期刊论文

Wang Xianghong

英文

Applied Acoustics

0003-682X

2016

112

53-58

10.1016/j.apacoust.2016.05.003

The metal crack signal was produced by stretching Q235 steel (see Fig. 1), which is a commonly used material for key components of machinery and equipment. The signal was received according to ASTM Standard E569-02 Standard “Practice for Acoustic Emission Monitoring of Structures during Controlled Stimulation”. AE parameters and waveforms were recorded via a Physical Acoustics Corporation (PAC) PCI-II system. The PAC WD sensors (frequency range 100 kHz–1 MHz, resonance frequency 650 kHz) and 2/4/6

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Early crack signals in critical infrastructure components of major equipment are hardly to be extracted due to its low signal noise ratio (SNR). A de-noising method combined wavelet packet (WP) technology with sparse code shrinkage (SCS) is proposed in this study. Firstly, WP reconstruction technology is used to reserve the crack signal with a specified frequency range. That is, the signal is decomposed by Meyer wavelet into five layers, and the signal with the frequency range from 187.5 kHz to 609.375 kHz is reserved. Then SCS method removes n...