Acoustic Modeling in Environments with a Dynamic Sea-Surface
Abstract
"This research considers modeling ocean acoustic propagation in environments where signals bounce off a moving, rough sea-surface (i.e., dynamic surface). The significance of this new model is the extension beyond most modeling approaches that treat the surface as either smooth or as rough but frozen (i.e., static surface).Here, the sea-surface wave motion is included and this has implications for a variety of systems including thosefor acoustic communications or active sonars that use long duration transmissions. The preliminary work for aFinite-Difference-Time-Domain (FDTD) model has been developed but there are several steps needed to make this a practical and validated tool for typical ocean acoustics applications. This includes adding a seabed boundary to the model and shifting to a cylindrical coordinate geometry that will allow for a point source versus the current line source implementation. FDTD has had limited use in ocean acoustics primarily because the added value has not usually outweighed the large computational load. Here, the feasibility of implementing the model with Cloud Computing is considered and initial results indicate several orders of magnitude improvement in computation time are possible. This may have far-reaching implications not only for FDTD but also for other ocean acoustic modeling approaches."
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 05, 2021
- Source ID
- N000142112317
Entities
People
- Martin Siderius
Organizations
- Office of Naval Research
- Portland State University
- United States Navy