相位信息在声发射信号处理中的应用
Application of Phase Information in Processing Acoustic Emission Signal
摘 要
根据声发射信号采样率高、数据量大和信号能量微弱的特点，研究了基于相位增强技术的功率谱分析方法，在对声发射信号进行不损失信息的高频采样前提下，通过对信号进行二次傅里叶变换，提高了信噪比。用模拟信号对该方法进行了验证，并应用在运行中的隔膜泵曲轴的裂纹扩展监测上，结果表明此方法能有效检出由于裂纹扩展所产生的微弱的声发射信号。
相位信息
裂纹扩展检测
Acoustic emission
Phase information
Crack growth detection
Abstract
Acoustic emission signal needs high sample rate with large numbers of data and its energy is weak. According to these, the power spectral density analysis method basedon phase enhancement technique was studied. The signaltonoise ratio was increased with second FFT on the signal after highspeed sampling process without losing useful information. Simulation and practice diagnostic application verified the effectiveness of the method. Applied to detect the crack growth on the crank shoulder of septumpump in running condition, the weak acoustic emission signal due to crack growth was detected easily.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目
收稿日期 2005/1/1
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备注李崇晟(1976-),博士生，从事微弱信号检测、机械故障早期诊断及其声发射检测工作。
引用该论文: LI Chongsheng,SHEN Yudi,LI Fengying. Application of Phase Information in Processing Acoustic Emission Signal[J]. Nondestructive Testing, 2007, 29(1): 24～26
李崇晟,沈玉娣,李凤英. 相位信息在声发射信号处理中的应用[J]. 无损检测, 2007, 29(1): 24～26
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参考文献
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【2】屈梁生，何正嘉.机械故障诊断学[M].上海：上海科学技术出版社,1986:81-86.
【3】腾山邦久，编著.声发射(AE)技术的应用[M].冯夏庭，译.北京：冶金工业出版社,1997.
【4】Harris D O, Bell R L. The measurement and Significance of energy in acoustic emission testing[J]. Exp Mech,1977,17(9):347-353.
【5】Krzysztof Jemielniak. Some aspects of acoustic emission signal preprocessing[J]. Journal of Materials Processing Technology,2001,109(3):242-247.
【6】Marshall Space Flight Center, Alabama. Coherent Phase Line Enhancer: a Method of Spectral Analysis[DB/OL]. http://www.nasatech.com/Briefs/July01/MFS31426.html.
【7】Majeed M A, Murthy C R L. A model with nonzero rise time for AE signals[J]. Sadhana,2001,25(5):465.
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