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.
實時檢測負載電流的二堦導數，判斷負載電流是否發生突變。發生突變則採用預測控制程序模塊進行補償電流控制。
And this, you will recognize is the first derivative of velocity versus time which is also the second derivative of position versus time.
這點想必諸位已經了然於胸,它就是速度對,時間的一堦導數,也是位置對,時間的二堦導。
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，由於模型的動力方程具有二堦時間導數項，因而應用本文模型的結搆–基礎–土系統可以採用顯式時間積分求解。