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Low frequency measurements of impact sound performance in light weight timber frame office buildings
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggande och boende (TRb).ORCID iD: 0000-0002-0019-4568
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.ORCID iD: 0009-0001-6514-1950
2012 (English)In: Proceedings of EURONOISE 2012, European Acoustics Association , 2012, , p. 6p. 191-196Conference paper, Published paper (Refereed)
Abstract [en]

There is little data available of low frequency impact sound response of light weight wooden buildings. The ISO 140-7, 717-2 standards normally used of impact sound is limited down to 50 Hz. The response in low frequency area is of interest for human comfort. In the present work low-frequency impact sound measurements were carried out in two modern office buildings with lightweight timber frame. The purpose was to assess the levels of impact sound transmission below 50 Hz in these construction types. The low frequency impact sound levels are compared to the higher. Both the tapping machine and the impact ball are used for excitation. It is seen that the present constructions have their highest levels below or close to 50 Hz when excited by the impact ball. From the office rooms sharing joist floor with corridor there is seen increased levels of low frequency impact sound. Up to 10-15 dB higher impact sound was detected compared to room with joist floor separated from corridor.

Place, publisher, year, edition, pages
European Acoustics Association , 2012. , p. 6p. 191-196
Keywords [en]
Human comforts, Impact sound, Light weight, Low frequency, Low frequency measurements, Tapping machine, Timber frames
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-12195Scopus ID: 2-s2.0-84865995824Local ID: 14424ISBN: 9788001050132 (print)OAI: oai:DiVA.org:ri-12195DiVA, id: diva2:970017
Conference
EURONOISE 2012
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2024-03-18Bibliographically approved
In thesis
1. Low Frequency Impact Sound in Timber Buildings: Simulations and Measurements
Open this publication in new window or tab >>Low Frequency Impact Sound in Timber Buildings: Simulations and Measurements
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

An increased share of construction with timber is one possible way of achieving more sustainable and energy-efficient life cycles of buildings. The main reason is that wood is a renewable material and buildings require a large amount of resources. Timber buildings taller than two storeys were prohibited in Europe until the 1990s due to fire regulations. In 1994, this prohibition was removed in Sweden.

    Some of the early multi-storey timber buildings were associated with more complaints due to impact sound than concrete buildings with the same measured impact sound class rating. Research in later years has shown that the frequency range used for rating has not been sufficiently low in order to include all the sound characteristics that are important for subjective perception of impact sound in light weight timber buildings. The AkuLite project showed that the frequency range has to be extended down to 20 Hz in order to give a good quality of the rating. This low frequency range of interest requires a need for knowledge of the sound field distribution, how to best measure the sound, how to predict the sound transmission levels and how to correlate numerical predictions with measurements.

    Here, the goal is to improve the knowledge and methodology concerning measurements and predictions of low frequency impact sound in light weight timber buildings. Impact sound fields are determined by grid measurements in rooms within timber buildings with different designs of their joist floors. The measurements are used to increase the understanding of impact sound and to benchmark different field measurement methods. By estimating transfer functions, from impact forces to vibrations and then sound pressures in receiving rooms, from vibrational test data, improved possibilities to correlate the experimental results to numerical simulations are achieved. A number of excitation devices are compared experimentally to evaluate different characteristics of the test data achieved. Further, comparisons between a timber based hybrid joist floor and a modern concrete floor are made using FE-models to evaluate how stiffness and surface mass parameters affect the impact sound transfer and the radiation.

    The measurements of sound fields show that light weight timber floors in small rooms tend to have their highest sound levels in the low frequency region, where the modes are well separated, and that the highest levels even can occur below the frequency of the first room mode of the air. In rooms with excitation from the floor above, the highest levels tend to occur at the floor levels and in the floor corners, if the excitation is made in the middle of the room above. Due to nonlinearities, the excitation levels may affect the transfer function in low frequencies which was shown in an experimental study. Surface mass and bending stiffness of floor systems are shown, by simulations, to be important for the amount of sound radiated.

    By applying a transfer function methodology, measuring the excitation forces as well as the responses, improvements of correlation analyses between measurements and simulations can be achieved.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Dissertations, 2016. p. 100
Keywords
Impact sound, Stegljud
National Category
Other Civil Engineering Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:ri:diva-36986 (URN)978-91-88357-46-5 (ISBN)
Presentation
2016-11-30, Sal Tegnér,, Hus H, Linnéuniversitet, Växjö, 10:00 (English)
Opponent
Supervisors
Projects
ProWoodSilent Timber BuildUrban TranquilityBioInnovation FBBB
Available from: 2019-07-02 Created: 2019-01-07 Last updated: 2019-07-02Bibliographically approved

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Olsson, JörgenJarnerö, Kirsi

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