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New Systems for Measuring Impact Vibration on Floor Decking Sheets
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1  Dpto. Tecnologia de la Edificacion (U.P.M.), Madrid, Spain

Abstract: Currently there is a restricted range of specific materials that are used as reducing impacts vibration on the building slab. The materials used in construction as resilient material, must meet very low elasticity modulus values. While the value of soft rubber is on the order of 4 GPa, the value of steel is 160 GPa (40 times greater). These low values ​​make differences of just 2 GPa (imperceptible in steel), produce very important variations in acoustic insulation gain. To determine the values of the elasticity modulus of the material used, test is required. The execution of the test is a difficult task and therefore expensive. First you need to prepare a slab reference, which must be tested independently. Subsequently, it has to place the floating slab, and re-testing. With the difference of the measurements the modulus of elasticity are determined. This work presents an alternative system that is simpler and cheaper. This system shall include a device to hit that is capable of creating a hit in all the trials and a capacitive sensor that is able to determine, once produced the hit, the energy absorbed by the plate. Once produced the impact, the plate suffer a deformation absorbing partly of the energy. The energy that has not absorbed by the plate is transmitted to the slab, and therefore the one heard in the adjoining enclosure as an impact noise or vibration. The plate absorbs the energy through its own deformation. Measuring the deformation with the sensor, the absorbed energy is obtained. After the execution of the test with the new device, proceed to the completion of a standard sound absorption  and vibration in situ test, according to the UNE-EN 140-7. By this way the sound insulation value and vibration is obtained, using a standard test to characterize the material. With the completion of testing on different geometric configurations of plates, we can establish a correlation between the values ​​obtained by the proposed alternative test in this research, and the results of a standardized test.
Keywords: Vibration, capacitive sensor, elasticity modulus