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。
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。
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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