防振ゴムを利用したカーペット上での環境振動測定方法の提案

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  • PROPOSAL FOR ENVIRONMENTAL VIBRATION MEASUREMENT METHOD ON CARPET USING VIBRATION CONTROL RUBBER
  • ボウシン ゴム オ リヨウ シタ カーペット ジョウ デ ノ カンキョウ シンドウ ソクテイ ホウホウ ノ テイアン

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<p> To measure the environmental vibration inside buildings, a piezoelectric acceleration pickup combined with a vibration meter or a vibration level meter is often used. In all these cases, while installing the vibration pickup on the floor, it is necessary to pay attention to the mounted resonance. Inside a building, the mounted resonance occurs when a vibration pickup is placed on a soft flooring material such as a carpet, thus creating a vibration system through the spring of the flooring material and the mass of the vibration pickup, with amplified vibration at the resonance frequency. Therefore, when evaluating the vibration of the floor structure accurately, it is necessary to remove the flooring material for accurate measurements. A manual on environmental vibration measurement states, "When the floor is covered by a soft flooring material such as a carpet, remove the material to the extent possible and install (the vibration pickup) on the building frame".</p><p> In general, the vibration level meters are adapted to the measurement standards of JIS C 1550:1995 and JIS C 1517:2014; moreover, the vibration pickup of these meters can measure accurately from 1 Hz. However, their weight is relatively large at 320 to 335 g. From the viewpoint of mounted resonance, it is very difficult to prevent mounted resonance with these devices because the resonance frequency is low when compared to a piezoelectric-type acceleration pickup, which weighs approximately 20 g. Therefore, in this study, we conducted research on the vibration pickup of a vibration level meter.</p><p> In this study, in contrast to the conventional approach, we investigated a method that enables accurate measurement of the vibration acceleration of the floor structure under a carpet without removing the flooring material, which is a nondestructive inspection. This paper reports an outline of the measurement method, and though limited in scope, the experimentally verified results are presented. The range of frequencies covered by this study for the analysis of vertical vibration in a building includes the one-third octave band from 3.15 to 80 Hz.</p><p> The prediction technique proposed in this study was carried out by the following method for each frequency band.</p><p> ① Measure on the carpet, carpet + vibration control rubber carry out.</p><p> ② Calculate the relative acceleration level of ①.</p><p> ③ Focus on the resonance frequency of ②.</p><p> ④ In the frequency band lower than √2 times the resonance frequency, the result on the carpet is used.</p><p> ⑤ In the frequency band higher than √2 times the resonance frequency, a method of adding the correction value based on the vibration transmission rate of the vibration control rubber alone to the result of the vibration control rubber on the carpet was proposed.</p><p> As a result of the verification, it was possible to show very good correspondence with the actual measurement result of the concrete slab surface on which the carpet was peeled off.</p><p> In this study, we proposed a method to predict the vibration acceleration level of a concrete slab by means of a nondestructive inspection without removing the carpet. When a complaint arises, this method suggests the possibility of predicting the vibration acceleration level of a concrete slab with high precision on-site without removing the carpet, by measuring in advance the resonance characteristics of the vibration control rubber to be used.</p>

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