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Abstract

Low-frequency floor-impact noise is the principal acoustic shortcoming of cross-laminated-timber (CLT) construction, yet current single-number ratings are rooted in tapping-machine spectra and under-represent heavy/soft human impacts below 100 Hz. We couple a validated plate–beam finite-element model of a two-story CLT test building to a rectangular room-acoustic model and generate 12 auralized stimuli—three slab thicknesses (150, 210, and 270 mm) with and without mid-span and quarter-span beams, each excited by literature-based jump-type (1.2 kN, 20 ms) and run-type (0.6 kN, 30 ms) forces. The frequency-domain responses are converted to time waveforms via inverse FFT and reproduced, after full transfer-path equalization, to 20 normal-hearing adults in a semi-anechoic room. Psychophysical scaling employs magnitude estimation (ME) for all stimuli and paired comparison (PC) for the six jump-type cases, while the objective descriptor is the event maximum level L_AFmax (ISO 717-2:2020, Annex D). Beam integration lowers L_AFmax by 1.9, 1.3, and 5.9 dB for the 150, 210, and 270 mm slabs, respectively, with a mean reduction of 3.1 dB; thicker slabs are consistently quieter than thinner ones. ME geometric means correlate strongly with L_AFmax (r = 0.88, semi-log fit, R² = 0.77), and the PC loudness scale shows a comparable association (r = 0.85, R² = 0.73), confirming that event-level attenuation translates directly to perceived quietness. Results demonstrate that beam integration is an effective structural lever for sub-100 Hz impact noise and that L_AFmax, evaluated on simulation or rubber-ball tests, provides a perceptually grounded design metric that complements conventional ratings.

Keywords

CLT floor-impact sound auralization magnitude estimation paired comparison beam integration low-frequency acoustics

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References

International Organization for Standardization. ISO 10140-3:2021 acoustics—laboratory measurement of sound insulation of building elements—part 3: measurement of impact sound insulation. 2021. https://www.iso.org/standard/71371.html

International Organization for Standardization. ISO 717-2:2020 acoustics—rating of sound insulation in buildings and of building elements—part 2: impact sound insulation. 2020. https://www.iso.org/standard/71572.html

Scholl

Impact sound insulation: the standard tapping machine shall learn to walk!

Build Acoust 2001; 8(4): 245–256.

Ljunggren

Simmons

Hagberg

Correlation between sound insulation and occupants’ perception – proposal of alternative single number rating of impact sound. Appl Acoust 2014; 85: 57–68.

World Health Organization. Environmental noise guidelines for the European region. 2018. https://apps.who.int/iris/handle/10665/279952

Jeon

Sato

SI.

Annoyance caused by heavyweight floor impact sounds in relation to the autocorrelation function and sound quality metrics. J Sound Vib 2008; 311(3-5): 767–785.

Jeon

Ryu

Lee

PJ.

A quantification model of overall dissatisfaction with indoor noise environment in residential buildings. Appl Acoust 2010; 71(10): 914–921.

Ryu

Sato

Kurakata

, et al. Relation between annoyance and single-number quantities for rating heavy-weight floor impact sound insulation in wooden houses. J Acoust Soc Am 2011; 129(5): 3047–3055.

Öqvist

Ljunggren

Johnsson

Walking sound annoyance vs. impact sound insulation from 20 Hz. Appl Acoust 2018; 135: 1–7.

10.

Di Bella

Granzotto

Barbaresi

. Analysis of acoustic behavior of bare CLT floors for the evaluation of impact sound insulation improvement. Proc Meet Acoust 2016; 28: 015016.

11.

Caniato

Bettarello

Fausti

, et al. Impact sound of timber floors in sustainable buildings. Build Environ 2017; 120: 110–122.

12.

Vardaxis

Bard Hagberg

Dahlström

Evaluating laboratory measurements for sound insulation of cross-laminated timber (CLT) floors: configurations in lightweight buildings. Appl Sci 2022; 12(15): 7642.

13.

Amiryarahmadi

Kropp

A virtual design studio for low frequency impact sound from walking. Acta Acustica 2021; 5: 40.

14.

Vorländer

Auralization: fundamentals of acoustics, modelling, simulation, algorithms and acoustic virtual reality. Springer, 2008.

