Prediction Models of Impact Sound Insulation on Timber Floor Structures; A Literature Survey

Brunskog, Jonas; Hammer, Per

doi:10.1260/1351010001501525

Cited by 22 publications

(14 citation statements)

References 60 publications

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“…In the present work, the extensional, flexural and torsional motions of the composite stiffeners are taken into account in Eq. (11). To explore the influences of the coupling effects of the composite stiffeners, the sound transmission losses of the whole structure with complete motions and with only flexural motion of the composite stiffeners are compared in Fig.…”

Section: Different Beam Stiffener Theoriesmentioning

confidence: 99%

“…Many useful theoretical models have been built to solve the problem of stiffened plate under various operating conditions, and there are a few favorable review papers [10][11][12] to refer to. A few of important literatures limited to deterministic method are emphasized below to describe the state of art of investigation of orthogonally stiffened composite plate.…”

Section: Introductionmentioning

confidence: 99%

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Transmission loss of orthogonally stiffened laminated composite plates

Shen

Xin

2015

J Mech Sci Technol

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Sound transmission through laminated composite plates reinforced by two sets of orthogonal stiffeners is investigated theoretically. A layerwise shear deformable theory is used to model the vibration of the laminated composite face-panel; A governing equation of I section composite beam is introduced, which accounts for the extensional, flexural, torsional and their coupling effects. The Euler-Bernoulli beam theory and torsional wave equation are employed to describe the flexural and rotational motions of the rib stiffeners, respectively. The technique of Fourier transform is applied to solve the governing equations resulting in infinite sets of simultaneous algebraic coupled equations, which are numerically solved by truncating them into a finite range insofar as the solutions converge. The accuracy of the numerical solutions is checked by comparing the present model predictions with existing literature. The validated model is subsequently employed to quantify the effects of the spacing of the stiffeners and the stacking geometry of the laminated composite face-panel and stiffeners on sound transmission through the structure. It is demonstrated that both the stiffener spacing and the stacking geometry have significant influences on the sound transmission loss across the structure. The proposed theoretical model successfully characterizes the process of sound penetration through stiffened laminated composite plates, which should be much helpful for the practical design of such structures with acoustic requirements.

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Section: Different Beam Stiffener Theoriesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transmission loss of orthogonally stiffened laminated composite plates

Shen

Xin

2015

J Mech Sci Technol

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“…Phononic crystals [1][2][3][4][5], a kind of periodic structure [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], are materials or structures with spatial periodicities in the form of constituent material phases, geometrical configurations, or boundary conditions. They possess frequency bands that can be exploited to control sonic, acoustic, or elastic wave propagation.…”

Section: Introductionmentioning

confidence: 99%

“…They possess frequency bands that can be exploited to control sonic, acoustic, or elastic wave propagation. It is known that defects in phononic crystals or disorders in periodic structures might lead to wave/vibration localization [5,7,8,[13][14][15][16][17][18]. Several authors [5,[14][15][16][17][18][19][20][21][22] have provided comprehensive literature reviews about the effect of defects or disorders in various one-dimensional linear phononic crystals or periodic structures on the wave/vibration localization.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Bending Waves in Phononic Crystal Beams with Defects

Guo

Chuang

2018

Crystals

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Existing investigations on imperfect phononic crystal beams mainly concern periodic multi-span beams carrying either one or two channel waves with random or deterministic disorder in span-length. This paper studies the two channel bending waves in phononic crystal beams consisting of many phases of materials with defects introduced as one structural segment having different cross-sectional dimensions or material parameters. The method of reverberation-ray matrix (MRRM) based on the Timoshenko beam theory, which can conduct high-frequency analysis, is extended for the theoretical analysis of dispersion and transmission of bending waves. The supercell technique and the Floquet-Bloch theorem are adopted for modeling the dispersion characteristics, and the whole finite structural model is used to calculate the transmission spectra. Experimental measurements and numerical calculations are provided to validate the displacement transmission obtained by the proposed MRRM, with the effect of damping on transmission spectra being concerned. The high-frequency calculation applicability of the proposed MRRM is also confirmed by comparing the present results with the corresponding ones either using the transfer matrix method (TMM) or MRRM based on Euler-Bernoulli beam theory. The influences of defect size, defect form, and unit-cell number on the transmission spectra and the band structures are discussed. The drawn conclusions may be useful for designing or evaluating the defected phononic crystal beams in bending wave control. In addition, our conclusions are especially potential for identifying the defect location through bending wave signals.

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“…A literature survey of available deterministic prediction methods that takes periodicity into account can be found in Ref. 20 ͑with focus on point excitation͒.…”

Section: Introductionmentioning

confidence: 99%

The influence of finite cavities on the sound insulation of double-plate structures

Brunskog

2005

The Journal of the Acoustical Society of America

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Lightweight walls are often designed as frameworks of studs with plates on each side--a double-plate structure. The studs constitute boundaries for the cavities, thereby both affecting the sound transmission directly by short-circuiting the plates, and indirectly by disturbing the sound field between the plates. The paper presents a deterministic prediction model for airborne sound insulation including both effects of the studs. A spatial transform technique is used, taking advantage of the periodicity. The acoustic field inside the cavities is expanded by means of cosine-series. The transmission coefficient (angle-dependent and diffuse) and transmission loss are studied. Numerical examples are presented and comparisons with measurement are performed. The result indicates that a reasonably good agreement between theory and measurement can be achieved.

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Prediction Models of Impact Sound Insulation on Timber Floor Structures; A Literature Survey

Cited by 22 publications

References 60 publications

Transmission loss of orthogonally stiffened laminated composite plates

Transmission loss of orthogonally stiffened laminated composite plates

Analysis of Bending Waves in Phononic Crystal Beams with Defects

The influence of finite cavities on the sound insulation of double-plate structures

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