阶跃时间 meaning in English

snap time
stetime

In chapter five , on the basis of setting up a set of math models of four - dimensional pressure control system , and making use of copying tool - simulink supplied by matlab , the frequency and time field specific property has been analyzed , and several curves of frequency and time field specific property in the systemhas been obtained . as a result , some modelled conclusions have been acquired
第五章在建立四维井底压力控制系统数学模型的基础上，采用matlab提供的仿真工具? simulink ，对系统频域特性、时域特性进行了分析，并获得该系统的频域特性曲线、阶跃时间响应曲线等，最终给出仿真结论。