Non-Linear Effects in Aircraft Ground and Flight Vibration Tests,

Abstract

Examples of non-linear vibration behaviour in ground resonance tests of an aircraft are shown. Model tests for a simplified system with non-linear properties have been performed, to study the effects of friction and backlash with respect to ground resonance test and flight flutter test. With symmetric and asymmetric non-linear stiffness characteristics effects of amplitude dependent frequencies, mode coupling, mode asymmetries and the consequences in parameter identification in vibration tests are pointed out and discussed. In case of flutter critical modes and problems of apparent damping caused by non-linear system properties are shown and recommendations are given to reach a representative flutter clearance with respect to this non linear system behaviour. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1976
Accession Number
ADA034447

Entities

People

  • G. Haidl

Organizations

  • AGARD

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Aerodynamic Configurations
  • Aircrafts
  • Amplitude
  • Data Analysis
  • Dynamic Response
  • Excitation
  • Frequency
  • Friction
  • Linear Systems
  • Model Tests
  • Nato
  • Relative Motion
  • Resonance
  • Test And Evaluation
  • Test Methods
  • Wind Tunnel Tests
  • Wind Tunnels

Readers

  • Aerospace Test and Evaluation
  • Control Systems Engineering.