| 混凝土结构健康检测的声发射圆阵波束形成仿真分析 |
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| 引用本文： | 刘鑫磊,袁昌明,王强. 混凝土结构健康检测的声发射圆阵波束形成仿真分析[J]. 中国计量学院学报, 2011, 22(1) |
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| 作者姓名： | 刘鑫磊 袁昌明 王强 |
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| 作者单位： | 中国计量学院,质量与安全工程学院,浙江,杭州,310018 |
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| 摘 要： | 采用了声发射(Acoustic Emission,AE)均匀圆阵并分析其波束形成特性,通过仿真分析了阵元数目及声发射模拟信号频率的变化对波束模式的影响.结果表明,当频率不变,阵元数目为4~32时,随着阵元数目的增加,角分辨率保持不变,最高旁瓣降低,可达-8 dB左右.混凝土结构内部缺陷声发射信号的超声频段一般在25~200 kHz,当阵元数目不变时,随着频率的升高,角分辨率随之升高,最高旁瓣也随之增大.另外,文中提出如何设计一个性能相对稳定的阵列,并通过从噪声信号中提取有用信号的实例说明声发射均匀圆阵空间匹配滤波性能.
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| 关 键 词： | 声发射技术 阵列信号 波束形成 均匀圆阵 仿真分析 |
The simulation analysis of acoustic emission circular array beamforming for concrete structural health monitoring |
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| LIU Xin-lei,YUAN Chang-ming,WANG Qiang. The simulation analysis of acoustic emission circular array beamforming for concrete structural health monitoring[J]. Journal of China Jiliang University, 2011, 22(1) |
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| Authors: | LIU Xin-lei YUAN Chang-ming WANG Qiang |
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| Affiliation: | LIU Xin -lei; YUAN Chang-ming; WANG Qiang(Deptment of Quality and Safety Engineering; China Jiliang University; Hangzhou 310018; China); |
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| Abstract: | We designed uniform circular array of acoustic emission and analyzed its beamforming characteristics.By the simulation analysis,the number of array elements and frequency of the acoustic emission analog signals had influence on the array beampattern.When the signal frequency band was fixed,the number of array elements varied from 4 to 32,with the number of array elements increasing,the angular resolution remained unchanged,but the maximum sidelobe reduced to-8 dB.AE signals of internal defects in the concre... |
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| Keywords: | acoustic emission technology array signal beamforming uniform circular array simulation analysis |
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