make curtain the correctness of the numerical model. In the process, the characteristics of repeated modes of a circular ring was identified and explained in contrast with an elliptical ring. Next, a numerical model of a real tire was built and its natural frequencies and mode shapes in free-free status were generated. The effects of inflation pressure on the natural frequencies were studied. We found that frequencies of bending modes were increased with increasing pressure. However, this effect was not substantial for the extensional modes such as the breathing mode. Modes of the coupled rim and tire structure were classified and discussed. In addition to the well-known bending modes in circumferential direction, modes with rims moving as rigid bodies (translated axially and radially, as well as rotated about rim axis and one of its diameters) and a "saddle-shaped" mode were all examined. In the analysis, it is found that in some modes the mass of the rim would affect the whole structure''s natural frequencies if the rim is moving as a rigid body. However, the mass of the rim has little effect on those circumferentially bent modes. When the tire has ground contact, the natural frequencies of the symmetric bending modes were also affected by the rim mass. Not all the modes can be identified by using the same excitation position and same excitation direction. In order not to miss one single mode, one has to use different excitation points as well as different excitation directions and then combine all the frequency spectra to a complete one.