| 基于叶尖定时的旋转机械叶片振动频率辨识ESPRIT方法 |
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| 引用本文： | 李孟麟,段发阶,欧阳涛,孔祥洪,季茂林.基于叶尖定时的旋转机械叶片振动频率辨识ESPRIT方法[J].振动与冲击,2010,29(12):18-21. |
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| 作者姓名： | 李孟麟 段发阶 欧阳涛 孔祥洪 季茂林 |
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| 作者单位： | 天津大学精密测试技术及仪器国家重点实验室，天津 300072 |
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| 基金项目： | 国家自然科学基金，教育部新世纪优秀人才支持计划资助(NECT)项目 |
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| 摘 要： | 基于叶尖定时原理采集的旋转机械叶片振动信号是多频率混叠的欠采样信号,通过分析振动信号的数学模型,提出了在均匀转速下利用两个叶尖定时传感器构成有延迟的双通道,采用旋转不变子空间技术(ESPRIT)辨识多个叶片振动频率的新方法。介绍该方法的理论依据,推导了频率估计解模糊的具体步骤,通过计算机仿真和模拟振动平台气激实验分析该方法频率估计性能,验证了其在工程实践中的有效性。
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| 关 键 词： | 叶尖定时 叶片振动 频率辨识 欠采样 旋转不变子空间（ESPRIT） |
| 收稿时间： | 2010-1-11 |
| 修稿时间： | 2010-3-10 |
ESPRIT method for blade vibration frequency identification in rotating machinery based on blade tip-timing measurement |
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| LI Meng-lin,DUAN Fa-jie,OUYANG Tao,KONG Xiang-hong,JI Mao-lin.ESPRIT method for blade vibration frequency identification in rotating machinery based on blade tip-timing measurement[J].Journal of Vibration and Shock,2010,29(12):18-21. |
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| Authors: | LI Meng-lin DUAN Fa-jie OUYANG Tao KONG Xiang-hong JI Mao-lin |
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| Affiliation: | State Key Lab of Precision Measuring Technology＆Instruments，Tianjin 300072，China |
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| Abstract: | A new method for the frequency identification of rotating machinery blade vibration at even speed is presented. The vibration signal is obtained by the method of Blade Tip-Timing and is a Sub- Nyquist sampling data with multiple harmonics. With the analysis of signal’s mathematical model, the frequencies are identified based on ESPRIT through two Blade Tip-timing sensors which are working as delay and non-delay signal channels. The theoretic foundation of ESPRIT and the process for the frequencies estimation are introduced combining with the computer simulation and practical experimentation, which are used for testing and verifying the performance of this new method in practice. |
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| Keywords: | Blade Tip-timing Blade Vibration Frequency Identification Sub-Nyquist Sampling ESPRIT |
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