波動現象を利用した材料特性の同定 : 吸音材、制振鋼板、ロープ張力、消波構造物への適用(OS-4 基調講演)

概要

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One-dimensional wave equations are studied to identify material characteristics. Firstly, sound absorbing materials are discussed. A method was presented to determine complex sound propagation speed and complex effective density of the material, experimentally using two-microphone technique. Then, three-dimensional sound field involving sound absorbing materials was tested using boundary element method. Secondly, wave dissipative offshore structure was discussed. A similar method was presented to determine complex wave number of that structure. Thirdly, bending wave of cable structures was discussed. A new method to determine both tension and flexural rigidity of the bridge cable was presented and utilized for real bridge election. Finally, three-layered vibration damping steel sheets are discussed. Equivalent flexural rigidity of the sheet are effective to model shell structure. Unknown material characteristics, which sometimes appears as coefficient of derivative equations may be determined using one-dimensional experimentation. Substituting the material characteristics, three-dimensional real problem can be solved using numerical methods.
一般社団法人日本機械学会の論文
2000-03-16