The strength calculation formula of the screw propeller under the action of centrifugal force was obtained through multivariate fitting.

经多变量拟合，得到了离心力作用下螺旋推进器的强度计算公式。

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The NURBS curve is used for fitting the screw profile when cloud datas pretreatment is already done such as eliminated noise data and data reduction, the fitting error is also analyzed.

通过对测量数据的噪声点过滤，数据精简等预处理，采用NURBS曲线拟合螺杆型线并分析了其拟合误差。

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An improved method of stress analysis about bolt screw with interference fitting is provided as the first step of fatigue life-prediction for the joint.

针对过盈螺纹的疲劳寿命估算进行了工作，求解应力是寿命估算的第一步。

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