A constraining facet is a construct that you can use to control the value space of simple type during derivation.
约束facet是一种构造，可以在派生期间使用它们控制简单类型的值空间。
2
The formula of reliability index is calculated in the origin space directly, so derivation and orthogonal transformation are avoided.
所用的可靠度计算公式直接在基本变量空间中求解，避免了繁琐的求偏导数和正交变换工作。
3
State equations the derivation of state space models is no different from that of transfer function in that the differential equations describing the system dynamics are written first.