Comparison of Full-Scale and Rigid Vinyl Model Structural Responses for a Small Waterplane Area Twin Hull Craft (SSP KAIMALINO).
Abstract
The need to provide the technical experience necessary to determine loads criteria for Small Waterplane Area Twin Hull (SWATH) ship design led to a structural evaluation program of the SWATH prototype craft, SSP KAIMALINO, operated by the Naval Ocean Systems Center (NOSC) and a scaled rigid vinyl/fiberglass model. The experimental prototype and model were instrumented with strain, pressure, and accelerometer transducers. Static load evaluations were conducted on both to obtain a basis for comparison of prototype and rigid vinyl model responses and to obtain load per unit strain relationships. Prototype and model static strain data indicate that for the lower hulls and vertical struts agreement is good; for the upper hull, however, agreement is inconsistent and, at best fair. It is believed that simplifications made in scaling the model structure were responsible for these inconsistencies. Load/strain sensitivities developed from the static load evaluations are applied to strain data collected during sea trials to establish a trials derived loads data base. Estimates are then made of wave induced primary side loads for various sea states and headings. For a 20 year operational lifetime the maximum side loads are predicted to be approximately one-half the craft displacement. Agreement of the model and prototype based loads data is excellent and further validates rigid vinyl modeling as a design tool for estimating full-scale loads. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1981
- Accession Number
- ADA104308
Entities
People
- William H. Hay