A signal processing approach to detect unknown pile length

Sheng Huoo Ni, Ji Lung Li, Yu Zhang Yang, Zih Tong Yang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Non-destructive testing (NDT) has been used widely for the testing of pile quality, especially in low-strain testing methods, e.g. the sonic echo test, the impulse response method, etc. The length of a long pile is often difficult to be evaluated correctly due to the fact that the energy of a reflected stress wave generally fades with the wave travel path during the testing. The purpose of this paper is to study using a signal processing approach to detect unknown pile length, especially for a long pile. This approach successfully utilized the amplitude and phase message of a complex continuous wavelet transform to determine the pile length of the pile by analyzing a time-frequency-phase angle diagram in the different frequency band. Two long drilled piles were installed and tested to verify the proposed approach in this study. The testing results show that a complex continuous wavelet transform is able not only to provide high-resolution results in different frequency bands but can also simplify the identification of the reflection signal of the pile tip using three-dimensional phase angle spectrogram. The length of the pile can then be easily calculated using the time of wave traveling from the pile top to the pile tip.

Original languageEnglish
Title of host publicationProceedings of the 27th International Ocean and Polar Engineering Conference, ISOPE 2017
PublisherSociety of Petroleum Engineers
Pages679-684
Number of pages6
ISBN (Electronic)9781880653975
Publication statusPublished - 2017
Event27th International Ocean and Polar Engineering Conference, ISOPE 2017 - San Francisco, United States
Duration: 2017 Jun 252017 Jun 30

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Other

Other27th International Ocean and Polar Engineering Conference, ISOPE 2017
CountryUnited States
CitySan Francisco
Period17-06-2517-06-30

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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