低采样率下对高频信号的识别方法
IDENTIFICATION OF HIGH FREQUENCY SIGNAL UNDER LOW SAMPLING RATIO
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摘要: 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)fc为采样频率fs的一半(fc=fs/2)。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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