| With the rapid development of the automobile industry in the modern society, the automobile tire technology has been continuously improved, and its physical properties and mechanical properties have been improved. In order to get the deformation characteristics and vibration characteristics of the tire, it is necessary to do the experiments and finite element analysis.Through the hammer hit experimental tire this paper mainly research modal damping, modal frequencies and modal shapes, again by the finite element simulation different tire size of each order frequency and vibration type were compared to analyze and summarize the rules. By hammer method test and analysis the first six order modal shape deformation of the tire, FRF curves of average value and vibration frequency is corresponding to the average value, low order frequency of FRF curve fitting effect is well, but high order fitting did not agree, so the same overall trend of FRF fitting can approximately reflect the actual tire vibration. By the finite element analysis, the modal shapes of the original dimension and the size of the tire are analyzed, and the influence of the dimension on the modal deformation and natural frequency of the tire is obtained. By the research and analysis, FRF curves of average value and vibration frequency is corresponding to the average value, low order frequency of FRF curve fitting effect is well, but high order fitting did not agree, the same overall trend indicated that the FRF fitting can approximately reflect the actual tire vibration. By means of reducing the size of the tire various modal analysis, the first twelve modes of the deformation of the wheel hub through the expansion and contraction of the symmetric deformation, the deformation of the tire deformed from the overall increase into symmetrical deformation. From the thirteenth order mode to the eighteenth mode, the wheel hub deformed in a state of global contraction, and the degree of deformation is small.
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