second time derivative

基本解釋

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(shí)時(shí)檢測負(fù)載電流的二階導(dǎo)數(shù)，判斷負(fù)載電流是否發(fā)生突變。發(fā)生突變則采用預(yù)測控制程序模塊進(jìn)行補(bǔ)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(diǎn)想必諸位已經(jīng)了然于胸,它就是速度對,時(shí)間的一階導(dǎo)數(shù),也是位置對,時(shí)間的二階導(dǎo)。
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，由于模型的動(dòng)力方程具有二階時(shí)間導(dǎo)數(shù)項(xiàng)，因而應(yīng)用本文模型的結(jié)構(gòu)–基礎(chǔ)–土系統(tǒng)可以采用顯式時(shí)間積分求解。