It is considered that this phenomenon is caused by difference of saddle surface speed between two pulleys.

环拉力在带的各边不同，这种现象由于两带轮间支承面速度不同造成的。

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The forming forces for three typical shapes, i. e. cylindrical, spherical, and saddle surface of different materials with different thickness were simulated.

对不同材料、不同厚度的圆柱面、球面及马鞍面三种典型形状的成形力进行了数值模拟，分析了成形力的变化过程及影响因素。

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A saddle surface was measured by the grating non-contact method and the experiments indicated that the method had a feature of speed, precision, and operability.

采用光栅非接触测量方法对马鞍型曲面测量，结果表明，该方法速度快、精度高、可操作性强。

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