665 1 次元波動方程式を利用した減衰特性などの測定方法(吸音材, 消波工, 制振鋼板, ロープ張力への適用)

概要

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One-dimensional wave equations are studied to identify vibration damping characteristics. Damping characteristics are generally expressed as coefficient of wave equations. So new formulations are derived analytically to express the coefficient using boundary condition of wave equations. Present formulations are applied to following four wave equations, i) sound propagation in sound absorbing material, ii) coastal wave propagation in wave energy dissipating structure, iii) flexural wave in three-layered vibration damping steel sheets, iv) bending wave of cable structures. Substituting measured or ideal boundary conditions into the formulation, coefficients of wave equations, such as complex propagation speed, complex bending rigidity, and tension, are calculated and compared with experimental results. Excellent agreements suggest that vibration damping characteristics can be identified by present formulations and one dimensional wave experimentation.
一般社団法人日本機械学会の論文
2000-09-01