The Ship Response Tactical Decision Aid. Phase 1
Abstract
The Ship Response Tactical Decision Aid (SRTDA) is a seakeeping tool that will provide advisories on ship speeds and headings to optimize operations and minimize casualties during the conduct of evolutions which become hazardous in heavy seas. The SRTDA is under development in two phases. Phase I is presently being transitioned to fleet use under the Tactical Environmental Support System Program (TESS). Contours of ship motion in the form of polar plots which display heave, pitch, and roll are displayed with visual observations of sea conditions as program input. One validation trial has been performed. Ship motions were measured and compared to values predicted by the SRTDA which varied with the source of wave data. Predicted motions were made with visual observations, wave buoy measurements and SPS-10 radar measurements. The SPS-10 did not have the capability to provide wave height, therefore the buoy-measured wave height was used in the radar wave measurement. Buoy and radar measured wave inputs to the SRTDA consistently provided motion predictions that were in better agreement with measured motions than did observed wave data. Motion predictions, based on observations were consistently less than the real time motion measurements. The mean difference between measured and predicted motion was generally less than + or - 20% for the buoy and the radar measured wave inputs. A more sophisticated SRTDA is currently being developed. This incorporates input of a directional spectrum of waves based on measurements by a ship's SPS-64 radar. A level of operability of the ship's system is displayed for a range of headings and speeds, given the sea conditions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1989
- Accession Number
- ADA216313
Entities
People
- R. J. Bachman
- W. L. Thomas Iii