Study on Magnetic Memory Testing Signal Characteristics of Pipeline Defects Based on Wavelet Packet Analysis
- 10.2991/icmmse-17.2017.71How to use a DOI?
- Magnetic Memory Testing, Signal characteristics, Stress Concentration, Defect, Wavelet packet energy spectrum.
At present, the judging principle of Magnetic Memory Testing technology (MMT) can only indicate the stress concentration zone, but can not get information from the stress concentration further. In the paper, to get information from the stress concentration zone, a MMT signal analysis method based on wavelet packet energy spectrum is proposed. The specimen tension load experiment shows that when the tension load is 200MPa, the signal wavelet packet energy spectrum distributes uniformly, the percentage of separate energy to total energy is lower than 15%. When the tension load is 410MPa, the maximum wavelet packet energy locate in 1, 3 and 4 spectrum, the percentage of 1~4 energy to total energy is 73.8%, and the main wavelet packet energy locates in the low frequency area. After the specimen yields, the maximum wavelet packet energy locates in 1 and 2 spectrum; the percentage of 1~3 energy to total energy is 87.3%.The distribution of wavelet packet energy spectrum is very separate, and the main wavelet packet energy locates in 1 and 2 spectrum. If the stress concentration degree is low, then the wavelet packet energy spectrum distribution is equal; if the stress concentration degree is high, then the wavelet packet energy spectrum distribution is concentrated, and the main energy is concentrated in low frequency area.
- © 2017, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Shujun Liu AU - Shenglin Li AU - Ming Jiang AU - Dean He PY - 2017/04 DA - 2017/04 TI - Study on Magnetic Memory Testing Signal Characteristics of Pipeline Defects Based on Wavelet Packet Analysis BT - Proceedings of the Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017) PB - Atlantis Press SP - 425 EP - 430 SN - 2352-5401 UR - https://doi.org/10.2991/icmmse-17.2017.71 DO - 10.2991/icmmse-17.2017.71 ID - Liu2017/04 ER -