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Measurements of low frequency impact sound transfer functions of light weight timber floors, utilizing the IsO rubber ball
RISE - Research Institutes of Sweden, Samhällsbyggnad, Byggteknik.ORCID-id: 0000-0002-0019-4568
Linnaeus University, Sweden.
2018 (Engelska)Ingår i: 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling, International Institute of Acoustics and Vibration, IIAV , 2018, s. 476-483Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Impact sound below 100 Hz is an important issue for light weight timber buildings. It is also well known that finite element model simulations are more beneficial in the low frequency range than in higher frequencies due to the longer wavelengths allowing the element meshes to be coarser. Utilizing transfer functions to describe impact sound would imply simplifications to correlate data stemming from measurements and low frequency finite element models. If the impact force is known, the simulations become easier since there would not be any need for the modelling of the impact mechanisms, just calculations of the transfer functions which are then combined with the force spectrum to give the resulting sound pressure. The impact ball has shown to be in close resemblance with a human's excitation in the low frequency range which makes it a suitable excitation device. However, when its force spectrum is needed, it may be hard in practice to achieve that during a regular measurement since the ball is not easily equipped with a force gauge. Here, two different methods are investigated. An investigation of the repeatability of the force spectrum of the rubber ball in the low frequency range for floors having different mobilities is made. To enable this, an equipment for field measurements of impact force spectrum and potentially point mobilities using an ISO ball, is designed, manufactured and evaluated. Impact force measurements are made on lightweight timber as well as concrete floors, with different properties for comparisons. Within the lowest frequencies it is potentially possible to use one given force spectrum from the ISO ball together with impact sound measurements for the creation of impact force to sound transfer functions on different floors.

Ort, förlag, år, upplaga, sidor
International Institute of Acoustics and Vibration, IIAV , 2018. s. 476-483
Nyckelord [en]
Ball, Impact sound, Low frequency, Acoustic waves, Architectural acoustics, Finite element method, Floors, Force measurement, Rubber, Timber, Wooden buildings, Excitation devices, Field measurement, Higher frequencies, Impact sound measurements, Low frequency range, Low-frequency, Transfer functions
Nationell ämneskategori
Samhällsbyggnadsteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-37272Scopus ID: 2-s2.0-85058680787ISBN: 9781510868458 (tryckt)OAI: oai:DiVA.org:ri-37272DiVA, id: diva2:1280120
Konferens
25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018, 8 July 2018 through 12 July 2018
Tillgänglig från: 2019-01-18 Skapad: 2019-01-18 Senast uppdaterad: 2020-01-22Bibliografiskt granskad

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Olsson, Jörgen

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