Energy Loss in Surface Wave Spectra Due to Data Windowing

Abstract

Windowing or tapering of surface-wave time-series is often performed prior to spectral analysis. The loss of variance due to the windowing is theoretically a factor of 8/3 (for cosine windows), but this factor may vary in practice due to the non-white nature of wave spectra. A numerical experiment on 101 wave spectra has shown that although 8/3 is a good correction factor in the mean, corrections on individual records may vary from less than 2 to almost 4.3. Since rarely in geophysical studies are sufficient records available to allow one to approach some theoretical value in the mean, i.e. 8/3, correction of individual records is recommended.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1972
Accession Number
AD0742845

Entities

People

  • Melbourne G. Briscoe

Organizations

  • SACLANT ASW Research Centre

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Abstracts
  • Alloys
  • Carbon Steels
  • Frequency
  • Frequency Domain
  • High Temperature
  • Hot Working
  • Iron
  • Iron Alloys
  • Low Alloy Steels
  • Mechanical Properties
  • Mechanical Working
  • Metals
  • Nato
  • Notch Sensitivity
  • Steel
  • Surface Waves

Readers

  • Approximation Theory.
  • Regression Analysis.
  • Seismology