| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系碩博士班 === 90 === The purpose of the present paper is to investigate the geo-sound generated by the debris flows experimentally. The study try to identify the geo-sound of different rock material, so we simplified the source of the ground vibration from the friction and collision motions. The sound signals were analyzed by both the Fast Fourier Transform(FFT) and the Gabor transform. The experimental results show that there is no superior differences in frequency domain generated by the two motions besides the magnitude. Because friction maybe can be saw into several small collision motion basically. Approximately, we can divided the frequency into three domain by its` peak magnitude, it lies 10-100 Hz, 120-300Hz, and 400-800Hz. Otherwise, the geo-sound has deviation and it may make the identification harder. So the present paper use statistical method and trapezoidnal characteristic curve of fuzzy theory to identify the similarity of the geo-sound generated by different rock material. The identified results indicate that all the geo-sound are correctly identified and that the results are uneasily influences by individual bios.
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