15.

Muhammad

Heimes

Vorländer

Interactive real-time auralization of airborne sound insulation in buildings. Acta Acustica 2021; 5: 19.

16.

Asakura

Mizunuma

Kasai

, et al. Prediction of low-frequency floor impact vibration of CLT structures using a single-layer FE model. J Build Eng 2024; 98: 111336.

17.

Kuttruff

(ed.). Room acoustics. 6th ed. CRC Press, 2016.

18.

Pierce

(ed.). Acoustics: an introduction to its physical principles and applications. 3rd ed. Springer/ASA Press, 2019.

19.

Jeon

Lee

Sato

SI.

Use of the standard rubber ball as an impact source with heavyweight concrete floors. J Acoust Soc Am 2009; 126(1): 167–178.

20.

Park

Jeon

Park

Force generation characteristics of standard heavyweight impact sources used in the sound generation of building floors. J Acoust Soc Am 2010; 128(6): 3507–3512.

21.

Homb

Low-frequency sound and vibrations from impacts on timber floor constructions. PhD Thesis, Norwegian University of Science and Technology, 2005.

22.

Pańtak

Ground reaction forces generated by runners—harmonic analyses and modelling. Appl Sci 2020; 10(5): 1575.

23.

Play

Trama

Millet

, et al. Soft tissue vibrations in running: a narrative review. Sports Med 2022; 8(1): 131.

24.

Nilsson

Thorstensson

Ground reaction forces at different speeds of human walking and running. Acta Physiol Scand 1989; 136(2): 217–227.

25.

Stevens

SS.

The direct estimation of sensory magnitudes-loudness. Am J Psychol 1956; 69(1): 1–25.

26.

Thurstone

LL.

A law of comparative judgment. Psychol Rev 1927; 34(4): 273–286.

27.

Scheffe

An analysis of variance for paired comparisons. J Am Stat Assoc 1952; 47(259): 381–400.

28.

World Medical Association. Declaration of Helsinki: ethical principles for medical research involving human subjects. 2013. https://doi.org/10.1001/jama.2013.281053

29.

Ministry of Health, Labour and Welfare. Ethical guidelines for medical and biological research involving human subjects. 2021. https://www.mext.go.jp/content/20250325-mxt_life-000035486-01.pdf

30.

CEN–CENELEC. EN 50332-1:2013 sound system equipment: headphones and earphones associated with personal music players—part 1: method for measuring the maximum sound pressure level produced by the electro-acoustic transducer(s). 2021.

31.

CEN–CENELEC. EN 50332-2:2013 sound system equipment: headphones and earphones associated with portable audio equipment—part 2: matching of sets with music players (maximum output voltage method). 2013.

32.

Won

D-G

Kim

YH.

A literature review of floor impact noise characteristics in wooden apartment buildings using cross-laminated timber slab. INTER-NOISE and NOISE-CON 2023; 268: 4180–4183.

33.

Fahy

Gardonio

(eds). Sound and structural vibration: radiation, transmission and response. 2nd ed. Elsevier, 2007.

34.

Cremer

Heckl

Petersson

(eds). Structure-borne sound: structural vibrations and sound radiation. 3rd ed. Springer, 2005.

35.

Takahashi

Sound radiation from periodically connected double-plate structures. J Sound Vib 1983; 90(4): 541–557.

36.

Reynders

Hoorickx

Dijckmans

CA.

Semi-discrete coincidence in the mid-frequency sound transmission through rib-stiffened panels. In: Proceedings of the international congress on sound and vibration, 2016, pp.7620–7627. DOI: 10.7712/100016.2358.11941.

37.

Lim

Putra

Thompson

, et al. Preliminary study on characteristics of sound radiation from beam-stiffened plates. Int Rev Mech Eng 2016; 10(4): 272–278.

38.

Tang

Tian

Shang

Faster calculation of the low-frequency radiated sound power of underwater slender cylindrical shells. Math Probl Eng 2020; 2020: 1–10.

39.

Neves

Sousa

Gibbs

BM.

Low frequency impact sound transmission in dwellings through homogeneous concrete floors and floating floors. Appl Acoust 2011; 72(4): 177–189.

Low-frequency impact sound in CLT floors: Perceptual gains from beam integration

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