Development of Standard Heavy Impact Source for Measurement of Floor Impact Sound

Inoue, Katsuo; Yasuoka, Masahito; Tachibana, Hideki

doi:10.3130/aijt.7.143

Cited by 5 publications

(5 citation statements)

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“…Compared with these heavyweight impactors, the lightweight impactor of the tapping hammer shows relatively short duration time and has higher frequency components. Figure 7 shows the impact force exposure levels of these impactors along with the measurement results from [39,40]. In these results, the frequency characteristics of these impactors also show agreement with the reference data.…”

Section: Accuracy Of Simulated Forcessupporting

confidence: 65%

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Finite-difference time-domain simulation of floor-impact sound excited by one-dimensional contact model and its application to auralization of floor-impact sound

Asakura

2021

Acoust. Sci. & Tech.

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Section: Accuracy Of Simulated Forcessupporting

confidence: 65%

“…Numerical results of excitation forces of (a) bang machine, (b) impact ball, and (c) tapping hammer, and reference data[2,14]. meas [39],. black: calc.…”

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confidence: 99%

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Finite-difference time-domain simulation of floor-impact sound excited by one-dimensional contact model and its application to auralization of floor-impact sound

Asakura

2021

Acoust. Sci. & Tech.

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“…However, an impact ball, which has small impact force and stable reproducibility, was recently developed as a heavy=soft impact source (Inoue et al, 2000(Inoue et al, , 2001. It has also been adopted in standards (JIS A 1418(JIS A -2, 2000ISO 140-11, 2005).…”

Section: Introductionmentioning

confidence: 99%

Relation between annoyance and single-number quantities for rating heavy-weight floor impact sound insulation in wooden houses

Ryu¹,

Satō²,

Kurakata³

et al. 2011

The Journal of the Acoustical Society of America

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This study investigated the relation between annoyance and single-number quantities to rate heavy-weight floor impact sound insulation. Laboratory experiments were conducted to evaluate the subjective response of annoyance resulting from heavy-weight floor impact sounds recorded in wooden houses. Stimuli had two typical spectra and their modified versions, which simulate the precise change in frequency response resulting from insulation treatments. Results of the first experiment showed that the Zwicker's percentile loudness (N(5)) was the quantity to rate most well annoyance of heavy-weight impact sound over a wide sound level range. The second experiment revealed that arithmetic average (L(iFavg,Fmax)) of octave-band sound pressure levels measured using the time constant "fast" and Zwicker's percentile loudness (N(5)) much better described annoyance by the precise change in the sound spectrum attributable to insulation treatments than Japanese standardized single-number quantities (L(i,Fmax,r), L(iA,Fmax), and L(i,Fmax,Aw)) do. Japanese standardized single-number quantities using the A-weighting curve as a rating curve were found to be excessively influenced by the 63 Hz octave-band sound level and have the great sound level-dependences in the relation with subjective ratings.

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“…研究を継続的に行った (多々良, 森脇, 1981，Tatara, 1983，1991).また，衝撃試験で広く用いられるゴムストライカーの衝撃力の精密な表現を試みた研究，ジェル球の衝突大変形を扱った研究もある．従来の球衝突研究が中実球を対象としたものであるのに対し，人の歩行時の床面衝撃力特性を模擬することを目的として，建築物の床衝撃音測定の衝撃源として中空ゴム球の落下衝撃特性が研究されてきた (Inoue et al , , 井上, 2001(Inoue et al , , 2003 Hertz の衝突理論(Hertz 接触理論に基づく非線形ばねで支持された 1 自由度振動系応答)によれば Goodeir, 1970，日本機械学会, 2001 1st mode 2nd mode 3rd mode 4th mode…”

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Impact of dropped hollow rubber sphere on plate

Iwamoto

Saigo²,

Inoue

et al. 2021

Transactions of the JSME (In Japanese)

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This paper deals with the impact of dropped hollow rubber spheres against a planar surface. Hollow silicon rubber spheres are used as the impact source of the measurement of the floor impact sound insulation of buildings, but the impact characteristics have not been investigated. In order to clear the impact characteristics and show a strategy of a development of another type of source, we have conducted some experiments, FEM simulation on LS-DYNA and a one-dimensional mass-and-spring model analysis. The experiment of the impact of 4 types of rubber spheres, two hollow spheres with an outer radius of 90 mm and two solid spheres with a radius of 60 mm and 40 mm, against a surface plate were conducted. As the FEM solutions corresponded qualitatively with the experimental results, the impact analysis was done based on the FEM results. The FEM solution shows the shock stress propagation in a hollow sphere has two steps; the 'first period' is the stress propagation in a solid thickness part similar in a solid sphere and the following period is that to the hollow part of sphere. The frequency response of the impact force shows 'notch' frequencies correspond to the natural frequencies of the hollow sphere of free-free boundary condition. This is the key point to analyze the impact characteristics of dropped hollow spheres. We investigated the relations between durations, natural frequencies of free-free boundary condition and notch frequencies of impact in relation to the thickness ratio of hollow sphere. We have presented a simple model to estimate the duration and the peak impact of dropped hollow sphere for an actual design.

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Development of Standard Heavy Impact Source for Measurement of Floor Impact Sound

Cited by 5 publications

References 0 publications

Finite-difference time-domain simulation of floor-impact sound excited by one-dimensional contact model and its application to auralization of floor-impact sound

Finite-difference time-domain simulation of floor-impact sound excited by one-dimensional contact model and its application to auralization of floor-impact sound

Relation between annoyance and single-number quantities for rating heavy-weight floor impact sound insulation in wooden houses

Impact of dropped hollow rubber sphere on plate

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