A Method to avoid order aliasing in COT based on filtering

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (12) : 42-44.

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A Method to avoid order aliasing in COT based on filtering

CONG Hua, WU Guang-ping, Rao Guo-qiang, FENG Fu-zhou

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Abstract

To solve the order ailiasing problem, this paper analysed the corresponding relationship between different order signal component and frequency domain, proposed and analysed the problem that different order component overlaps in frequency domain during the same rotational speed interval. According to this, the paper proposed a method using filter to limit frequency and order, deduced the principles how to choose filter cut-off frequency and angular domain resampling order. The simulation signal analysis and actual experiment both show that, the method solved order aliasing problem successfully.

Key words

computed order tracking / resampling order / anti-aliasing / filtering

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CONG Hua; WU Guang-ping; Rao Guo-qiang; FENG Fu-zhou. A Method to avoid order aliasing in COT based on filtering[J]. Journal of Vibration and Shock, 2012, 31(12): 42-44