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| 基于时频信息提取的两自由度时变模态参数识别方法 | |
| 引用本文： | 石志晓,李大望,周晶,李昕.基于时频信息提取的两自由度时变模态参数识别方法[J].河南科学,2007,25(6):896-899. |
| 作者姓名： | 石志晓 李大望 周晶 李昕 |
| 作者单位： | 1. 郑州大学,土木工程学院,郑州,450002 2. 深圳大学,土木工程学院,深圳,518060 3. 大连理工大学,土木水利学院,辽宁,大连,116024 |
| 基金项目： | 国家自然科学基金 , 河南省高校杰出科研创新人才工程项目 , 河南省教育厅自然科学基金 |
| 摘 要： | 通过对非线性结构响应的Gabor小波谱进行重排,从中提取出反映系统频率的时频脊线,由脊线得到非线性结构的瞬时频率和幅值,进而识别出结构响应信号的骨架曲线.对1个两自由度结构的算例分析表明:通过重排谱和脊线能较理想地识别出系统的时变频率和骨架曲线,脊线的方法比常规的优化方法简便. |
| 关 键 词： | 模态参数 时频重排 小波变换 脊线 |
| 文章编号： | 1004-3918（2007）06-0896-04 |
| 修稿时间： | 2007-05-08 |
Time-varying Parameter Identification of 2-Dof System Using Time-frequency Information |
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| SHI Zhi-xiao,LI Da-wang,ZHOU Jing,LI Xin.Time-varying Parameter Identification of 2-Dof System Using Time-frequency Information[J].Henan Science,2007,25(6):896-899. | |
| Authors: | SHI Zhi-xiao LI Da-wang ZHOU Jing LI Xin |
| Institution: | 1. School of Civil Engineering of Zhengzhou University, Zhengzhou 450002, China; 2. School of Civil Engineering of Shenzhen University, Shenzhen 518060, China; 3. School of Hydraulic and Civil Engineering of Dalian University, Dalian 116024, China |
| Abstract: | Gabor wavelet spectrogram is reassigned to extract Time-frequency ridge.Then time-varying frequency and amplitude are gotten from Time-frequency ridge.Finally the skeleton curves of nonlinear system are calculated,which contain the characteristics of nonlinear system.An example of 2-dof system indicate that time-varying of frequency and skeleton can be well identified by reassignment spectrogram and ridges,and the method extracting ridge from reassignment spectrogram is better than the method of optimization. |
| Keywords: | modal parameter time-frequency reassignment spectrogram wavelet transform ridge |
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