Development of a Stress Transfer Function for an Idealised Helicopter Structure

Abstract

This report presents an investigation of the effects that may have an influence on the development of a linear stress transfer function (STF) relating the stress in dynamic components to the stress in static components. Effects such as buckling, non-uniqueness, vibration, and solution procedure are considered. Two procedures for determing the STF are compared, one termed the vector procedure and the other the matrix procedure. A simple two dimensional truss, which models an idealised helicopter structure, is constructed to numerically simulate the development of a STF. Using random inputs the resulting stresses are evaluated exactly. Noise is then added to both the input loads and output stresses to develop a noisy data set. Using this noisy data set, STFs are developed using both the vector and matrix techniques. The vector procedure is shown to be sensitive to collinearity in the input, while the matrix technique is found to be more stable under the same ill-conditioning.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2000
Accession Number
ADA377442

Entities

People

  • Frank G. Polanco

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Air Platforms
  • Biomedical

DTIC Thesaurus Topics

  • Accuracy
  • Aircrafts
  • Airframes
  • Australia
  • Birds
  • Data Sets
  • Engineering
  • Fatigue Life
  • Fixed Wing Aircraft
  • Geometry
  • Helicopters
  • Physical Properties
  • Resonant Frequency
  • Structural Components
  • Transfer Functions
  • Two Dimensional
  • Vibration

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Nanocomposite Materials Science
  • Structural Dynamics.