Method to improve the blade tip-timing accuracy of fiber bundle sensor under varying tip clearance

Fajie Duan; Jilong Zhang; Jiajia Jiang; Haotian Guo; Dechao Ye

doi:10.1117/1.OE.55.1.014106

26 January 2016 Method to improve the blade tip-timing accuracy of fiber bundle sensor under varying tip clearance

Fajie Duan, Jilong Zhang, Jiajia Jiang, Haotian Guo, Dechao Ye

Author Affiliations +

Optical Engineering, Vol. 55, Issue 1, 014106 (January 2016). https://doi.org/10.1117/1.OE.55.1.014106

Abstract

Blade vibration measurement based on the blade tip-timing method has become an industry-standard procedure. Fiber bundle sensors are widely used for tip-timing measurement. However, the variation of clearance between the sensor and the blade will bring a tip-timing error to fiber bundle sensors due to the change in signal amplitude. This article presents methods based on software and hardware to reduce the error caused by the tip clearance change. The software method utilizes both the rising and falling edges of the tip-timing signal to determine the blade arrival time, and a calibration process suitable for asymmetric tip-timing signals is presented. The hardware method uses an automatic gain control circuit to stabilize the signal amplitude. Experiments are conducted and the results prove that both methods can effectively reduce the impact of tip clearance variation on the blade tip-timing and improve the accuracy of measurements.

Citation Download Citation

Fajie Duan, Jilong Zhang, Jiajia Jiang, Haotian Guo, and Dechao Ye "Method to improve the blade tip-timing accuracy of fiber bundle sensor under varying tip clearance," Optical Engineering 55(1), 014106 (26 January 2016). https://doi.org/10.1117/1.OE.55.1.014106

Published: 26 January 2016

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