The study of Normal Modes dispersion extraction based on F-K transform

Abstract

At present, dispersion curves are usually extracted through temporal-spatial analysis methods. To obtain more dispersion information relating to waveguides, the F-K transform is introduced in this paper. Based on Normal Mode theory, the feasibility analysis of the F-K transform employed in dispersion extraction has been provided with deduction and numerical simulation at first. Then, an anechoic tank measurement based on scale model has been carried out so as to demonstrate the research mentioned above, while at the same time the validity of the scale model applied to sound propagation has also been proved by normal mode theory. As for the accuracy and efficiency of measurement, they are further verified by the agreement between the numerical simulation and the analysis results of the measured data.