A signal processing approach to detect unknown pile length

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

研究成果: Conference contribution

摘要

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.

原文English
主出版物標題Proceedings of the 27th International Ocean and Polar Engineering Conference, ISOPE 2017
發行者Society of Petroleum Engineers
頁面679-684
頁數6
ISBN(電子)9781880653975
出版狀態Published - 2017
事件27th International Ocean and Polar Engineering Conference, ISOPE 2017 - San Francisco, United States
持續時間: 2017 六月 252017 六月 30

出版系列

名字Proceedings of the International Offshore and Polar Engineering Conference
ISSN(列印)1098-6189
ISSN(電子)1555-1792

Other

Other27th International Ocean and Polar Engineering Conference, ISOPE 2017
國家United States
城市San Francisco
期間17-06-2517-06-30

All Science Journal Classification (ASJC) codes

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

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