大多数发动机运转为四行程循环。
在四行程循环时，每凸轮必须旋转打开一阀门。
Each CAM must revolve once during the four-stroke cycle to open a valve.
通过操作面板选择，不仅可实现定程、定压两种成形工艺，而且可实现有垫、无垫、顶出三种工艺工作循环。
Through the operation panel, not only can realize the fixed distance and constant pressure of two kinds of forming process, and can realize a pad, pad free, top three cycle process.
此外由不同循环应力比下孔压时程曲线确定出临界循环应力比。
Furthermore, the critical cyclic stress ratio is determined according to the time history curves of pore water pressure under different cyclic stress ratios.
此外由不同循环应力比下孔压时程曲线确定出临界循环应力比。
Furthermore, the critical cyclic stress ratio is determined according to the time history curves of pore water pressure under different cyclic stress ratios.
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