Contribution to the study of sound transmission and radiation of corrugated steel structures

Cordonnier-Cloarec, P.; Pauzin, S.; Biron, D.; Haddar, Mohamed; Hamdi, M. A.

doi:10.1016/0022-460x(92)90530-b

Cited by 14 publications

(3 citation statements)

References 6 publications

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“…by measuring the nearfield, sound intensity using the sound intensity probe [47,48] 2. by measuring the direct field far from the plate [49]. This can be done accurately in an anechoic chamber, a special room having walls with high absorption to suppress the reflected sound.…”

Section: Experimental Work and Methodsmentioning

confidence: 99%

Sound radiation from perforated plates

Putra

Thompson

2010

Journal of Sound and Vibration

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FACULTY OF ENGINEERING, SCIENCE AND MATHEMATICS INSTITUTE OF SOUND AND VIBRATION RESEARCH Doctor of Philosophy SOUND RADIATION FROM PERFORATED PLATES by Azma PutraPerforated plates are quite often used as a means of engineering noise control to reduce the sound radiated by structures. However, there appears to be a lack of representative models to determine the sound radiation from a perforated plate. The aim of this thesis is to develop such a model that can be used to give quantitative guidance corresponding to the design and effectiveness of this noise control measure.Following an assessment of various models for the radiation efficiency of an unbaffled plate, Laulagnet's model is implemented. Results are calculated and compared with those for baffled plates. From this, simple empirical formulae are developed and give a very good agreement with the analytical result. Laulagnet's model is then modified to include the effect of perforation in terms of a continuously distributed surface impedance to represent the holes. This produces a model for the sound radiation from a perforated unbaffled plate. It is found that the radiation efficiency reduces as the perforation ratio increases or as the hole size reduces. An approximate formula for the effect of perforation is proposed which shows a good agreement with the analytical calculation up to half the critical frequency. This could be used for an engineering application to predict the noise reduction due to perforation.The calculation for guided-guided boundary conditions shows that the radiation efficiency of an unbaffled plate is not sensitive to the edge conditions. It is also shown that perforation changes the plate bending stiffness and mass and hence increases the plate vibration.The situation is also considered in which a perforated unbaffled plate is located close to a reflecting rigid surface. This is established by modifying the Green's function in the perforated unbaffled model to include an imaginary source to represent the reflected sound. The result shows that the presence of the rigid surface reduces the radiation efficiency at low frequencies.The limitation of the assumption of a continuous acoustic impedance is investigated using a model of discrete sources. The perforated plate is discretised into elementary sources representing the plate and also the holes. It is found that the uniform surface impedance is only valid if the hole distance is less than an acoustic wavelength for a vibrating rectangular piston and less than half an acoustic wavelength for a rectangular plate in bending vibration. Otherwise, the array of holes is no longer effective to reduce the sound radiation.Experimental validation is conducted using a reciprocity technique. A good agreement is achieved between the measured results and the theoretical calculation for both the unbaffled perforated plate and the perforated plate near a rigid surface.

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Section: Experimental Work and Methodsmentioning

confidence: 99%

Sound radiation from perforated plates

Putra

Thompson

2010

Journal of Sound and Vibration

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“…Furthermore, to identify the vibroacoustic behavior of corrugated structures, significant scientific efforts have been made. In this regard, Cordonnier-cloarec et al (1992) investigated the sound transmission and radiation of corrugated steel structures. Tang et al (1996) examined sound transmission through a cylindrical multilayered shell with a honeycomb core.…”

Section: Introductionmentioning

confidence: 99%

An analytical study of the effects of a circumferentially corrugated core on sound transmission through double-walled cylindrical shells

Kornokar

Shahsavari

Daneshjou

et al. 2022

Journal of Vibration and Control

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Corrugated structures are widely being used in industrial applications, which raises the demand for careful analysis of their behavior. To fill the gap for vibroacoustic characteristics, this paper focuses on proposing a model to investigate sound transmission through double-walled cylindrical shells with a circumferentially corrugated core. The structure is composed of outer and inner isotropic layers and a corrugated core. The outer layer is subjected to an oblige plane wave, and also a subsonic flow is traveling outside the double-walled shell. An equivalent method is applied to replace the corrugated core as axial, radial, and rotational springs with specific stiffness coefficients. The first-order shear deformation theory (FSDT) is applied to describe the behavior of isotropic shells. A considerable parametric study is established concerning both the incident wave and structural characteristics. The results show that the presence of the corrugated core improves sound transmission loss (STL) of the structure in the mass-controlled region, and it has a negative effect on STL in the coincidence-controlled region; therefore, using such a core for sound insulation depends on the desired frequency domain.

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“…However this could not be proved conclusively and no better method of predicting the performance of corrugated metal panels was forwarded. P. Cordonnier-Cloarec et al 4 compared the intensity method measured SRI of a corrugated plate with predictions by a numerical approach using a combination of structural finite elements and fluid boundary element method. However their study did not pay particular attention to the possible causes of the mid frequency "dips".…”

Section: Introductionmentioning

confidence: 99%

Noise Transmission Through Profiled Metal Cladding Part I: Single Skin Measurements

Lam

Windle

1995

Building Acoustics

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The sound reduction of single-skin trapezoidal profiled metal cladding systems often displays pronounced "dips" in mid frequency range. Because of their magnitude and frequency range. these "dips" can be a critical limiting factor in a cladding system's performance towards insulating noise from industrial premises. This paper investigates in detail the sound reduction of these cladding systems. A series of sound reduction measurements employing a systematic and comprehensive change of profile geometry involving 15 cladding systems was conducted to examine the effect of the profile geometry on the sound reduction "dips". It is suggested that the "dips" are caused by resonant vibration modes that are local to the geometry of a profile corrugation. Vibration measurements on cladding sheets excited by a diffuse field in a transmission suite and on free hanging cladding sheets excited by a normal incidence plane wave in an anechoic chamber were conducted to test and confirm the explanation.

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Contribution to the study of sound transmission and radiation of corrugated steel structures

Cited by 14 publications

References 6 publications

Sound radiation from perforated plates

Sound radiation from perforated plates

An analytical study of the effects of a circumferentially corrugated core on sound transmission through double-walled cylindrical shells

Noise Transmission Through Profiled Metal Cladding Part I: Single Skin Measurements

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