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Optical Engineering

Method to improve the blade tip-timing accuracy of fiber bundle sensor under varying tip clearance
Author(s): Fajie Duan; Jilong Zhang; Jiajia Jiang; Haotian Guo; Dechao Ye
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Paper 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.

Paper Details

Date Published: 26 January 2016
PDF: 4 pages
Opt. Eng. 55(1) 014106 doi: 10.1117/1.OE.55.1.014106
Published in: Optical Engineering Volume 55, Issue 1
Show Author Affiliations
Fajie Duan, Tianjin Univ. (China)
Jilong Zhang, Tianjin Univ. (China)
Jiajia Jiang, Tianjin Univ. (China)
Haotian Guo, Tianjin Univ. (China)
Dechao Ye, Tianjin Univ. (China)

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