Investigation of a Nonlinear Application of the Navy's Dynamic Design Analysis Method for Sound Isolated Equipment.

Abstract

The Navy's dynamic design-analysis method (DDAM) is used to predict the peak forces and the deflections expected in items of equipment on combat ships subjected to underwater-explosion attacks. The DDAM cannot be applied directly to sound-isolated equipment because of the nonlinearity in the mounting. A method of linearizing the nonlinear elements of a structure by iterative analysis is described. The average elements are continuously adjusted during the iterative analysis until convergence occurs by matching peak forces and deflections of the nonlinear elements. Trial analyses on a structure consisting of a pair of beams with four or five nonlinear elements show that the method converges within a reasonable number of iterations. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 28, 1981
Accession Number
ADA104413

Entities

People

  • W. W. Webbon

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Accuracy
  • Computer Programs
  • Computers
  • Convergence
  • Deflection
  • Differential Equations
  • Dynamic Response
  • Equations
  • Frequency
  • Mathematical Models
  • Modal Analysis
  • Navy
  • Nonlinear Systems
  • Procedures (Computers)
  • Resonant Frequency
  • Stiffness
  • Underwater Explosions

Fields of Study

  • Engineering

Readers

  • Naval Architecture and Marine Engineering.
  • Operations Research
  • Structural Dynamics.