114 モードパラメータの修整に基づく近似的な音響放射パワーの推定手法(サイレント工学I:放射音響の推定)(OS.04 : サイレント工学)

概要

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An approximation method to estimate the change of sound radiation power due to modification of structure is described. The equivalent material properties are firstly derived assuming that the modified part is isotropic ; then the obtained material properties are converted to the values reducing the modified part into the original shape and sizes, namely the material properties of an equivalent simple plate. The mass and stiffness matrices are calculated using these obtained material properties and then the change of those matrices after modification are then calculated by subtracting the original mass and stiffness matrices. The change of sound radiation power after modification is estimated using the change of modal parameters which can be calculated using the obtained mass and stiffness matrices. This procedure was applied to a simple rectangular plate and a rectangular plate adhesived with a rectangular strip, and were examined comparing with the experimental values. As the result, the batural anglar frequencies and mode shapes which were calculated using the material properties of the equivalent simple rectangular plate were almost the same as the values of the rectangular plate with a rectangular strip ; but the change of sound radiation power after adhesiving the rectanglar strip didn't conincide the experrimental values.
一般社団法人日本機械学会の論文
2001-08-03