The cycle frequency of jet fluid swing is half of that of tangential circle rotation.
相应切圆呈周期性旋转，射流摆动也具有周期性，该周期是切圆旋转周期的一半。
End cover structure of the APS and 400 spring series is suitable for most of the rotation and swing seal.
端盖式结构的APS和400弹簧系列适用于大部分的旋转和摆动密封。
MAIN OUTCOME MEASURES: the results of the sine swing test and the rotation sudden pause test.
主要观察指标：骤停旋转试验及正弦摆动试验结果。
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