In order to realize a noise octave analysis by software, a digit weight method based on FFT is proposed.
为了利用软件实现噪声倍频程分析，提出了一种基于FFT的数字计权方法。
This paper introduces a method and the result by the use of the regression analysis method to establish helicopter group weight formulae.
本文介绍了利用回归分析法建立直升机部件重量公式的方法和结果，并用子样外的几种中、小型直升机作了校核验算。
On the basis of analysis of the factors effecting rail-sea intermodal transportation volumes, this article presents the improved production coefficient method calculated by value instead of by weight.
通过分析海铁联运运量的影响因素，提出基于集装箱货值的改进生成系数法来预测海运进出口集装箱内地生成量；
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