second time derivative

基本解释

This method measures the second derivative of the load current in real time to judge if there is a sudden change in the load current.
实时检测负载电流的二阶导数，判断负载电流是否发生突变。发生突变则采用预测控制程序模块进行补偿电流控制。
And this, you will recognize is the first derivative of velocity versus time which is also the second derivative of position versus time.
这点想必诸位已经了然于胸,它就是速度对,时间的一阶导数,也是位置对,时间的二阶导。
Moreover, due to the dynamic equations of LPMs with second-order derivative terms in time, the resulting structure-foundation-soil system can be solved by an explicit time-integration method.
此外，由于模型的动力方程具有二阶时间导数项，因而应用本文模型的结构–基础–土系统可以采用显式时间积分求解。