Accession Number:

ADA058517

Title:

Landing Vehicle Assault (LVA) Motion Characteristics in Oblique Seas and Coastal Swells

Descriptive Note:

Final rept.

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT

Personal Author(s):

Report Date:

1978-01-01

Pagination or Media Count:

54.0

Abstract:

Model experiments were conducted to investigate the seakeeping characteristics of a heavily loaded 55,000 lb. Landing Vehicle Assault LVA planing hull. The vehicle under consideration has a flat-bottomed, zero deadrise angle planing surface with an adjustable full span transom stern flap and optional chine flaps. Experiments on the free-running 112 scale model, both with and without chine flaps were conducted at various speeds in simulated oblique irregular sea and coastal swell conditions. The intent of the investigation was to determine the craft habitability and safety of personnel as well as craft controllability. This information is presented herein in terms of wave induced craft vertical accelerations in standard one-third octave frequency bands. Additional plots are given for pitch, heave and roll accelerations. Vehicle responses to a 10 second period full scale swell are given in tabular form as acceleration transfer functions. Vertical acceleration levels at the bow and LCG were compared with MIL standards for maintaining personnel proficiency for one-hour. The results generally indicate the LVA accelerations to be within or at least marginally within acceptable levels. Some exceptions, particularly at the crafts bow, were noted in head and bow waves.

Subject Categories:

  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE