| 脉冲激励下信号去噪新方法研究和仿真 |
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| 引用本文： | 岳林,张令弥.脉冲激励下信号去噪新方法研究和仿真[J].振动工程学报,2003,16(3):335-338. |
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| 作者姓名： | 岳林 张令弥 |
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| 作者单位： | 南京航空航天大学振动工程研究所,南京,210016 |
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| 基金项目： | 国家自然科学基金资助项目(编号:5007538)，航空基金资助项目(编号:00152074) |
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| 摘 要： | 采用小波滤波原理，建立了一种基于Morlet小波的FIR滤波器组，滤除脉冲激励下输出信号的噪声，并保证滤波后相位不变。为验证该方法的有效性和准确性，采用二维框架结构的有限元模型，对四阶模态系统进行仿真。仿真结果表明．在大噪声污染下，原来已经识别不出的参数．经过滤波后，可以识别出来．而且结果良好。该方法对于振动工程现场测试有很大应用价值。
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| 关 键 词： | 脉冲激励 信号处理 仿真 小波滤波 信号去噪 |
| 修稿时间： | 2002年3月20日 |
Study and Simulation on New Signal De-Noise Method under Impulse Excitation |
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| Yue Lin Zhang Lingmi.Study and Simulation on New Signal De-Noise Method under Impulse Excitation[J].Journal of Vibration Engineering,2003,16(3):335-338. |
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| Authors: | Yue Lin Zhang Lingmi |
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| Abstract: | A new and effective signal de-noise method based on Morlet wavelet is implemented. By constructing the perfect filter bank the sampled signal can get rid of noise after filtering in time and frequency domain. The method is very effective on impulse input. A numerical simulation is empolyed to study its validity by using FRAME model data to construct four model systems. The result shows that the de-noise approach is very useful and effective to get desired frequency response function when the sampled signal is corrupted by strong noise . |
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| Keywords: | impulse response signal de-noise numerical simulation Morlet wavelet |
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