Experimental Research on Prediction Structure-Borne Sound Due to the Environmental Ground Vibration

Kobayashi, Masahito; Shioda, Masazumi; Yamashita, Yasuhiro

doi:10.3130/aija.66.23_4

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…A prediction technique is examined for structure-borne sound inside buildings from environmental ground vibration resulting from railways, road traffic and construction work [1,2]. Sound radiation from vibrating surfaces is studied by relating the vibration velocity of the surface and the sound radiation power.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Sound Radiation from Building Structures by Multiple Input-Single Output Model Analyses

et al. 2003

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The influence of the sound radiation from surfaces is examined from a prediction of structureborne sound. The level of structure-borne sound due to environmental ground vibration is shown from a Multiple Coherent Output Spectrum, which represents common elements of all input vibration signals. The use of the Multiple Coherent Output Divided Spectrum at each surface is examined. A parameter is proposed which shows the contribution of structure-borne sound from the each surface of the room. The theory is considered for a system consisting of six speakers equivalent to the six surfaces of the room, and prediction compared with experimental results.

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Section: Introductionmentioning

confidence: 99%

Contribution of Sound Radiation from Building Structures by Multiple Input-Single Output Model Analyses

et al. 2003

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Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass

ISHIZAWA

TOMIOKA

2022

Transactions of the JSME (In Japanese)

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Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass AbstractRecently, one of the authors proposed a multi-modal and multi-axis vibration reduction device against elastic vibrations of structures. The device is called eMDVA (embedded Mass Dynamic Vibration Absorber). The eMDVA consists of a ball-like mass embedded in a spherical viscoelastic material. Therefore the embedded mass can vibrate in every direction in the viscoelastic medium. The vibration characteristics of the eMDVA are investigated experimentally and numerically in this paper. Three eMDVAs with different sizes of spherical viscoelastic material containing a ball-like mass with a triaxial acceleration pickup are made, and vibration measurement tests are conducted. The measurement results show that the frequency response function (FRF) of the acceleration of the embedded mass versus excitation force has a single dominant peak. The peak frequency can be changed according to the size of the viscoelastic sphere. A finite element (FE) model of the eMDVA is developed, and investigations to determine the viscoelastic properties as Prony series expression are carried out. It has been shown that the ordinary procedure to adjust the Prony coefficients to fit the complex Young's modulus obtained by a dynamic mechanical analysis (DMA) leads to less accuracy in calculating FRF. On the other hand, good agreement between numerical and measurement results can be achieved by directly adjusting the coefficients to fit the FRF curves. In addition, FRF curves of the eMDVAs having non-spherical shaped viscoelastic material are calculated using the FE model with the viscoelastic properties mentioned above. The FE analyses have shown that by changing the shape of the viscoelastic material from sphere to spheroid or ellipsoid, the FRF has a different peak frequency according to the vibration direction.

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質量球を粘弾性体に埋め込んだ制振デバイスの粘弾性特性の数値モデル構築に関する検討と多モード制振効果の実験的検証

TODA,

TOMIOKA,

ISHIZAWA

2024

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This paper describes the construction of the numerical model of a passive damping device called eMDVA (embedded Mass Dynamic Vibration Absorber) and experimental investigation of the eMDVA's multi-modal damping effect for elastic vibrations of a plate-like structure. The eMDVA consists of a ball-like mass embedded in a viscoelastic medium; and the mass can vibrate in every direction. When the thickness of the viscoelastic medium differs in the X, Y, and Z directions, the ball-like mass has different natural frequencies for every vibration direction. An appropriate numerical model that can predict these natural frequencies correctly is needed to design the eMDVA; in particular, defining the viscoelastic properties is an important and challenging subject. In this work, the Prony series is used to express the viscoelastic material, and the setting process of the coefficients in the Prony series is studied. It has been shown that using a sufficient number of terms in the Prony series and using sufficient measurement data to define their coefficient leads to good results in expressing the viscoelastic material. Using the constructed viscoelastic model, vibration characteristics of the eMDVA, such as the change of the natural frequencies versus the viscoelastic material's shape change and frequency response characteristics, are investigated numerically using a commercial finite element software Ansys. After that, an eMDVA is produced and applied to a plate-like elastic structure. A series of excitation tests are conducted, and the multi-mode vibration reduction effect by the eMDVA has been demonstrated.

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Experimental Research on Prediction Structure-Borne Sound Due to the Environmental Ground Vibration

Cited by 4 publications

References 3 publications

Contribution of Sound Radiation from Building Structures by Multiple Input-Single Output Model Analyses

Contribution of Sound Radiation from Building Structures by Multiple Input-Single Output Model Analyses

Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass

質量球を粘弾性体に埋め込んだ制振デバイスの粘弾性特性の数値モデル構築に関する検討と多モード制振効果の実験的検証

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