Low frequency sound insulation analysis and evaluation of stiffened building structures

Ou, Dayi

doi:10.1016/j.buildenv.2015.05.016

Cited by 19 publications

(18 citation statements)

References 34 publications

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“…The plate is with arbitrary elastic boundary supports along the edges and its length, width, and thickness are L x , L y , and h, respectively. The vibration response of the undamped plate system with fluid loading is determined by the coupled FEM-BEM method 18,26 as…”

Section: Hydroelastic Vibration Analysis Modelmentioning

confidence: 99%

“…where v is the natural angular frequency, ½M is the plate's mass matrix, ½K is the plate's stiffness matrix, fFg is the external force applied on the plate, the vector fU g represents the plate's nodal displacement, the vectors fP + g and fP À g are radiated sound pressures on the both sides of the plate surface (in medium V1 and in medium V2, respectively), and the transformation matrix fT g is used to convert the sound pressure to the nodal force acting on the plate. The sound pressures on the both sides of the plate surface by the BEM model can be given as 18,22,27,28…”

Section: Hydroelastic Vibration Analysis Modelmentioning

confidence: 99%

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Modification of boundary condition for the optimization of natural frequencies of plate structures with fluid loading

Mak

2018

Advances in Mechanical Engineering

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A finite element method, boundary element method, and genetic algorithm combined method is developed for the optimization of natural frequencies of fluid-loaded plates. In this method, the coupled finite element method-boundary element method is used for the free flexural vibration analysis of plates with arbitrary fluid loading effects and arbitrary elastic boundary conditions, and the genetic algorithm method is combined with the finite element method-boundary element method for searching the optimal values of plate's boundary parameters. By using this method, multiple natural frequencies of a given fluid-loaded plate can be optimized simultaneously to different target values. The coupled finite element method-boundary element method is first validated by comparing with earlier published results. The proposed optimization method is then applied to the optimal boundary condition design of four different cases. The results show natural frequencies of a fluid-loaded plate are sensitive to its boundary conditions. The possibility of optimizing the natural frequencies of a fluid-loaded plate by modifying boundary conditions is demonstrated, as well as the effectiveness of the proposed method as a structural optimization tool. According to the authors' knowledge, this study is the first attempt of optimizing fluid-loaded plate natural frequencies by considering arbitrary boundary conditions as optimization variables.

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Section: Hydroelastic Vibration Analysis Modelmentioning

confidence: 99%

Section: Hydroelastic Vibration Analysis Modelmentioning

confidence: 99%

Modification of boundary condition for the optimization of natural frequencies of plate structures with fluid loading

Mak

2018

Advances in Mechanical Engineering

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“…These thresholds present the sound pressure levels at which subjective response to direct exposure to low frequency sound changes as functions of frequency from one characterization to another. Based on the Tokita and Nakanura Thresholds, a single-number rating method called low frequency sound transmission class (LFSTC) is recently developed [13], which is useful for assessing the structural sound insulation in the low frequency range (20Hz∼250Hz). The rating indicator, LFSTC O&N , is defined by this singlenumber rating method, which is developed based on the "oppression and noisy" threshold and is suitable for the case when high level LFS is present.…”

Section: Single-number Rating Indicators For Low Frequency Sound Insumentioning

confidence: 99%

“…The reference contour used for calculating LFSTC O&N is given in Table 1 (in 1/3 octave bands). More details about this method can be found in [13].…”

Section: Single-number Rating Indicators For Low Frequency Sound Insumentioning

confidence: 99%

An Optimization Method for Maximizing the Low Frequency Sound Insulation of Plate Structures

2018

Shock and Vibration

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A combined approach based on finite element method, boundary element method, and genetic algorithm (FEM-BEM-GA) is proposed for optimizing the low frequency sound (LFS) insulation performance of plate structures. This approach can identify the optimal structural parameters (especially concerning the effects of arbitrary boundary conditions) so as to maximize the structural overall LFS insulation. The basic ideas of this approach are as follows: (1) the sound transmission loss (TL) analysis of a plate with arbitrary boundary conditions is conducted by the coupled FEM-BEM method; (2) the single-number rating method (such as low frequency sound transmission class) is used to assess the plate’s overall LFS insulation; and (3) the genetic algorithm (GA) is employed for searching the optimal solutions of the multiple-parameter optimization problem. The proposed approach is subsequently illustrated by numerical studies. The results show the effectiveness of consideration of the effects of boundary condition in the plate’s LFS insulation optimization and demonstrate the feasibility and effectiveness of this approach as a structure design tool.

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“…При создании искусственных структур часто используется внедрение систем препятствий в виде вырезов, канавок, ребер жесткости или точечных дефектов [11], [12]. Данный подход обусловлен эффектом захваченного режима.…”

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Prediction of Sound Insulation of Flexible Panels in Low Frequencies With Dynamics and Volume Relations

Romanenko¹,

Russkikh²,

Sokolovskiy³

2018

DSMM

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Low frequency sound insulation analysis and evaluation of stiffened building structures

Cited by 19 publications

References 34 publications

Modification of boundary condition for the optimization of natural frequencies of plate structures with fluid loading

Modification of boundary condition for the optimization of natural frequencies of plate structures with fluid loading

An Optimization Method for Maximizing the Low Frequency Sound Insulation of Plate Structures

Prediction of Sound Insulation of Flexible Panels in Low Frequencies With Dynamics and Volume Relations

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