A STUDY ON PREDICTION OF HEAVY WEIGHT FLOOR IMPACT SOUND LEVEL WITH SOUND RADIATION AROUND WALL : Example of uncoupling-model on vibration field and sound field by finite element method

智史, 久米; 岳史, 石丸; 史洋, 高倉; 雅直, 大脇; 恭弘, 山下

doi:10.3130/aije.71.9_3

Cited by 2 publications

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“…In the field of architectural acoustics, the boundary element method (BEM), the finite element method (FEM), and the finite-difference time-domain (FDTD) method have been widely used for numerical analyses of wave acoustics [1]. The FEM alone and a hybrid method of the FEM and the BEM are commonly used, especially for vibroacoustic problems [2][3][4]. In this paper, the possibility of the FDTD method, which considers both longitudinal and shear waves, is investigated as a new prediction method for architectural structure-borne sound.…”

Section: Introductionmentioning

confidence: 99%

Prediction for architectural structure-borne sound by the finite-difference time-domain method

Toyoda

Takahashi

2009

Acoust. Sci. & Tech.

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Herein the possibility of the FDTD method, which considers longitudinal and shear waves and two types of damping terms, is investigated as a new prediction method for architectural structureborne sound. Equations of motion and Hooke's laws of three-dimensional elastic bodies are directly discretized with a difference scheme of the leap-flog algorithm. Using these formulations, vibrationmode transformations at the junctions of building frames can be considered without special handling. This method seems to be especially effective for providing both visible and audible predictions because time responses can be obtained directly. First, the formulations and the stability condition are discussed. Next, a parallel computing algorithm to efficiently perform the FDTD calculation is introduced. Finally, the predicted results are compared to the measured data from the viewpoints of energy decay and frequency characteristics. From these comparisons, it is confirmed that the predicted results and the measured data are in good agreement if the appropriate damping terms are employed.

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Section: Introductionmentioning

confidence: 99%