Amplitude Modulation-Frequency Modulation Multi-Mode Noise Signal Extraction by Short-Time Fourier Transform

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Amplitude Modulation-Frequency Modulation Multi-Mode Noise Signal Extraction by Short-Time Fourier Transform

更新时间：2025-07-09

- Amplitude Modulation-Frequency Modulation Multi-Mode Noise Signal Extraction by Short-Time Fourier Transform
- Vol. 46, Issue 7, Pages: 93-97(2012)
- 作者机构：
  
  西安交通大学机械制造系统工程国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN911.72
- Online First：10 July 2012，
  
  Published：2012
- 稿件说明：
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Amplitude Modulation-Frequency Modulation Multi-Mode Noise Signal Extraction by Short-Time Fourier Transform[J]. 2012, 46(7): 93-97.
DOI：

Amplitude Modulation-Frequency Modulation Multi-Mode Noise Signal Extraction by Short-Time Fourier Transform[J]. 2012, 46(7): 93-97. DOI：

摘要

针对结构健康监测过程中的Lamb波多表现为复杂的多模态调频调幅信号

而无法实现对其模态成分进行精确提取的问题

提出了一种计算信号各模态在短时傅里叶平面上频率宽度的方法.通过对调频调幅信号的短时傅里叶变换能量分布的深入分析

将拟重构的模态成分宽度分为瞬时带宽区域和加窗旁瓣区域两部分

解决了影响模态提取精度的关键问题

从而利用时频变换的逆变换重构区域系数

实现了调频调幅信号成分模态的精确提取.通过对模拟信号提取误差的对比验证分析

由调频调幅模态的提取结果表明了该方法的有效性和鲁棒性.

Abstract

Lamb wave in structural health monitoring performs as multi-mode amplitude modulation-frequency modulation(AM-FM)signals

which is difficult to be extracted accurately. A new method is proposed to estimate the width of each mode on the short-time Fourier plane. Analyzing the energy distribution of the AM-FM signal

the reconstructing width is divided into two parts

i.e. the instantaneous bandwidth region and the window lobes region. The inverse short-time Fourier transform is then employed to extract each mode accurately by reconstructing the coefficients in these two regions. The effectiveness and robustness are testified by a quantitative comparison analysis of the simulated signal.

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references

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