An improved mixed-radix FFT technique and its application in frequency spectral analysis
Numerical analysis methods in time-domain and frequency-domain are commonly considers as two important ways for seismic evaluation of structure responses.FFT plays a unique role in building the equivalent expression between the structural dynamic signals in time domain and frequency domain, such as computing frequency spectrum values at discrete frequency points for time history data.On the basis of radix-4 and radix-2 FFT techniques, an improved district fast Fourier transfer FFT is presented in this paper to improve the transform efficiency, in which radix-4 transform is applied in most iterative steps, besides radix-2 transform used in the last one iterative step.As compared to the traditional radix-2 FFT, the new mixed-radix FFT leads to distinct reducing in computing amount, while the equivalent precision and the same discrete frequency points remain.Also by taking the trigonometric coefficient method as theoretical results, its numerically validated through some examples that the new improved FFT transform technique suits the engineering application of the fast numerical transform in the time and frequency domain for structural frequency spectral analysis.
Dynamic response Numerical analysis Frequency spectral analysis FFT
Jian-bo Li Ji-dong Wang Bing Fu Gao Lin
Institute of Earthquake Engineering,Dalian Univ.of Technology,Dalian 116024
国际会议
上海
英文
560-567
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）