Coupling of sound spaces by plane surface harmonics and its application to sound source characterization

Pavić, Goran; Du, Liang

doi:10.1016/j.jsv.2018.09.064

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…It is important to characterize a target in an intrinsic way for target identification and control [ 1 ]. To acquire the intrinsic acoustic characteristics of the target, the measurement must be carried out in the free field.…”

Section: Introductionmentioning

confidence: 99%

Recovering the Free-Field Acoustic Characteristics of a Vibrating Structure from Bounded Noisy Underwater Environments

Lin

2021

Sensors

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The vibrational behavior of an underwater structure in the free field is different from that in bounded noisy environments because the fluid–structure interaction is strong in the water and the vibration of the structure caused by disturbing fields (the reflections by boundaries and the fields radiated by sources of disturbances) cannot be ignored. The conventional free field recovery (FFR) technique can only be used to eliminate disturbing fields without considering the difference in the vibrational behavior of the structure in the free field and the complex environment. To recover the free-field acoustic characteristics of a structure from bounded noisy underwater environments, a method combining the boundary element method (BEM) with the vibro-acoustic coupling method is presented. First, the pressures on the measurement surface are obtained. Second, the outgoing sound field and the rigid body scattered sound field are calculated by BEM. Then, the vibro-acoustic coupling method is employed to calculate the elastically radiated scattered sound field. Finally, the sound field radiated by the structure in the free field is recovered by subtracting the rigid body scattered sound field and the elastically radiated scattered sound field from the outgoing sound field. The effectiveness of the proposed method is validated by simulation results.

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Section: Introductionmentioning

confidence: 99%

Recovering the Free-Field Acoustic Characteristics of a Vibrating Structure from Bounded Noisy Underwater Environments

Lin

2021

Sensors

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Prediction of sound reduction index of plenum window by the surface impedance approach

Lau

Lee

2021

Applied Acoustics

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Modeling of multiply connected sound spaces by the surface coupling approach

Pavić

2019

The Journal of the Acoustical Society of America

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The surface coupling approach is employed to predict the sound field in multiply connected spaces (rooms) with internal noise sources. The coupling is achieved by developing sound pressure and particle velocity at the interfaces between rooms in simple interface functions. Plane surface harmonics can be employed as interface functions where rectangular interfaces are concerned. Using the blocked sound pressure and impedance across the interface surfaces as acoustical descriptors, each room can be identified separately. The acoustical continuity conditions can then be applied to obtain the resulting sound field. Using this approach, the prediction of the sound field created by point sources in three connected parallelepipedic rooms was successfully carried out. The parametric study shows that the normalized harmonics wavenumber equal to 2 times the normalized sound wavenumber enables acceptable sound prediction. Further application was done by predicting sound energy flow of three monopole sources in a rectangular space coupled with a semi-infinite field.

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Coupling of sound spaces by plane surface harmonics and its application to sound source characterization

Cited by 4 publications

References 16 publications

Recovering the Free-Field Acoustic Characteristics of a Vibrating Structure from Bounded Noisy Underwater Environments

Recovering the Free-Field Acoustic Characteristics of a Vibrating Structure from Bounded Noisy Underwater Environments

Prediction of sound reduction index of plenum window by the surface impedance approach

Modeling of multiply connected sound spaces by the surface coupling approach

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