| 超声导波的频散补偿与模式分离算法研究 |
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| 引用本文： | 许凯亮,谈钊,他得安,王威琪.超声导波的频散补偿与模式分离算法研究[J].声学学报,2014,39(1):99-103. |
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| 作者姓名： | 许凯亮 谈钊 他得安 王威琪 |
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| 作者单位： | 复旦大学 电子工程系 上海 200433 |
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| 基金项目： | 国家自然科学基金(11174060,11327405,11304043);上海市科技支撑计划(13441901900);教育部博士点基金(20110071130004);教育部新世纪优秀人才计划(NCET-10-0349);中国博士后基金(2012M520826)资助 |
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| 摘 要： | 超声导波已被广泛应用于无损检测与评价,针对超声导波应用中普遍存在的模式混叠与频散问题,本文在采用频谱相位与信号时延函数建模导波频散信号传递系统的基础上,提出了一种单一模式的频散补偿算法。进一步地,通过将选择性频散补偿技术与导波模式分离相结合,本文算法克服了传统补偿算法所不能解决的多模式导波频散问题。板中的Lamb波A0,A1和S0混合模式仿真分析表明,本算法不仅可用于单一导波模式信号合成与频散补偿,而且可在实现多模式混合导波信号选择性频散补偿基础上,解决多模式导波信号中单一模式提取与分离。本文研究有助于超声导波多模式频散信号的分析与处理.
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| 关 键 词： | 超声导波 理论频散曲线 多模式 导波模式 模式分离 完全补偿 补偿算法 传递函数 激励信号 模式混合 |
| 收稿时间： | 2012-10-14 |
Dispersion compensation and mode separation of the ultrasonic guided waves |
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| Institution: | Department of Electronic Engineering, Fudan University Shanghai 200433 |
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| Abstract: | The application of ultrasonic guided waves has been got considerable attentions in non-destructive evaluation (NDE). However, the mode overlap and dispersion problem of guided waves are still challenging. In the present study, we used the spectral phase and time delay function to model the guided dispersion transfer system, and developed a compensation algorithm of single mode dispersion. Aiming to overcome the unsolved difficulty of multimode processing, dispersion compensation was then combined with the mode separation. Simulations of the Lamb modes A0, A1 and S0 illustrated that the proposed algorithm is capable of synthesizing and compensating of single mode dispersion. Furthermore, using the selectively compensation, the individual modes can also be extracted from the multimodal guided signals. The study is helpful for the signal processing of multimodal guided dispersion. |
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