SLECTION OF WAVELET FUCTION ON DENOISE QULITIES OF ULTRASONIC INSPECTION SIGNAL

被引：0

作者：

Zhang, Wei-wei ^{[1
,2
]}

Ma, Hong-wei ^{[1
,2
]}

Wang, Zhi-hua ^{[3
]}

机构：

[1] Jinan Univ, Minist Educ China, Dept Civil Engn & Mech, West 601,Huangpu Rd, Guangzhou 510632, Guangdong, Peoples R China

[2] Jinan Univ, Minist Educ China, Key Lab Disaster Forecast & Control Engn, West 601,Huangpu Rd, Guangzhou 510632, Guangdong, Peoples R China

[3] Taiyuan Univ Technol, Inst Appl Mech, Taiyuan 030024, Peoples R China

来源：

PROCEEDINGS OF THE 2008 SYMPOSIUM ON PIEZOELECTRICITY, ACOUSTIC WAVES AND DEVICE APPLICATIONS | 2008年

关键词：

Damage detection; pipe; wavelet; crack;

D O I：

暂无

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

It is suggested in this paper to denoise the ultrasonic inspection signals using wavelet transform. The theoretic base is that wavelet transform is a band-pass filter. Firstly, the frequencies of the inspection signal are evaluated according to the excited signal. Secondly. an appropriate scale for wavelet transform is computed following the laws between the scale and the frequency. Thirdly, wavelet transform with the scale would be operated. As results, the echoes by the flaws could be discerned in the wavelet coefficients. Finally, the propagation of the guided wave in a damaged pipe is simulated by code ANSYS and the signal processing are operated by code MATLAB. The different wavelet functions are also discussed aiming at the denoised qualities. The signal-to-noise ratio (SNR) is used to evaluate the quality for different wavelet. It Could be concluded that the Morlet wavelet is suitable to operate the ultrasonic inspection signal excited by a sinusoidal signal modulation by Harming windows.

引用

页码：119 / +

页数：2

共 3 条

[1] Application of the spatial wavelet transform and Bayesian approach to the crack detection of a partially obstructed beam
Lam, HF
Lee, YY
Sun, HY
Cheng, GF
Guo, X
[J]. THIN-WALLED STRUCTURES, 2005, 43 (01) : 1 - 21
[2] Crack detection in beams by wavelet analysis of transient flexural waves
Tian, JY
Li, Z
Su, XY
[J]. JOURNAL OF SOUND AND VIBRATION, 2003, 261 (04) : 715 - 727
[3] APPLICATION OF ORTHOGONAL WAVELETS TO EARLY GEAR DAMAGE DETECTION
WANG, WJ
MCFADDEN, PD
[J]. MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 1995, 9 (05) : 497 - 507

← 1 →