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    A new signal energy-based approach to acoustic source localization in orthotropic plates: A numerical study

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    Author
    Sen, Novonil
    Kundu, Tribikram
    Affiliation
    Department of Civil and Architectural Engineering and Mechanics, University of Arizona
    Issue Date
    2022-05
    Keywords
    Acoustic source localization
    Objective function
    Orthotropic plates
    Sensors
    Signal energy-based approach
    
    Metadata
    Show full item record
    Publisher
    Elsevier BV
    Citation
    Sen, N., & Kundu, T. (2022). A new signal energy-based approach to acoustic source localization in orthotropic plates: A numerical study. Mechanical Systems and Signal Processing.
    Journal
    Mechanical Systems and Signal Processing
    Rights
    © 2022 Elsevier Ltd. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    A new easy-to-implement approach based on the energy of recorded signals is proposed to estimate the acoustic source location in orthotropic plates. The proposed approach (a) requires no time-of-arrival or time-difference-of-arrival estimates, (b) is free from the implicit assumption of the propagation of elastic wave energy along a linear path from an acoustic source to a sensor despite the material anisotropy and (c) can be applied without requiring any direct information on the mechanical properties of the plate material. It is demonstrated that a function of the signal energy at a sensor installed on an orthotropic plate can be modeled as a three-parameter function of the distance of the sensor from the source and its angular position with respect to the source. Considering the source coordinates and the three parameters as unknowns, this model leads to a nonlinear equation involving five unknowns. Considering several sensors, this results in a system of simultaneous nonlinear equations to be solved in the least squares sense by minimizing an objective function of five design variables to obtain an optimum source location estimate. Numerical validations of the proposed approach are performed via four numerical examples with varying plate boundary conditions and excitation pulses, as well as via another numerical example with a Gaussian noise (with a high enough signal-to-noise ratio) added artificially to the signals of one of the above examples. These illustrations reveal that in general the methodology yields sufficiently accurate estimates of the source location.
    Note
    24 month embargo; available online: 28 February 2022
    ISSN
    0888-3270
    DOI
    10.1016/j.ymssp.2022.108843
    Version
    Final accepted manuscript
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ymssp.2022.108843
    Scopus Count
    Collections
    UA Faculty Publications

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