Impact Echo Data Analysis Based on Hilbert–Huang Transform

Impact echo is an acoustic method based on the use of transient stress waves generated by an elastic impact; it is used for nondestructive testing of concrete structures. In practical applications, the signals obtained often are superimposed by further mechanical vibrations and the so-called geometry effects, which are caused mainly by surface waves. Because of attenuation in the concrete as well as the divergence of the acoustical waves, impact echo signals are transient. As a result, the frequency content changes over time. Normally the analysis is carried out on the Fourier power spectrum of the signal. However, the Fourier spectrum is still affected by the mentioned effects and has well-known deficiencies for short transient signals within longer time sweeps. Application of the Hilbert–Huang transform is presented as a refined method for the time–frequency analysis of nonstationary impact echo data. The basic properties of the method and its practical application for time–frequency analysis of impact echo data, signal filtering, and pattern identification are presented.

• Record URL:
  https://doi.org/10.3141/2028-16
• 
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=Impact+Echo+Data+Analysis+Based+on+Hilbert%e2%ac%1cHuang+Transform&author=D.+Algernon&author=H.+Wiggenhauser&publication_year=2007
• Availability:
  • Find a library where document is available. Order URL: http://www.trb.org/Main/Public/Blurbs/159728.aspx
• Authors:
  • Algernon, Daniel
  • Wiggenhauser, Herbert
• Publication Date: 2007

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References;
• Pagination: pp 146-153
• Monograph Title: Design of Structures 2007
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2028
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Acoustic waves; Concrete structures; Nondestructive tests; Pattern recognition systems; Signal processing
• Candidate Terms: Impact echo tests
• Identifier Terms: Hilbert-Huang transform
• Uncontrolled Terms: Time frequency analysis
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01045157
• Record Type: Publication
• ISBN: 9780309104555
• Files: TRIS, TRB, ATRI
• Created Date: Feb 8 2007 7:47PM