Correcting a Significant and Consistent Error in the Modal Damping Obtained using Transient Vibration Data

Abstract

This report investigates the experimental vibration technique of impact excitation when used to obtain frequency response functions. It is shown that current practices introduce a consistent error in the derived modal damping estimates. The error can be significant, with levels of damping being wrongly predicted by a factor of three or more. The report identifies the source of the error. It then derives and presents a simple correction to be applied to the observed modal damping estimates. The procedure is demonstrated by experiment.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1998
Accession Number
ADA359146

Entities

People

  • Colin P. Ratcliffe

Organizations

  • Colorado State University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Analyzers
  • Bandwidth
  • Broadband
  • Data Sets
  • Diameters
  • Engineering
  • Frequency
  • Frequency Bands
  • Frequency Domain
  • Frequency Response
  • Mechanical Engineering
  • Modal Analysis
  • Resonant Frequency
  • Spectrum Analyzers
  • Test Methods
  • Time Domain
  • United States Naval Academy

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Control Systems Engineering.
  • Life Cycle Cost Analysis