Acoustic interactions with submerged elastic structures. : by Hans A Bethe; A Guran; Herbert Überall; et al PDF

By Hans A Bethe; A Guran; Herbert Überall; et al

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Additional resources for Acoustic interactions with submerged elastic structures. : Part III, Acoustic propagation and scattering, wavelets, and time frequency analysis a Herbert Überall festschrift volume

Example text

C/tOMjan: 6. 6 RANGE (km) Figure 4c. Predicted propagation field by K R A K E N C for 25Hz signal. ' -) 0 70: *"^.... 6fJ^ ^^___^/ -50 ' 1 - '"^. ""- -. 6 RANGE: (*-) . 0 Figure 4d. Predicted propagation field by FEPES for 25Hz signal. a decibe] or two. In this case, S A F A R ] was closest to the measured data with K R A K E N C and FEPES off by a small amount. Figures 4 compare the propagation at 25Hz. In this case, the models compare slightly better against each other than against the measured data.

Coupled-mode models" are excluded from this study because they do not handle bottom elasticity. A ray-theory based model was developed and used for some of the low-frequency test case benchmarks''* proving that excellent agreement can be achieved with a ray-theory model in a low-frequency problem, but this model has not been generalized for more complicated waveguide problems. 2. 7. 67er:f In these comparisons, all dimensions and frequencies have been scaled by a factor of 1000 in order to feed the models with values in the typical ocean range and avoid possible numerical errors.

Source and receiver are at mid depth. 22 5. L. CZegg aftd J. Af. 5 kHz. for different wedge angies. O n e of the necessary assumptions of the theoretical derivation of Eq. (2) is the requirement for the wedge angte to be an exact submultiple of 7T. If this is not the case then the field diffracted by the wedge apex must be added to the modal field given by Eq. (6). 5°) (figure 17). Large variations in level (10 d B ) were found at fixed source and receiver positions, but on analysis these were consistent with a linear variation between the predicted levels at the two angles n/10 and n/8 for which the modal theory is exact.

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