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• Main Authors: Chung-Han Hsieh, 謝忠翰
• Other Authors: Hsien-Ter Chou
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/75577915590954043299

碩士 === 國立中央大學 === 土木工程研究所 === 98 === The motion-induced acoustic signals for different granular particles are experimentally measured in this study. The variation of sound pressures and the corresponding peak frequencies under different forcings are analyzed. Two groups of test are adopted for the granular materials such as the glass bead, the polypropylene bead, the mill stone and the frog sand. The glass beads generate largest impacting sound pressure, the polypropylene beads in between, and the sound pressure for the mill stones is smallest. The sound pressure increases with particle size for the same material. The sound pressure for frog sand exhibits a peak value at the acceleration of 1.25G.