In the unwinding process the dynamicradius of the paper roll is important for deciding the periods to replace the paper roll and controlling the tension of the paper.
放卷过程中，纸卷的动态半径与时间之间的函数关系对确定纸卷的更换周期和纸的张紧力控制具有重要意义。
2
Three methods to calculate the dynamicradius of the paper roll are presented in this paper,. Although they arise from different principles, their final results are the same.
在此从三种不同的原理出发，对纸卷的动态半径进行了计算，最终得到相同的结果。
3
Dynamic changing the scale of geoid undulations and the radius of the earth, the video mode of the earth figure is improved.