逼近速度 meaning in English

rate of approach
rate of closure

A space navigator wishes to determine his velocity of approach as he nears the moon .
一个宇宙飞行员希望确定出他接近月球时的逼近速度。
On the rate of convergence of functions and their derivatives by beta operators
算子的导数对一类函数的逼近速度
In addition , the realization of whole neural network predictive control system and the control results are given
给出了改进elman神经网络模型的逼近速度和精度，比较了两种控制方法的控制效果。
Secondly , analysed the approach model , described circular arc approximation method , approaching blade curved surface with this method and realized raise of the approach speed
其次，分析了逼近模型，推导了单圆弧逼近方法，用这一方法来逼近叶片曲面，提高了逼近速度。