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Acoustic scattering from a solid aluminum cylinder in contact with a sand sediment: Measurements, modeling, and interpretation

Acoustic scattering from a solid aluminum cylinder in contact with a sand sediment: Measurements, modeling, and interpretation,10.1121/1.3419926,Journ

Acoustic scattering from a solid aluminum cylinder in contact with a sand sediment: Measurements, modeling, and interpretation   (Citations: 5)
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    • ...We caution readers, however, that even for objects as simple as a tilted cylindrical shell or a tilted solid metal cylinder in water prominent features attributable to the elasticity of the cylinder can be present in the backscattering for frequencies far in excess of ka = 15 where k = 2! f/c is the wavenumber in water and a is the radius of the cylinder and c is the speed of sound in water [2-4]...
    • ...The backscattering frequency response of a solid aluminum cylinder placed proud on sand was recently investigated as a function of the orientation of the cylinder [4]...
    • ...Though it is not central to the present paper, it is noteworthy that quantitative ray theory for the scattering contribution by SEW has been extended to a range of scattering situations where benchmark solutions were not available prior to the development of computationally based finite-element methods (FEM) for the scattering by truncated objects in water [4]...
    • ...These methods have even been helpful for interpreting features in the observed scattering for cylinders located on sand and for a variety of laboratory experiments including bistatic scattering [2-7, 15]...
    • ...The details of these types of experiments can be found in [4]...
    • ...Once an individual target is isolated, subsequent processing as described in [4] allows one to produce the target strength of each target as a function of frequency and azimuthal angle...
    • ...This triplet structure has been explained in [4] as due to four separate backscattering paths; a direct path from the source to the cylinder and back to the receiver, two paths that include a single bounce off the sand either before or after scattering from the cylinder (that arrive simultaneously), and a path that included a bounce off the sediment both before and after scattering from the cylinder...
    • ...Finite element results for the proud aluminum cylinder were described in [4]...
    • ...The single bounce paths are actually bistatic (cf. [4]) and thus have a different character...

    Timothy M. Marstonet al. Scattering resonances, filtering with reversible SAS processing, and a...

    • ...A detailed drawing and aerial view of the pond can be found in [5]...
    • ...Fig. 2. Divers first deployed a 21 m long rail system, which consists of three independent sections (see Fig. 1 in [5])...
    • ...Figure 3(a) in [5] is a SAS image of the same solid aluminum cylinder obtained in the previous year’s PondEx09 measurement, and it is similar to Fig. 4(b) shown here...
    • ...Williams et al. developed an acoustic ray model (see Fig. 5 in [5]) to understand the observed triplet structure...
    • ...Based on the results of Williams et al. and Bucaro et al., it is anticipated the observed differences are associated with the elastic response of the target [4], [5]...

    Steven G. Karglet al. Acoustic response of unexploded ordnance (UXO) and cylindrical targets

    • ...Recent experiments with solid aluminum cylinders proud on a sandy bottom display SAS images containing both specular reflection contributions and elastic features [1]...

    Grant C. Eastlandet al. Evolution of acoustic feature timing and imaging for different cylinde...

    • ...A detailed aerial view of the test pond can be seen in [1]...
    • ...For a schematic of the rail, tower and array refer to [1]...
    • ...Since the FE domain is oriented with the pipe axis in line with the vertical z-axis as shown in Fig. 7, the second step consisted of performing a rotation of the domain so as to align the coordinate system of the FE results with the coordinate system of the pond experiments [1]...

    Aubrey L. Espanaet al. Measurements and modeling of the acoustic scattering from an aluminum ...

    • ...the farfield scattered response) with as much fidelity as possible [14],[15]...
    • ...Researchers who attempt to interpret the individual components of the response have focused on the model of the complete return [15]...

    Jack McLaughlin. Modeling acoustic target response by component

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