包絡線検波回路を用いた構造減衰係数の簡易測定

抄録

Methods for reducing the effect of the measurement error caused by beat and swinging of the sample were examined. The effect was problem when the small-damping sample was measured by previous system developed in this study. The beat was able to eliminate by using the rectangular solid shaped sample. And original damped wave for vibration of the sample was able to extract by using envelope detection circuit and filter circuit that remove the frequency component of the swell caused by swinging of the sample. As the result of measuring experiment using some known damped wave and metal samples, it was confirmed that the method was validated for measuring structural damping coefficients of the small-damping sample.