The determination of entrance angle of both R coining dies and conical coining dies and the approach to eliminating bell shapes during sizing have been outlined.
入口形状为圆弧的整形模其入口曲率半径R的选择和入口形状为锥度的整形模其入口角度的选择，以及精整中消除喇叭口的措施。
By finite element analysis of circular conical shell, the natural frequencies and vibrational modes of Yongle Bell have been calculated.
本文通过旋转壳体的有限元方法，计算了永乐大钟的主要固有频率和振型。
By finite element analysis of circular conical shell, the natural frequencies and vibrational modes of Yongle Bell have been calculated.
本文通过旋转壳体的有限元方法，计算了永乐大钟的主要固有频率和振型。
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