Sensitivity Study of Control Parameters during Underway Replenishment Simulations Including Approximate Nonlinear Sea Effects.

Abstract

This report describes the fourth phase of the development of a hybrid computer simulation of two ships during underway replenishment (UNREP) operations. Emphasis was placed on performing sensitivity analysis of the maneuvering control parameters. Some approximate nonlinear sea state excitations acting on the ships' hulls due to a specific irregular sea were added to the simulation model. The mathematical model for both the nonlinear force and moment excitations was developed by using the Volterra Series mathematical formalism. The forces and moments were represented during the simulation by time series. The sea state was defined in the UNREP simulation by the Pierson-Moskowitz Spectra. The simulation incorporating some approximate nonlinear sea state excitations, together with an automatic controller on each ship, was used for control variable sensitivity studies.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1977
Accession Number
ADA036353

Entities

People

  • Reidar Alvestad
  • Samuel H. Brown

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Computational Science
  • Computer Programs
  • Computer Simulations
  • Computers
  • Coordinate Systems
  • Engineering
  • Engineers
  • Equations
  • Hybrid Computers
  • Mathematical Models
  • Mechanical Engineering
  • Model Tests
  • Naval Architecture
  • Propeller Shafts
  • Ship Models
  • Ships
  • Transfer Functions

Readers

  • Calculus or Mathematical Analysis
  • Naval Architecture and Marine Engineering.
  • Robotics and Automation.