提出采用可控减速法设计离心风机两元叶片，即通过三维黏性流场计算，采用正交试验设计方法，以确定流道内平均速度的减速规律和叶片型线。
In the present method, the orthogonal design and the three-dimensional viscous flow field computation were used to determine the optimum controlled deceleration flow in impellers and the blade curves.
方法首先讨论了对传统抗呼吸干扰的相干平均法改进，同时提出了估计拟合呼吸波和时域切比雪夫正交多项式消除呼吸干扰的方法。
Method The improvement of coherent averaging method of Reducing respiratory Interference was discussed, and evaluation-fitting respiratory wave and filter of Chebyshev's polynomial as presented.
在两步估计法中，利用正交变换得到了总平均的估计，然后采用拟合常数法得到了方差的估计，并证明了该估计是无偏估计。
In two-stage estimate, used orthogonal transformation to estimate aggregate average and fitting constants method to estimate variance which was unbiased.
在两步估计法中，利用正交变换得到了总平均的估计，然后采用拟合常数法得到了方差的估计，并证明了该估计是无偏估计。
In two-stage estimate, used orthogonal transformation to estimate aggregate average and fitting constants method to estimate variance which was unbiased.
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