Fiber Bragg grating scanning spectral characteristics and temperature measurement error under rotor whirling conditions

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (12) : 17-29.

CHEN Sitong1，HUANG Junbin1，LIU Wen1，LI Zheyu2，GU Hongcan1，YAO Gaofei1

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Abstract

For the motor rotor temperature monitoring system based on the spatial coupled transmission method, the scanning spectral model of fiber Bragg grating (FBG) on the whirling rotor is established. The distortion law of the scanning spectra and the peak-finding results of each algorithm are firstly investigated. The results show that the whirling rotor leads to the shift of the reflection peaks and the reduction of the 3dB bandwidth in the scanning spectra of the FBG. The maximum scanning error of the center wavelength changes with a sinusoidal function as the phase difference between the coupling loss and the original reflection peaks changes. The position of the new reflectance peak is determined by the limiting relationship between the rate of change of the coupling loss, the original FBG reflectance and change rate. Coordinating the numerical relationship between the scanning rate of the demodulator and the frequency of the rotor whirl is the main method to mitigate spectral aberration. In addition, compared with the half-peak method and various fitting-type algorithms, the centroid method also significantly reduces the scanning error at the center wavelength. Then, the effects of the rotor whirl frequency and the demodulator scanning frequency on the system temperature measurement error are investigated by theory and experiment. The results show that the maximal temperature measurement error firstly decreases drastically, and then decreases slowly, and finally stays stable, with the increase of the ratio of the coupling loss period to the spectral scanning time (q-value). q>10 is the minimum condition to ensure that the system's temperature measurement error and its fluctuation are small. For rotor speed less than 200000rpm (whirl frequency less than 1667Hz), when the amplitude of the rotor radial vibration is less than 200μm, the axial ratio of the axial trajectory is less than 3, and the angle of axial line deflection is less than 0.1°, the use of a scanning frequency greater than 760Hz demodulator and the centroid method can ensure that the whirl induced temperature measurement error is less than 0.3 ℃. This paper provides a basis for the practical application of the rotor temperature monitoring system and the prediction of the temperature measurement error.

Key words

fiber Bragg grating(FBG) sensors / rotor temperature monitoring system / rotor whirling / distorted spectrum / measurement error

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CHEN Sitong1, HUANG Junbin1, LIU Wen1, LI Zheyu2, GU Hongcan1, YAO Gaofei1. Fiber Bragg grating scanning spectral characteristics and temperature measurement error under rotor whirling conditions[J]. Journal of Vibration and Shock, 2024, 43(12): 17-29

References

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