下偏差 meaning in Chinese

lower deviation
lower dviation
lower variation of tolerance

Allowance below nominal size
尺寸下偏差
It is the first time to define the tolerance with upper deviation smaller than lower deviation as virtual tolerance which is given in this paper as well
摘要把上偏差小于下偏差的公差定义为虚公差，探讨了虚公差存在的理论基础及其意义，从而丰富了公差的内涵而发展为广义公差，更适合计算机辅助公差设计。
The improvements in the iaga contained adding strengthen operator , improving evaluation index of premature , etc . multi - phase homing project , making use of the flight properties of parafoil system in gliding and turning , was simple in control and facile in practice . based on frenet frame , the linear time - variable error equations of parafoil system were built
基于frenet坐标系推导和建立了翼伞系统线性时不变的误差方程,并运用“投影点”的思想来获得frenet坐标系下偏差量的解析近似表达式,从而设计了用于翼伞系统航迹跟踪的传统pd控制器和增益调节型模糊pd控制器。