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Impulse Response01:17

Impulse Response

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The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
Kirchhoff's law forms an input signal equation, with the capacitor's current and voltage providing the output. Substituting the current and dividing by RC yields a differential equation. The output for an impulse input is the impulse...
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相关实验视频

Updated: Apr 13, 2026

Real-time Monitoring of High Intensity Focused Ultrasound HIFU Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound HMIFU
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导向的羔羊波阵列基于时间延迟的MUSIC算法用于冲击成像.

Fei Zheng1, Shenfang Yuan1

  • 1Research Center of Structural Health Monitoring and Prognosis, State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China.

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概括
此摘要是机器生成的。

本研究介绍了一种改进的MUSIC算法,用于在复合材料中精确地定位冲击. 它通过管理时间延迟和提取单频信号来提高精度,以便更好地监测结构健康.

关键词:
阵列时间延迟时间延迟这是一个复合材料.导向的羔羊波浪 带领的羔羊波浪影响监测 影响监测多重信号分类多重信号分类

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科学领域:

  • 材料科学 材料科学 材料科学
  • 结构健康监测 结构健康监测
  • 声学传感 声学传感 声学传感

背景情况:

  • 复合材料在航空航天领域非常重要,因为它们的高刚性,强度和低重量.
  • 低速冲击对复合结构构成重大风险,需要有效监测.
  • 现有的MUSIC算法面临的挑战是信号带宽,时间延迟和材料异质性,限制了冲击定位的准确性.

研究的目的:

  • 开发一种创新的MUSIC算法,用于在复合材料中增强冲击成像.
  • 为了解决和减轻当前冲击本地化方法中固有的时间延迟错误.
  • 提高复合结构结构结构健康监测的精度和可靠性.

主要方法:

  • 提出了一种新的MUSIC算法,利用引导的Lamb波阵列,专注于时间延迟管理.
  • 从冲击响应信号中提取高能单频组件,以准确测量时间延迟和抗噪.
  • 计算单频组件的平均速度,以估计撞击角度,并指导特定速度的选择,以准确定位.

主要成果:

  • 拟议的方法准确地确定实验设置中的数组元素之间的时间延迟.
  • 对钢筋复合结构的冲击定位测试表明,在识别冲击位置方面具有很高的精度.
  • 与传统方法相比,改进的算法显示了更好的抗噪和准确性.

结论:

  • 开发的MUSIC算法有效地克服了对复合材料冲击本地化现有方法的局限性.
  • 精确的时间延迟管理和单频分析对于精确的撞击成像至关重要.
  • 这种方法为航空航天复合材料应用的结构健康监测提供了显著的进步.