| 一种含噪声多模态调频调幅信号的提取方法 |
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| 引用本文： | 谢航,廖与禾,林京.一种含噪声多模态调频调幅信号的提取方法[J].西安交通大学学报,2012,46(7):93-97. |
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| 作者姓名： | 谢航 廖与禾 林京 |
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| 作者单位： | 1. 西安交通大学机械制造系统工程国家重点实验室,710049,西安
2. 西安交通大学机械制造系统工程国家重点实验室,710049,西安;西安陕鼓动力股份有限公司,710075,西安 |
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| 基金项目： | 国家自然科学基金资助项目，教育部重点实验室开放基金，中央高校基本科研业务费专项资金资助项目 |
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| 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.
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| 关 键 词： | 调频调幅信号 瞬时带宽 结构健康监测 |
Amplitude Modulation-Frequency Modulation Multi-Mode Noise Signal Extraction by Short-Time Fourier Transform |
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| XIE Hang
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LIAO Yuhe
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LIN Jing.Amplitude Modulation-Frequency Modulation Multi-Mode Noise Signal Extraction by Short-Time Fourier Transform[J].Journal of Xi'an Jiaotong University,2012,46(7):93-97. |
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| Authors: | XIE Hang LIAO Yuhe LIN Jing |
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| Institution: | 1(1.State Key Laboratory for Manufacturing Systems Engineering,Xi’an Jiaotong University,Xi’an 710049,China; 2.Xi’an Shaangu Power Co.,Ltd,Xi’an 710075,China) |
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| 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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| Keywords: | amplitude modulation-frequency modulation signal instantaneous bandwidth structure health monitoring |
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