Accession Number:

ADA188016

Title:

Prediction of SWATH Cross-Structure Slamming Pressures

Descriptive Note:

Research and development rept.

Corporate Author:

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

Personal Author(s):

• Zarnick, Ernest E.

Report Date:

1987-09-01

Pagination or Media Count:

22.0

Abstract:

Measurements of cross-structure impact pressures and relative motions between the free surface and the structure at the point of impact on a 122 scale SWATH T-AGOS model were analyzed to determine whether these parameters could lead to procedures for estimating the pressures from ship motion calculations. Although, the impact pressure, in general, increased with the square of the relative velocity the data showed considerable scatter when plotted in this format. Including the effects of the angle of the free surface at the point of impact in the analysis did not improve the correlation. If it is assumed that the rms pressure is proportional to the mean squared relative velocity and that the probability distribution is exponential, then slamming characteristic of the SWATH ship can be estimated from ship motion computations. The former assumption requires further experimental verification.

Descriptors:

• *SHIP MOTION
• *SLAMMING
• COMPUTATIONS
• IMPACT
• MOTION
• MATHEMATICAL PREDICTION
• PRESSURE
• SHIP MODELS
• SHIP HULLS
• SHIP STRUCTURAL COMPONENTS
• LOAD DISTRIBUTION
• VELOCITY
• PRESSURE MEASUREMENT

Subject Categories:

• Marine Engineering
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE