MODHLL: A Program for Modifying Computer Representations of Ship Hulls.

Abstract

Systematic series of hulls based on a present hull have long been used by naval architects and hydrodynamicists to determine the effects of hull form on flow and resistance. This memorandum describes an interactive computer program, MODHLL, which creates modified hulls from an existing parent hull. Although the parent hull requires a large data file for its definition, each modified hull is defined by only a few extra words of data since only the way it differs from the parent need be defined. Thus a whole series of hull forms may be defined using only a little extra storage space than the parent. The program is based on a generalization of Lackenby's method in which the hull is modified by moving the stations between the fore and aft perpendiculars. Each modified hull is specified by choosing values for the length, breadth, draft, depth and either the fore and the aft prismatic coefficients, or the total prismatic coefficient and the longitudinal centre of buoyancy. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1986
Accession Number
ADA176802

Entities

People

  • David Hally
  • Normand Gilbert

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • C4I
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Accuracy
  • Buoyancy
  • Cartesian Coordinates
  • Classification
  • Coefficients
  • Computer Programs
  • Computers
  • Coordinate Systems
  • Gaussian Quadrature
  • Graphics
  • Hulls (Marine)
  • Naval Architecture
  • Resistance
  • Security
  • Ship Hulls
  • Standards

Readers

  • Marine Hydrodynamics
  • Regression Analysis.

Technology Areas

  • Space