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

To develop a numerical method of determining the time and frequency characteristics of the external forces excited by various impact sources, the collision between the free-fall mass and the elastic platelike structure are modeled by the one-degree-of-freedom contact model structured on the discrete...

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Bibliographic Details
Published in:Acoustical Science and Technology 2021/01/01, Vol.42(1), pp.22-35
Main Author: Asakura, Takumi
Format: Article
Language:English
Subjects:
Acoustics
Bending vibration
Concrete structures
Elastic scattering
Finite difference time domain method
Floor-impact sound
Floors
Impact vibration
Loudness
Mathematical analysis
Mathematical models
Numerical analysis
Numerical methods
Simulation
Sound
Sound pressure
Time domain analysis
Vibration analysis
Voigt model
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Summary:To develop a numerical method of determining the time and frequency characteristics of the external forces excited by various impact sources, the collision between the free-fall mass and the elastic platelike structure are modeled by the one-degree-of-freedom contact model structured on the discrete wave-based numerical analysis of bending vibration with the finite-difference time-domain (FDTD) method. Moreover, the calculated impact sounds were auralized and applied to the evaluation experiment of the subjective impression of loudness and annoyance. As the basic study, the excitation characteristics of generally used devices that is, the impact ball, bang machine, and tapping machine and human trotting are simulated and used for a numerical simulation targeting the prediction of the impact sound pressure levels inside a wall-type concrete structure. After that, the proposed method was applied to a subjective evaluation experiment of the loudness and annoyance influenced by a floor-impact sound on various types of floor slab. The results have shown that the loudness and annoyance induced by the floor-impact sound indicated a high correlation with the maximum A-weighted sound pressure level.
ISSN:1346-3969
1347-5177
DOI:10.1250/ast.42.22