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Force to sound pressure frequency response measurements using a modified tapping machine on timber floor structures
RISE - Research Institutes of Sweden, Built Environment, Building Technology.ORCID iD: 0000-0002-0019-4568
RISE - Research Institutes of Sweden, Built Environment, Building Technology.
2019 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 196, article id 109343Article in journal (Refereed) Published
Abstract [en]

In recent years, research has shown that the lower frequency portion of impact sound, down to 20 Hz, is of significant importance to residents’ perception in buildings that have lightweight timber floors. At low frequencies, the finite element method is a useful tool for predictive analysis. Impact sound frequency response functions, which are easily calculated using finite element software, are useful as they offer a common ground for studies of correlations between measurements and analyzes. On the measurement side, the tapping machine is well defined and has become the standard excitation device for building acoustics. When using a tapping machine, the excitation force spectrum generated – necessary to achieving experimental frequency force to sound response functions – is unknown. Different equipment may be used for excitation and force measurements and if a structure behaves linearly, the use of any excitation devices should result in the same frequency response functions. Here, an ISO tapping machine hammer is fitted with an accelerometer, enabling estimates of input force spectra. In combination with measurements of the sound in the receiver room, frequency response functions are then achieved using an ISO tapping machine. Various excitation devices have been used on a floor partition in a timber building and on a cross-laminated timber (CLT) lab. floor in order to compare the resulting frequency response functions. Structural nonlinearities are evident, implying that for accurate frequency response measurements in acoustically low frequencies, excitation magnitudes and characteristics that are similar to these which stem from human excitations, should preferably be used.

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. Vol. 196, article id 109343
Keywords [en]
Frequency response functions, Impact sound, Low-frequency, Measurements, Timber buildings, vibrations, Acoustic waves, Architectural acoustics, Finite element method, Floors, Measurement, Timber, Wooden buildings, Wooden floors, Frequency response
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39426DOI: 10.1016/j.engstruct.2019.109343Scopus ID: 2-s2.0-85068054473OAI: oai:DiVA.org:ri-39426DiVA, id: diva2:1335981
Note

Funding details: Energimyndigheten; Funding details: Svenska Forskningsrådet Formas; Funding details: VINNOVA; Funding text 1: We would like to express our gratitude to those that have supported the work. The CLT floors were borrowed from the JSP2 project funded by Akademiska Hus. The measurements of the CLT floors were made within the BioInnovationen project FBBB, financed by VINNOVA, the Swedish Energy Agency, the Swedish Research Council Formas and by the participating organizations. The analyzes here were made within the Intereg Öresund-Kattegat-Skagerak project, Urban Tranquility. The measurements of the M-building were conducted within the ProWOOD research education program, funded by the Swedish Knowledge Foundation, Linænus University and RISE Research Institutes of Sweden. Appendix A

Available from: 2019-07-08 Created: 2019-07-08 Last updated: 2019-07-08Bibliographically approved

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Olsson, Jörgen

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