Comparison of vibration transmission rate when using vibration control rubber and DIN 45669-2 method for countermeasures to contact resonances of vertical vibration

• Published in: Acoustical Science and Technology 2022/11/01, Vol.43(6), pp.316-321
• Main Authors: Tomita, Ryuta, Goto, Yuta, Adachi, Dai
• Format: Article
• Language: English
• Subjects: Accelerometer; Accelerometers; Carpet; Carpets; Contact resonance; DIN 45669-2; Floor coverings; Floors; Resonance; Rubber; Vibration; Vibration control; Vibration control rubber; Vibration measurement
• ISSN: 1346-3969; 1347-5177
• DOI: 10.1250/ast.43.316

When an accelerometer is placed on a soft floor covering such as a carpet, a resonance system is created by the spring of the carpet and the mass of the accelerometer, and vibrations are amplified at the resonance frequency. This is called "contact resonance." Therefore, to accurately measure the vibration of the floor structure underneath the carpet, it is generally necessary to first peel off the floor covering. Contact resonances on surfacing materials such as carpets and tatamis must be considered when measuring the vibration of buildings. The German standard is DIN 45669-2. In this report, we present a comparison of the method specified in DIN 45669-2 and a method using vibration control rubber proposed in this study. Measurement results showed that, when using the DIN 45669-2 method, there was almost no contact resonance effect for the thinnest carpet, but for other carpets, a contact resonance effect was observed. The values estimated by the method using the vibration transmission rate of vibration control rubber showed that the contact resonance effect can be reduced for the carpets examined in this study.