我们要求这个，方程的时间导数。
And so we're going to take the derivative versus time of this equation.
我会计算时间导数。
方程中含有强迫场的一阶时间导数项。
Some first order time derivative terms are contained in the equations.
以前算过-,这是能量守恒，为了算出,简谐振荡的周期，我们求时间导数。
We've done this before-- this is the conservation of energy, and in order to find the period of the simple harmonic oscillation, we take the time derivative.
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。
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.
它就是位置，对时间的一阶导数。
速度向量，是位置向量关于时间的导数。
So, the velocity vector is the derivative of a position vector with respect to time.
主要讨论了测量参数间的时间延迟对飞机气动导数辨识结果的影响。
This paper briefly discusses the effects on the aerodynamic derivative identification results caused by time delay in measured parameters.
在控制方程的推导中，采用物质导数黏弹性本构关系取代通常采用的只对时间取偏导数的黏弹性本构关系。
The governing equation was derived making use of the viscoelastic constitution relation in which, besides the time derivatives, the material derivatives was also taken into account.
在此方程中，弥散项和对时间的导数为分数阶导数所代替。
In this equation, the diffusion is a fractional order derivative of time and space.
该方法将主惯导数据测量延迟时间扩展为卡尔曼滤波器的一个状态变量，并同时考虑了测量延迟时间对速度和姿态测量量的影响。
The method augments the measurement delay as a state of conventional Kalman filter as a state, and impacts on both velocity and attitude measurements owing to the time delay are also considered.
引入样条参数及其对时间的导数作为状态变量，导出状态方程。
The spline parameters and their derivatives are taken as state variables, the state equation is established.
文中还推导了多机系统下tef对时间的导数的一般公式，并以单机无穷大系统为例，图示说明了所设计的TCSC稳定控制策略的效果。
The general formula of TEF's derivative for multi machine system is deduced, and taking single machine infinitive bus system as example, the effect of the designeds...
采用自由振荡法数值模拟了平头、钝头外形的超声速俯仰振荡时间历程，并应用奇异分解线性最小二乘法辨识稳定性导数，得到动导数随马赫数和攻角非线性变化的规律。
The dynamic derivatives conception is used as the index for the vehicle stability, but it is looked as the function of angle of attack and Mach number to induced nonlinear characteristics.
采用自由振荡法数值模拟了平头、钝头外形的超声速俯仰振荡时间历程，并应用奇异分解线性最小二乘法辨识稳定性导数，得到动导数随马赫数和攻角非线性变化的规律。
The dynamic derivatives conception is used as the index for the vehicle stability, but it is looked as the function of angle of attack and Mach number to induced nonlinear characteristics.
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