| 基于小波包能量谱的磁记忆检测方法 |
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| 引用本文： | 白鹭,任吉林,范振中. 基于小波包能量谱的磁记忆检测方法[J]. 无损检测, 2008, 30(10) |
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| 作者姓名： | 白鹭 任吉林 范振中 |
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| 作者单位： | 南昌航空大学无损检测技术教育部重点实验室 北京强度环境研究所 |
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| 摘 要： | 提出磁记忆信号的小波包能量谱分析方法,以小波包变换理论为基础,通过对有中心小孔缺陷的45号钢和18CrNi4A试样进行拉伸试验,采集不同载荷下试样表面的磁记忆信号。用sym6小波对所得信号进行小波包能量谱特征分析。该方法可有效判断试样的应力集中部位及应力集中程度。
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| 关 键 词： | 金属磁记忆检测 小波包 能量谱 |
The Metal Magnetic Memory Testing Based on Wavelet Packet Energy Spectrum |
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| BAI Lu,REN Ji-Lin,FAN Zhen-Zhong. The Metal Magnetic Memory Testing Based on Wavelet Packet Energy Spectrum[J]. Nondestructive Testing, 2008, 30(10) |
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| Authors: | BAI Lu REN Ji-Lin FAN Zhen-Zhong |
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| Affiliation: | 1 (1.Nanchang Hangkong University; the Key Laboratory of Nondestructive Testing; Ministry of Education; Nanchang 330063; China; 2.Beijing Institute of Structure and Enviroment Engireering; Beijing 100076; China); |
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| Abstract: | The wavelet packet energy spectrum analysis method of magnetic memory signals was proposed.On the theoretical basis of wavelet packet transform,by carrying out stretching experiments on specimens of 45 steel and aeronautical ferromagnetic material 18CrNi4A,magnetic memory signals under different loads on the surface of the specimens were acquired and analysed with wavelet packet energy spectrum.Thus the stress concentration area and its extent of the specimens could be judged effectively. |
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| Keywords: | Metal magnetic memory testing Wavelet packet Energy spectrum |
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