EXPERIMENTAL STUDY FOR THE VERIFICATION OF A PREDICTION OF FLOOR-IMPACT SOUND LEVEL BY THE IMPEDANCE METHOD

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  • インピーダンス法による床衝撃音レベル予測手法検証のための実験的研究
  • インピーダンスホウ ニ ヨル ユカ ショウゲキオン レベル ヨソク シュホウ

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Abstract

This thesis describes the examination of experiments we have performed, on real buildings, on the subject we have been suggesting, namely, a method for computing the vibration-velocity response level of an entire floor slab, which plays a very important role in the practical calculation of floor-impact sound, by the impedance method. The tests were also carried out for a dynamic-characteristic correction value for a sound-level meter, which is derived from the final correction carried out to indicate the prediction in a form which can comply with the requirements of the Japanese Industrial Standard (JIS). As a result of the experiments, the calculation of average impedance of a floor slab against each impact point has been proved a practically accurate means. This method corrects the standardized impedance characteristics at the center of a slab as an increasing amount of impulsive impedance to which the effects of slab peripheral fixings are applied. Also considered correct is a method for computing the integral value of vibrational energy of an entire floor slab by obtaining the vibration-velocity response level from average impedance of the floor slab and multiplying it by the effective radiation area of the floor slab. It has been clarified that the dynamic characteristic correction value obtained by generating pulses corresponding the impulsive-force characteristics of a heavy impact source in an anechoic room, have been close to correct.

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