Vol. 7, No. 2, pp. 182-191 (2011)
THE APPLICATION OF A HHT BASED ULTRASONIC
DETECTING METHOD IN QUALITY ASSESSMENT OF CFST
Fu-xiang Ye1, Xiao-xiong Zha2,*and Hong-xin Wang3
1 Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
2 Professor, Department of Urban and Civil Engineering, Shenzhen Graduate School,
Harbin Institute of Technology, China
3 PhD Candidate, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Received: 14 October 2010; Revised: 21 November 2010; Accepted:26 November 2010
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ABSTRACT
Owed to the features of concrete and concrete pumping construction craft, empty holes, osteoporosis, construction joints and poor cementation often appear inside CFST. In view of this situation, ultrasonic detecting method has been developed to assess the quality of CFST. However, traditional methods are limited because of the effect of noise signal and distortion of signal. In this paper, the filtering process and HHT were applied to the ultrasonic signal received, and the Hilbert energy spectrum and the first-order intrinsic mode function were used to assess the quality of CFST. Actual testing results show that the HHT analysis method, combined with filtering process, can effectively improve the identification of the arrival time, the amplitude value, the waveform and the frequency of the first wave of the ultrasonic signal, and thus improve the damage identification quality of CFST.
KEYWORDS
Hilbert-Huang transform; hilbert energy spectrum; ultrasonic detecting; bandpass digital filter; CFST
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