| 低采样率下对高频信号的识别方法 |
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| 引用本文： | 张益松,伊立言. 低采样率下对高频信号的识别方法[J]. 航空动力学报, 1988, 3(1): 70-72,94-95 |
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| 作者姓名： | 张益松 伊立言 |
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| 作者单位： | 南京航空学院(张益松)，南京航空学院(伊立言) |
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| 摘 要： | 一、问题的提出 对于航空涡喷发动机等旋转机械,其叶片振动信号的提取已由接触式发展到非接触式。转子每转一周,每个叶片经过探头位置一次,产生一次采样。所以探头对单个叶片信号的平均采样率等于转子的运转速率。而根据采样定理,截止频率(Nyguist频率)f_c为采样频率f_s的一半(f_c=f_s/2)。
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| 收稿时间： | 1986-11-01 |
IDENTIFICATION OF HIGH FREQUENCY SIGNAL UNDER LOW SAMPLING RATIO |
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| Zhang Yisong and Yi Liyan. IDENTIFICATION OF HIGH FREQUENCY SIGNAL UNDER LOW SAMPLING RATIO[J]. Journal of Aerospace Power, 1988, 3(1): 70-72,94-95 |
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| Authors: | Zhang Yisong and Yi Liyan |
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| Affiliation: | Nanjing Aeronautical Institute;Nanjing Aeronautical Institute |
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| Abstract: | Considering that the highest resolving frequncy in dynamic data is restricted by sampling ratio,a new method is proposed to identify the high frequency signal from three low-ratio sampling spectra. The complicated case of vibration measurement ofrotary blades is investigated with error analysis and illustratrated by a numerical example. |
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