Evolution Study of the Phase and Group Velocities by Choi-Williams and Born-Jordan Time-Frequency Representations

被引：0

作者：

Elhanaoui, Abdelkader ^{[1
]}

Aassif, Elhoucein ^{[1
]}

Maze, Gerard ^{[2
]}

机构：

[1] Ibn Zohr Univ, LMTI, Metrol & Informat Proc Lab, BP 8106, Agadir, Morocco

[2] LOMC, FRE CNRS, Waves & Complex Lab, F-7660 Le Havre, France

来源：

2012 INTERNATIONAL CONFERENCE ON MULTIMEDIA COMPUTING AND SYSTEMS (ICMCS) | 2012年

关键词：

Thin tubes; acoustic signals; group velocity; phase velocity; time-frequency representations; Choi-Williams; Born-Jordan;

D O I：

暂无

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

The pro pagation characteristics of circumferential waves around a thin aluminum tube filled by air and immersed in water, are investigated theoretically and experimentally. In particular, the experimental study focuses on the determination of the dispersion velocity. Choi-Williams and Born-Jordan representations are used to produce a good resolution in time and frequency domains and extract group velocities from arrival times of circumferential waves. On some time-frequency images, the symmetric (S-0) and antisymmetric (A(1)) circumferential waves propagating around tube are observed. In comparison with the results from the theory and experiment, it is confirmed that the measured group velocities agree well with that computed by the theoretical method of proper modes.

引用

页码：146 / 151

页数：6

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