To simply and surely determine a marked specific vibration mode from among various vibration modes with respect to an axisymmetrical structure.
In this vibration mode determination method, a mode stimulus coefficient is calculated from the result of a calculation in tire characteristic frequency analysis (step S201). Then, the found stimulus coefficient is set as a mode index used for determining a vibration mode (step S202). The mode index is compared with a previously determined prescribed threshold Ms (step S203). If the mode index is not less than Ms, the vibration mode is determined to be a vibration mode to be marked in tire evaluation (step S204). If the mode index is less than Ms, the vibration mode is determined to be a vibration mode other than the vibration mode to be marked in tire evaluation (step S206).
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久保光徳 他,”周期的に弾性支持された回転するリングの移動荷重による強制振動について”,第32回構造強度に関する講演会講演集,1990年 2月 7日,212~215頁