A clothoid curve is used with its fine feature for the shape of transition section between spherical head and cylindrical shell of pressure vessel.

利用回旋曲线的优良特性，将其做为压力容器部分半球形封头与圆柱筒体之间的过渡曲线，实现了在连接边缘上无附加边缘应力的光滑连接。

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The parameter equation and the formula of each element of the curve are set up and compared with that of clothoid.

文中导出了五次代数式缓和曲线的参数方程和曲线各元素的公式；

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