Predicting the acoustic response of complicated targets in complicated environments using a hybrid finite element/propagation model

Le résumé fourni par la source

Previous work has shown that hybrid finite element (FE)/propagation models are a viable tool for estimating the Target-In-The-Environment-Response, or TIER, for simple shapes such as cylinders and pipes on a flat, undisturbed sand/water interface [K. L. Williams et al., J. Acoust. Soc. Am 127, 3356–3371 (2010)]. Here we examine their use for more complicated targets located in complicated ocean environments. The targets examined include various munitions and ordnance-like targets, with intricate internal structure and filled with either air or water. A hybrid FE/propagation model is used to predict their TIER on flat, undisturbed sand. Data acquired during the target portion of TREX13 is used to validate the model results. Next, the target response is investigated in a more complicated environment, being partially buried with their axis tilted w.r.t. the flat sand interface. Again model results are validated using TREX13 data, as well as data acquired in a controlled tank experiment. These comparisons highlight the feasibility of using hybrid models for complex target/environment configurations, as well possible limitations due to the effects of multiple scattering.

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