Combined Direct-Adjoint Approximations for Large-Scale Design-Oriented Structural-Acoustics Finite-Element Analysis

Abstract

A second-order approximation method was developed for the design- oriented analysis and sensitivity approximations of large scale structural/acoustic problems. The method is based on combined utilization of low-order approximations of both direct and adjoint problems. A variety of approximation techniques for the first-order model order reduction of the direct and adjoint structural acoustic problems were tested. The overall consistent accuracy level of the second order method over wide frequency ranges and large variations of systems parameters was demonstrated.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2004
Accession Number
ADA430214

Entities

People

  • Eli Livine
  • Levent Coskuner

Organizations

  • University of Washington

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Acoustics
  • Air Force
  • Bending Moments
  • Computational Fluid Dynamics
  • Computational Science
  • Crystal Lattice Vibrations
  • Differential Equations
  • Equations
  • Euler Equations
  • Finite Element Analysis
  • Frequency
  • Frequency Bands
  • Frequency Domain
  • Frequency Response
  • Structural Components
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Systems Analysis and Design