Interior near-field acoustical holography in flight

Williams, Earl G.; Houston, Brian H.; Herdic, Peter C.; Raveendra, S. T.; Gardner, Bryce

doi:10.1121/1.1289922

Cited by 91 publications

(28 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Experience of previous work (e.g. [9,12,13]) has shown also that the estimation of v S and p S by this method tends to become more unstable as the DOF (i.e. the number of surface nodes) increases.…”

Section: Iterative Estimation Of the Acoustic Impedancesmentioning

confidence: 99%

See 1 more Smart Citation

On the in situ estimation of surface acoustic impedance in interiors of arbitrary shape by acoustical inverse methods

Nava

Yasuda

Sato

et al. 2009

Acoust. Sci. & Tech.

View full text Add to dashboard Cite

A method for in situ estimation of the acoustic impedance of surfaces in interiors is introduced in this paper. The key difference with traditional in situ measurement techniques is the use of an inverse acoustic boundary framework which allows us to overcome some geometry constraints from previous methods (such as the planar-surface requirement and placement of microphone arrays). Furthermore, estimation of the acoustic impedance of not only one but all the surfaces is possible provided that local reaction is the predominant effect, and the following parameters are known: geometry of the surfaces, sound pressure at a number of arbitrary points in the interior field and the strength of the sound source. The estimation of the acoustic impedance at each surface is achieved by the solution of an optimization problem formulated from the linear equations of the boundary element method (BEM) applied to the discretized interior boundaries of an interior space. Previous work on similar methods have reported examples with numerical simulations. The work in this paper goes further and numerical examples together with results obtained with experimental data are presented.

show abstract

Section: Iterative Estimation Of the Acoustic Impedancesmentioning

confidence: 99%

“…The near-field acoustic holography (NAH) is the most representative technique in this context (e.g. [7][8][9]). On the other hand, scarce work in this context has been done for the in situ measurement of acoustic impedance.…”

Section: Introductionmentioning

confidence: 99%

On the in situ estimation of surface acoustic impedance in interiors of arbitrary shape by acoustical inverse methods

Nava

Yasuda

Sato

et al. 2009

Acoust. Sci. & Tech.

View full text Add to dashboard Cite

show abstract

“…15 In 2000, the noise source was located in cabin using BEM near field acoustic holography by Williams. 16 In 2003, sound field separation technique was researched to extend the application range using double plane array to obtain sound pressure by Yu Fei. 17,18 In 2006, the method of extended SONAH was used to locate the noise source in vehicle cabin by Hald.…”

Section: Introductionmentioning

confidence: 99%

Combined Method of Near Field Acoustic Holography and Focused Beamforming for Noise Source Identification in Enclosed Space

Zhang¹,

Jia²,

Yang³

et al. 2017

IJAV

View full text Add to dashboard Cite

Noise control of vehicle cabins has been given high consideration owing to the increasing demands for comfort of ship vehicles. Noise source identification is the precondition of noise control. Conventional methods of noise source identification are mainly applied in free fields. The performance of noise source identification methods will be seriously decreased in enclosed space due to the effect of sound reflection. Noise source identification in enclosed space based on double cylindrical array is researched in this paper. The effect of reflection sound is removed by using the sound field separation technique. The combined method of near field acoustic holography and focused beamforming for noise source identification is proposed to identify noise sources having high and low frequencies. The performance of the proposed method is studied by simulation, and the experiment is carried out in the submarine cabin model to verify the feasibility of the proposed method. The researching results shows that the effect of reflection sound can be removed using sound field separation technique based on double cylindrical array, and the high-resolution identification for high and low frequency signals can be obtained using the combined method of near field acoustic holography and focused beamforming.

show abstract

“…Until recently, the use of array measurement techniques inside of aircraft has mainly been limited to strongly correlated or easily referenced sources such as propeller driven aircraft. 1 The difficulties in using array techniques inside of jet aircraft can be attributed to channel count, source type, the interior acoustic field, and area of coverage.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Source Localization in Aircraft Interiors Using Microphone Array Technologies

Sklanka

Tuss

Buehrle

et al. 2006

12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference)

View full text Add to dashboard Cite

Using three microphone array configurations at two aircraft body stations on a Boeing 777-300ER flight test, the acoustic radiation characteristics of the sidewall and outboard floor system are investigated by experimental measurement. Analysis of the experimental data is performed using sound intensity calculations for closely spaced microphones, PATCH Inverse Boundary Element Nearfield Acoustic Holography, and Spherical Nearfield Acoustic Holography. Each method is compared assessing strengths and weaknesses, evaluating source identification capability for both broadband and narrowband sources, evaluating sources during transient and steady-state conditions, and quantifying field reconstruction continuity using multiple array positions.

show abstract

Interior near-field acoustical holography in flight

Cited by 91 publications

References 12 publications

On the in situ estimation of surface acoustic impedance in interiors of arbitrary shape by acoustical inverse methods

On the in situ estimation of surface acoustic impedance in interiors of arbitrary shape by acoustical inverse methods

Combined Method of Near Field Acoustic Holography and Focused Beamforming for Noise Source Identification in Enclosed Space

Acoustic Source Localization in Aircraft Interiors Using Microphone Array Technologies

Contact Info

Product

Resources

About