Acoustic beamforming through a thin plate using vibration measurements

Leclère, Quentin; Picard, Christophe

doi:10.1121/1.4921272

Cited by 4 publications

(3 citation statements)

References 15 publications

(12 reference statements)

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“…In addition to loading identification problems, the force analysis technique was extended to identify mechanical parameters such as Young's modulus or the structural loss factor (Ablitzer et al, 2014). Another use of this technique was suggested by (Leclère and Picard, 2015). In their work, a loudspeaker to be localized was placed in a semi-anechoic room, this room being coupled to a reverberant room.…”

Section: Introductionmentioning

confidence: 99%

Space-time reconstruction of a moving acoustic loading on a membrane by coupling the force analysis technique and full-field non-contact vibration measurements

Mougey,

Robin,

Melon

2024

Front. Acoust.

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Identifying acoustical and mechanical loadings on structures is a common problem in acoustics and vibration analysis and stationary loadings are mostly considered on plate-like structures. This work describes a proof of concept for reconstructing the trajectory of an acoustic source moving in front of a membrane. Compared with works focusing on precisely identifying a loading’s amplitude at a given location, the objective is to reconstruct the loading’s trajectory–Qualitative loading identification is sought rather than quantitative. The force analysis technique is used to recover a space-time varying loading on a structure, starting from time-resolved full-field non-contact vibration measurements conducted on a circular membrane. At the same time, a compact and tonal sound source is used to draw freehand shapes in front of the membrane. The loading trajectory, therefore, contains information that was “acoustically written”. Simple hand gestures that correspond to the drawing of a Greek letter (Σ), a capital letter (P), two shapes (♡, ⋆), and a 3-letter word (net) are recovered using the proposed procedure. The effect of various parameters on the reconstructed information is studied. Perspectives in terms of possible research areas and applications are finally discussed. These perspectives include, for example, the use of membranes to help reconstruct complex and space-time-varying loadings or even applications in musical acoustics on membranophones.

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Section: Introductionmentioning

confidence: 99%

Space-time reconstruction of a moving acoustic loading on a membrane by coupling the force analysis technique and full-field non-contact vibration measurements

Mougey,

Robin,

Melon

2024

Front. Acoust.

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“…Another alternative might be the use of a vibrating structure (e.g. an thin plate) equipped with accelerometers [19]. It has been shown that the structure acts as a low-pass filter in the wavenumber domain, thus filtering out components with high wavenumbers associated to flow-induced noise.…”

Section: Introductionmentioning

confidence: 99%

A probabilistic approach for cross-spectral matrix denoising: Benchmarking with some recent methods

Dinsenmeyer

Antoni

Leclère

et al. 2020

The Journal of the Acoustical Society of America

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Array measurements can be contaminated by strong noise, especially when dealing with microphones located near or in a flow. The denoising of these measurements is crucial to allow efficient data analysis or source imaging. In this paper, a denoising approach based on a Probabilistic Factor Analysis (PFA) is proposed. It relies on a decomposition of the measured cross-spectral matrix (CSM) using the inherent correlation structure of the acoustical field and of the flow-induced noise. This method is compared with three existing approaches, aiming at denoising the CSM, without any reference or background noise measurements and without any information about the sources of interest. All these methods make the assumption that the noise is statistically uncorrelated over the microphones, and only one of them significantly impairs the off-diagonal terms of the CSM. The main features of each method are first reviewed, and their performances are then evaluated by way of numerical simulations along with measurements in a closed-section wind tunnel.

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“…On the other hand, the CFAT method has been recently implemented for beamforming applications based on vibration measurements. 10 The parietal acoustic field exciting a baffled plate is identified from vibration measurements (using CFAT), and then used as an input for standard beamforming codes. The approach has been validated experimentally for a pure acoustic load (without flow).…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Validation of an Array of Accelerometers for In-flow Acoustic Beamforming Applications

Leclère

Chéron

Pereira

et al. 2016

22nd AIAA/CEAS Aeroacoustics Conference

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The aim of this work is to present an experimental validation of inflow beamforming using vibration measurements. An antenna of accelerometers is mounted on a thin structure placed in the flow. High wavenumbers of the turbulent boundary layer are naturally filtered out by the structure, such that accelerometers are mainly dominated by the acoustic part of the excitation. An inverse method is used to reconstruct the pressure exciting the structure from vibration measurements, that is then injected in a beamforming code. The experiment shows the ability of the inverse method to reconstruct the acoustic part of the excitation, and validates the possibility to use it for acoustic source localisation.

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Acoustic beamforming through a thin plate using vibration measurements

Cited by 4 publications

References 15 publications

Space-time reconstruction of a moving acoustic loading on a membrane by coupling the force analysis technique and full-field non-contact vibration measurements

Space-time reconstruction of a moving acoustic loading on a membrane by coupling the force analysis technique and full-field non-contact vibration measurements

A probabilistic approach for cross-spectral matrix denoising: Benchmarking with some recent methods

Design and Experimental Validation of an Array of Accelerometers for In-flow Acoustic Beamforming Applications

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