Low-frequency impact sound pressure fields in small rooms within lightweight timber buildings – suggestions for simplified measurement procedures

Olsson, Jörgen; Linderholt, Andreas

doi:10.3397/1/376628

Cited by 6 publications

(5 citation statements)

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“…The quantities, however, are still too high and far from satisfactory in multi-occupancy residential buildings. In addition, the positive values of term CI, observed for both models, prove that low frequency performance may pose a challenging problem [25][26][27]. Local improvement of sound insulation was observed at 250 Hz for both investigated floors, with and without the ceiling, for both airborne and impact sound insulation characteristics (Figure 7).…”

Section: Heavy Floating Floorsmentioning

confidence: 72%

“…The quantities, however, are still too high and far from satisfactory in multi-occupancy residential buildings. In addition, the positive values of term C I , observed for both models, prove that low frequency performance may pose a challenging problem [25][26][27]. Equally surprising is the fact that the significantly increased mass of the floor, resulting from the larger thickness of the upper slab in model 1d (60 mm), did not improve significantly the airborne sound insulation, compared to the considerably thinner screed used in model 1c (25 mm).…”

Section: Heavy Floating Floorsmentioning

confidence: 86%

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The Influence of Insulating Layers on the Acoustic Performance of Lightweight Frame Floors Intended for Use in Residential Buildings

Nowotny

Nurzyński

2020

Energies

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The acoustic performance of floors plays a primary role in the total quality rating of a residential building. The sound insulation of lightweight frame floors, which are increasingly being used in housing, depends on a number of factors and technical details. In effect, the sound transmission scheme is distinctly more complicated than in the case of homogeneous massive partitions. The aim of the study was to develop effective insulating layers of lightweight floors intended for use in residential buildings. The floor system should satisfy legal requirements in terms of airborne and impact sound insulation. The research was based on laboratory measurements taken in a standard test facility. Ten different models of wood and metal floors were considered. The acoustic performance of their basic structure was insufficient; however, the application of effective floating floors and suspended ceilings improved it greatly and succeeded in potential meeting requirements and satisfying most inhabitants’ expectations. The results demonstrate how different lightweight floor components influence the acoustic performance of the floor and how the insulating layers cooperate when applied together. The findings will be useful in working on a new floor design and optimizing its structure in terms of acoustics.

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Section: Heavy Floating Floorsmentioning

confidence: 72%

“…The quantities, however, are still too high and far from satisfactory in multi-occupancy residential buildings. In addition, the positive values of term C I , observed for both models, prove that low frequency performance may pose a challenging problem [25][26][27]. Equally surprising is the fact that the significantly increased mass of the floor, resulting from the larger thickness of the upper slab in model 1d (60 mm), did not improve significantly the airborne sound insulation, compared to the considerably thinner screed used in model 1c (25 mm).…”

Section: Heavy Floating Floorsmentioning

confidence: 86%

The Influence of Insulating Layers on the Acoustic Performance of Lightweight Frame Floors Intended for Use in Residential Buildings

Nowotny

Nurzyński

2020

Energies

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“…This may also explain some other unexpected results, such as that the thinner simple floor (Model S1) was slightly better in the low-frequency range than the reference floor (but worse in higher frequency ranges). In order to obtain better statistical results, a number of excitation points that are sufficient to archive a certain standard error of the average results, similar to a proposed measurement procedure, 17 should be used. It should also be noted that damping is a property that may be a source of deviation from reality in these types of simulations.…”

Section: Discussionmentioning

confidence: 99%

Low-frequency impact sound of timber floors: A finite element–based study of conceptual designs

Olsson

Linderholt

2020

Building Acoustics

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Traditionally, product development concerning acoustics in the building industry is measurement oriented. For lightweight floors, frequencies that are lower than the frequency range for heavy concrete floors are an issue. The frequency range of from 50 Hz down to 20 Hz influences the human perception of impact sound in multi-story apartment buildings with lightweight floor constructions, such as timber floors, for example. It is well known that a lower frequency range of interest makes finite element simulations more feasible. Strategies for reducing impact sound tend to be less straightforward for timber floors because they have a larger variation of designs when compared to concrete floors. This implies that reliable finite element simulations of impact sound can save time and money for the building industry. This study researches the impact sound transmission of lightweight timber floors. Frequency response functions, from forces on excitation points to sound pressure in the receiving cavity below, are calculated. By using fluid elements connected to reflection-free boundary elements under the floors in the models, the transmission and insulation can be studied without involving reverberation. A floor model with a hard screed surface will have a larger impact force than a softer floor, although this issue seems less pronounced at the lowest frequencies. To characterize floor surfaces, the point mobilities of the impact points are also calculated and presented. The vibration and sound transmission levels are dependent on the selection of the excitation points.

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“…Thus, in order to use damping for a frequency interval like one-third octaves, it would be better to connect each measurement position to its specific composition of modes and its specific damping. This means that for each measurement position of impact sound, for instance, there should be a corresponding measurement of its decay time (like the measurements points proposed in Olsson and Linderholt [17]). The main challenge may now be in mediumsized to larger sized rooms in the lowest frequencies with high sound absorption.…”

Section: Low Frequency Measurementsmentioning

confidence: 99%

Incremental use of FFT as a solution for low BT-product reverberation time measurements

et al. 2023

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Low-frequency impact sound pressure fields in small rooms within lightweight timber buildings – suggestions for simplified measurement procedures

Cited by 6 publications

References 0 publications

The Influence of Insulating Layers on the Acoustic Performance of Lightweight Frame Floors Intended for Use in Residential Buildings

The Influence of Insulating Layers on the Acoustic Performance of Lightweight Frame Floors Intended for Use in Residential Buildings

Low-frequency impact sound of timber floors: A finite element–based study of conceptual designs

Incremental use of FFT as a solution for low BT-product reverberation time measurements

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