approximation error

Under the thermohaline circulation condition by heating, the computed latitudinally and longitudinally vertical circulations are falsely strengthened due to Boussinesq approximation although this error is only about 1%;

在只有加热引起的热盐环流过程中，当模式作了Boussinesq假设以后，计算的经向和纬向垂直环流都会产生虚假的加强，虽然这种误差只是在1%左右；

The L2 norm and energy norm error estimates are derived for the backward Euler scheme in time variable and the mortar element approximation in the space variables.

对时间变量采用向后Euler格式，对空间变量采用mortar元近似。得到L2模及能量模误差估计。

Current Topics of Research II : Approximation Error and Approximation Theory.

当前主题研究 II: 近似值误差与近似值理论.

The frequency-domain MOR approaches have been fully developed, but we are more interested in the time domain response of the circuits for the frequency domain approximation error can be magnified greatly by the frequency-time conversion.

频域模型降阶方法的研究已较为成熟，但对电路而言，更关注的是其时域行为。频域逼近的误差转换到时域会放大，时域逼近精度无法保证。

On this basis, the related theory of free curve is introduced and the approximate algorithm of free curve by using straight line is proposed, and the approximation error is analyzed.

在此基础上，介绍了自由曲线的相关理论，提出了利用直线及圆弧来生成自由曲线轨迹的算法，并对误差进行了分析。

The indexes for approximation evaluation include the step response, the rising time, Bode plot, the band width, and the H-inf norm of the error over the whole frequency range.

比较指标有单位阶跃响应的上升时间、频域波特图的频率带宽、以及传递函数误差的H-inf范数。