Accession Number:

ADA433927

Title:

Comparison of SWATH and Monohull Vessel Motion for Regional Class Research Vessels

Descriptive Note:

Technical rept.

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY

Report Date:

2005-05-01

Pagination or Media Count:

61.0

Abstract:

The attitude characteristics of two small research vessels, a 539-ton monohull RV Point Sur and a 419-ton SWATH RV Western Flyer, are compared. The comparison is based upon 134 61 motion measurements carried out on the RV Point Sur Western Flyer in 2003 and 2004. Measurements were made using a tilt meter and a vertical gyro. When the vessels were on station, root mean square roll on the RV Point Sur Western Flyer increased 0.23 0.12 degrees and pitch increased 0.12 0.06 degrees per foot of sea height for seas between two and twelve feet. Corresponding on-station rates of increase for vertical acceleration for the stern at the side were 0.18 msq s 0.03 msq s per foot for the RV Point Sur Western Flyer and reached g for the RV Point Sur for 15-ft. seas. Similar accelerations were observed at full speed when seas greater than 10 ft. were forward of the bow on the RV Point Sur. For RV Point Sur, observed directional response at full speed and pitch and roll damping were in good agreement with values obtained from tank tests in 1979.

Subject Categories:

  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE