水力发电2012，Vol.38Issue(3)：21-23,3.
基于插值重采样的信号FFT分析方法研究
Research on Fast Fourier Transform Algorithm Based on Interpolation Re-sampling Method
摘要
Abstract
Regarding that the actual signal while its frequency spectrum is analyzed usually doesn't meet the demand of radix-2 Fast Fourier Transform (FFT) which is only worked for the sequence length that is an integral power of 2, the methods of prolonging the sampling time or padding zero to the signal so that it fits for the algorithm are adopted, but these methods aggravate sampling load and cause omission of frequency at the same time. An improved FFT algorithm based on the linear interpolation method is given and compared with the common one herein. The simulation results show that the improved algorithm can precisely get the frequency characteristics of the signal without adding workload. The application of improved algorithm on the actual analysis of hydroelectric set vibration signal also shows that the results are consistent with the real situation.关键词
FFT/频谱/插值重采样Key words
Fast Fourier Transform(FFT)/frequency spectrum/interpolation re-sampling分类
能源科技引用本文复制引用
王恒超,陈喜阳,何志锋..基于插值重采样的信号FFT分析方法研究[J].水力发电,2012,38(3):21-23,3.基金项目
中央高校基本科研业务费资助项目(0117120964) （0117120964）
华中科技大学自主创新基金资助项目 （）
