中央を加振される制振はりにおける反共振の有効質量の解析に基づく損失係数と振動伝達率の計算式

概要

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"Mechanical Impedance Method" is a measuring method of the loss factor of damped beam specimens widely adopted for practical use. In this method, an impedance head driven by a shaker is attached in the center of a beam. When the loss factor is evaluated for the anti-resonance, this method is considered to be a kind of double cantilever beam measurement. In order to confirm this, the equation for an Euler beam driven at the center is expanded with a linear combination of the natural modes of a double cantilever beam and the translational displacement. Thus, the equivalent mass of the natural modes is obtained. A frequency responce of mechanical impedance calculated using this equivalent mass is shown to be almost complete fitting with that calculated using free-free beam natural-modes. As one of remarkable applications of the modal expansion, an expression only using measurement in the center for estimating vibration transmissibility from the center to the tip is derived.
一般社団法人日本機械学会の論文
2001-07-25