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在非线性声激发下,基于羔羊波的损伤成像

Caibin Xu¹, Guangjian Gao², Mingxi Deng¹

¹College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.

|July 24, 2023

概括

这项研究引入了一种使用非线性声 (NLFM) 激发的新的Lamb波损伤成像方法. 与传统的音频爆发方法相比,这种技术提供了更好的成像质量和简化的硬件.

科学领域:

材料科学材料科学材料科学
非破坏性测试是指非破坏性测试.
波浪传播波浪传播

背景情况:

基于Lamb波的损坏检测通常需要在分辨率和检查区域之间进行权衡.
短时间的音频爆发刺激需要高的振幅来获得足够的能量,使硬件复杂化.
现有的方法难以平衡信号质量与硬件简单性.

研究的目的:

提出使用非线性声 (NLFM) 激发的替代Lamb波损伤成像方法.
为了证明NLFM激发与脉冲压缩和分散补偿的有效性.
为了提高成像质量和简化Lamb波测试中的硬件.

主要方法:

使用非线性频率调制 (NLFM) 激发,持续时间长,幅度小.
应用脉冲压缩和分散补偿来处理响应信号.
使用PZT传感器在碳钢板上进行实验,该板上有人工裂.

主要成果:

通过脉冲压缩实现NLFM激发,在相同激发幅度下比传统的音频爆发获得更好的成像质量.
通过小振幅激发提供了足够的能量,防止图像对比度降低.
消除了对高压放大器的需求,简化了Lamb波测试系统硬件.

结论:

拟议的NLFM激发方法为Lamb波损伤成像提供了一个优越的替代方案.
这种方法提高了成像质量,同时降低了硬件复杂性和成本.
它有效地解决了在损坏检测中常规音频爆发激发的局限性.

关键词:

损坏成像成像损坏成像羊羔的波浪羊羔的波浪非线性声是非线性的.脉冲压缩是指脉冲的压缩.结构性健康监测结构性健康监测

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Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by: