A FRACTAL RECONSTRUCTION METHOD FOR LDV SPECTRAL-ANALYSIS

被引：17

作者：

CHAO, YC

LEU, JH

机构：

[1] Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan

来源：

EXPERIMENTS IN FLUIDS | 1992年 / 13卷 / 2-3期

关键词：

D O I：

10.1007/BF00218154

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

An unequally spaced fractal interpolation method is developed to reconstruct the low data rate laser Doppler velocimetry (LDV) signal for better spectral results. The reconstructed result not only augments the data points to improve the statistics but also retains the turbulent fractal dimension of the flow. In other words, the interpolated data are flow turbulence-correlated data which are physically reasonable. This method is demonstrated on the LDV spectral measurements in the shear layer of a jet flow and the results are compared against the hot-wire spectral data. When the data rate of the LDV signal is low, the fractal interpolation method can suitably restore the major spectral peaks while the conventional sample-and-hold fails. Effects of the data rate, data record length, sample rate and the fractal dimension on the accuracy of the spectral reconstruction are also discussed.

引用

页码：91 / 97

页数：7

共 14 条

[1]

ADRIAN RJ, 1987, EXP FLUIDS, V5, P17, DOI DOI 10.1007/BF00272419

[2]

Barnesly M. F, 1988, FRACTAL EVERYWHERE, VSecond

[3] MEASUREMENT OF TURBULENCE WITH THE LASER-DOPPLER ANEMOMETER [J].