Inverse problem for the geometry profile determination of waveguides with varying section using adiabatic behavior of guided waves

Kettani, Mounsif Ech Cherif El; Marical, P.; Hamitouche, Zahia

doi:10.1109/tuffc.2009.1279

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…The measurement of the spatial variations of the wavenumber has been proposed to reconstruct the profile variation de(x) of the waveguide in case of moderate dispersion. 45…”

Section: Adiabatic Conditionmentioning

confidence: 99%

Measuring the wavenumber of guided modes in waveguides with linearly varying thickness

Moreau

Minonzio

Talmant

et al. 2014

The Journal of the Acoustical Society of America

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Measuring guided waves in cortical bone arouses a growing interest to assess skeletal status. In most studies, a model of waveguide is proposed to assist in the interpretation of the dispersion curves. In all the reported investigations, the bone is mimicked as a waveguide with a constant thickness, which only approximates the irregular geometry of cortical bone. In this study, guided mode propagation in cortical bone-mimicking wedged plates is investigated with the aim to document the influence on measured dispersion curves of a waveguide of varying thickness and to propose a method to overcome the measurement limitations induced by such thickness variations. The singular value decomposition-based signal processing method, previously introduced for the detection of guided modes in plates of constant thickness, is adapted to the case of waveguides of slowly linearly variable thickness. The modification consists in the compensation at each frequency of the wavenumber variations induced by the local variation in thickness. The modified method, tested on bone-mimicking wedged plates, allows an enhanced and more accurate detection of the wavenumbers. Moreover, the propagation in the directions of increasing and decreasing thickness along the waveguide is investigated.

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“…The measurement of the spatial variations of the wavenumber has been proposed to reconstruct the profile variation de(x) of the waveguide in case of moderate dispersion. 45…”

Section: Adiabatic Conditionmentioning

confidence: 99%

Measuring the wavenumber of guided modes in waveguides with linearly varying thickness

Moreau

Minonzio

Talmant

et al. 2014

The Journal of the Acoustical Society of America

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“…属于强变形冰, 水平与垂向尺度上的变化范围均可达波长的数倍, 多见于海冰相互挤压、堆叠所形成的冰脊 [96] . Marical等 [97,98] 比即可反演冰厚等声参数. 1954年, Oliver等 [99] 通过北冰洋波弗特海冰中测得的弯曲波和空气耦合弯曲波频散曲线推测冰厚, 但其结果的误差较大.…”

Section: 冰声参数选取unclassified

Review on modeling polar sea-ice acoustics waveguide

Yin¹,

Ma²,

Zhang³

et al. 2022

Acta Phys. Sin.

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With the continued global warming, polar science has become one of the research hotspots. Regarding polar acoustics, much progress has been made due to the efforts made by scientists in the world. With the enhancement of stereoscopic monitoring capacity in polar regions, the acoustic theory and technologies applicable to Arctic sea-ice, which have long been overlooked as a branch of acoustics, are now dawning more and more attention. The propagation of elastic waves in the Arctic sea-ice is governed by its waveguide, and the understanding of which faces a grave challenge due to the unique material properties and complex internal structure of sea-ice, along with the asymmetric fluid-solid coupling at its boundaries and the inaccessibility for in-situ experiments, which is caused by the extreme condition. Aiming at an effectively and precisely modeling technique of acoustic propagation in sea-ice, including its waveguide, in this paper, the progress, the development, and the status of corresponding researches are reviewed. For a better understanding of the modeling of sea-ice, Arctic sea-ice, i.e. its formation condition, geometries, mechanical properties, microstructures, and the acoustic propagation, is briefly introduced. Different approaches to modeling the propagation of elastic waves in ice-floe based on explicit/implicit boundary conditions are presented and explained in detail. The resulting transcendental characteristic equation describing the acoustic propagation needs to be solved in a complex space for the severe energy leakage at the water-ice interface, and the necessary numerical methods of solving this equation are then explained and compared with each other. Since accurate parameters are imperative in having a satisfactory fidelity for any physical model, the acoustic parameters of Arctic sea-ice, historical evolution and experimental results, along with its assessment techniques are also presented, and a set of sound velocity parameters of Arctic sea-ice are provided for modeling. The roughness of the ice-water interface is discussed case-by-case depending on its spatial scale in comparison with acoustic wavelength for its influence on the elastic waveguide. The perspectives and potential applications of the sea-ice acoustic waveguide within the frame of promoting sustainable development of the polar region are also discussed.

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