Modelling and characterization of airborne noise sources

Bobrovnitskiĭ, Yu. I.; Pavić, Goran

doi:10.1016/s0022-460x(02)00981-1

Cited by 20 publications

(9 citation statements)

References 13 publications

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“…The blocked force has gained popularity within the structural dynamics community for the independent characterisation of vibration sources through the in-situ blocked force approach [13]. Similarly, Bobrovnitski and Pavic have made use of the blocked pressure to independently characterise acoustic sources [15].…”

Section: Equivalent Source Description and Justificationmentioning

confidence: 99%

“…the in-duct application), the notion of a stress tensor reduces to the normal stress component and consequently a scalar pressure. Further confidence in the application of this theorem to an acoustic case is gained from [15], where Bobrovnitskii's 2nd representation (i.e. a blocked pressure relation) is used to characterise an acoustic source.…”

Section: Acknowledgementsmentioning

confidence: 99%

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Broadband characterisation of in-duct acoustic sources using an equivalent source approach

Meggitt

Elliott

Moorhouse

et al. 2019

Journal of Sound and Vibration

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Section: Equivalent Source Description and Justificationmentioning

confidence: 99%

Section: Acknowledgementsmentioning

confidence: 99%

Broadband characterisation of in-duct acoustic sources using an equivalent source approach

Meggitt

Elliott

Moorhouse

et al. 2019

Journal of Sound and Vibration

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“…In white goods, there are airborne and structure‐borne noise caused by motors, fans, and mechanical vibrations. Airborne noise is generated by the movement of large volumes of high‐pressure air . Hard and rigid structural parts such as plastics and metals are vibrated by the impact of sound waves and transmit the acoustic energy to other parts, which cause the structure‐borne (vibration) noise problem .…”

Section: Introductionmentioning

confidence: 99%

“…Airborne noise is generated by the movement of large volumes of high-pressure air. 1,2 Hard and rigid structural parts such as plastics and metals are vibrated by the impact of sound waves and transmit the acoustic energy to other parts, which cause the structure-borne (vibration) noise problem. 1,3 Noise insulation materials are used between these parts to reduce the vibration in washing machines, dish washers, tumble dryers, etc.…”

Section: Introductionmentioning

confidence: 99%

Design of electrospun polyacrylonitrile nanofiber–coated nonwoven structure for sound absorption

Öztürk

Nergis

Candan

2017

Polymers for Advanced Techs

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Acoustic felts are commonly used in white goods. Bearing that into mind, this paper aims to enhance sound absorption behavior of such felts, in particular, within the low and medium frequency ranges. In doing so, wool and jute felt samples were coated with electrospun polyacrylonitrile nanofibrous membrane. These nanocoated felts were studied in terms of their sound absorption performance, air permeability, and surface morphology. The results indicated that the air permeability of the felts could be drastically decreased by coating with nanofibers, which was required for better acoustic performance of felt‐like structures. Moreover, the samples having higher amount polyacrylonitrile nanofibers tended to demonstrate better sound absorbency.

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“…Based on this result, a particular characterisation technique for airborne noise sources has been conceived in [16]. It consists in defining the source in terms of an enveloping spherical surface.…”

Section: Introductionmentioning

confidence: 99%

Noise source characterisation using patch impedance technique

Pavić

Totaro

2008

The Journal of the Acoustical Society of America

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defined via a suitable enveloping interface surface by its blocked sound pressure and its surface impedance. Both the blocked pressure and the impedance is made discrete using the averaging patch concept. Such a definition avoids singularity of point acoustic impedance and is suitable for numerical as well as experimental implementation. The characterisation of a source by the patch concept allows for the acoustical sub-structuring, which in turn enables the prediction of the sound field created by the source coupled to an arbitrary environment. Numerical simulations are presented which demonstrate the feasibility of the approach. It is hoped that the proposed approach can serve as a tool for noise synthesis of complex equipment incorporating noise sources.

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Modelling and characterization of airborne noise sources

Cited by 20 publications

References 13 publications

Broadband characterisation of in-duct acoustic sources using an equivalent source approach

Broadband characterisation of in-duct acoustic sources using an equivalent source approach

Design of electrospun polyacrylonitrile nanofiber–coated nonwoven structure for sound absorption

Noise source characterisation using patch impedance technique

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