This paper studies the vibration stability of rectangular shaft on variable rotation.

本文研究了扁平轴变速回转时的振动稳定性问题。

youdao

The tombs (98ldm2and2000ldm4) lie in the west of the graveyard at Yuandingshan. About20m from each other, both tombs have a vertical earthen shaft of a rectangular plan with rounded corners.

编号为98ldm2、2000ldm4的2座墓葬位圆顶山墓地西侧，两墓相距约20米，均为圆角长方形竖穴土坑墓。

youdao

In the aspect of cross-section, the shaft is generally designed in a circular shape in spite of the fact that the rectangular type has more versatile usage of space.

尽管方形有更多的使用空间，但在断面连接处，竖井一般被设计成圆形。

youdao