friction ratio meaning in English

滚筒速比
摩擦比

Single speed motor drive connected to a helical worm gear and a totally enclosed connecting gear box with heavy duty chain drive to the rolls and with fixed friction ratio according to customers request ( normally 1 : 1 , 2 )
系统带有同螺旋涡齿轮以及全封闭齿轮箱的单速马达，它带有重型链传动系统并可根据客户的需要固定摩擦比（通常为1 : 1 . 2 ）。
( 2 ) with f varying , there exists a number fr which is about - 1 ( curvature , torsion and dean number have little influence on fr ) , when f > fr , the maximum of the axial velocity is near the outside bent and the friction factor ratio increases with f increasing ; when f < fr , the maximum is near the inner side bent and the ratio increases with f decreasing ; when f = fr , the distributions of the axial velocity are similar to those of poiseuille flow and the friction ratio is about 1
( 2 )当f变化时，存在确定的数值fr ( fr在- 1左右。曲率、挠率和dean数对fr的影响很小) ，当f fr时，轴向速度最大值偏向外侧，摩擦系数比随f增大而增大；当f fr时，轴向速度最大值偏向内侧，摩擦系数比随f减小而增大；当f = fr时，轴向速度的分布和poiseuille流近似相同，摩擦系数比约为1 。