A method of using fast Fourier transformation (FFT) to calculate the frequency characteristics of discrete mathematical model is introduced.
介绍了利用快速富里叶变换(FFT)计算离散数学模型频率特性的方法。
With the help of the simple mathematical method, another transformation formula of coordinates and time between the radius vector equations in inertial frames is derived in the paper.
本文运用简单的数学方法推导出惯性系矢径方程的另一种坐标和时间变换式。
An efficient solution method for structural optimization is proposed by coordinated use of mathematical transformation, two level approximation concepts and dual theory.
利用包络函数、二级近似概念和对偶理论，提出了一种结构优化的有效解法。
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