Damping Estimation from Engine Data with Varying Natural Frequencies

Abstract

Damping from engine running data may be required for a variety of reasons including model validation, health monitoring, and general troubleshooting activities. The advantages of determining damping under realistic operating loads and boundary conditions are well known as are some of the difficulties involved. One such difficulty in gas turbine applications is that there may be significant natural frequency changes due to thermal and centrifugal-stiffening effects. This paper describes a novel technique which compensates for natural frequency changes and which may be used for both engine order and asynchronous (random) data. The method uses a variable carrier frequency modulation technique to effectively stationarize the data. The method and application to a simulated gas turbine example is described herein. The method is however completely general and may be useful in other applications.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 2005
Accession Number
ADA469547

Entities

People

  • Hilmi Kurt-elli

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Abstracts
  • Aircrafts
  • Bandwidth
  • Boundaries
  • Carrier Frequencies
  • Engines
  • Frequency
  • Gas Turbines
  • Modulation
  • Monitoring
  • Resonant Frequency
  • Sidebands
  • Spectra
  • Test And Evaluation
  • Turbines
  • Vehicles
  • Vibration

Readers

  • Radio communications and signal processing.
  • Systems Analysis and Design
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).