A Single Probe Blade Tip Timing Method for Fast Extraction of Blade Natural Frequency
Title of Paper:
A Single Probe Blade Tip Timing Method for Fast Extraction of Blade Natural Frequency
Journal:
IEEE Transactions on Instrumentation and Measurement
Summary:
With the advantages of non-contact and the characteristic of the whole circumferential blade measurement, blade tip
timing (BTT) technology shows vast potential for blade vibration
monitoring. However, the frequency aliasing and non-uniformity
in BTT signals remain the core challenges for accurate blade
vibration reconstruction from BTT signals. In this study, a single
probe-based method that can extract the natural frequency of
the rotating blade rapidly and accurately without considering
the layout and number of the probes was proposed. First and
foremost, a virtual signal is generated based on the BTT signal.
Then, the two signals are multiplied and FFT is performed. By
searching for peaks to find specific frequencies in the spectrum,
de-aliasing can be achieved based on the frequency components
in the product signal, and ultimately the natural frequency of
the blade is obtained. The numerical and experimental results
have verified the effectiveness of the method. The potential of
the proposed method for small sample signal analysis and online
blade health monitoring has also been demonstrated.
Co-author:
Huahui Hu, Laihao Yang*, Zhibo Yang*, Ruochen Jin, Shaohua Tian, Wenbo Li, Yu Sun
Papers
