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Research Papers: Gas Turbines: Structures and Dynamics

Synthesized Synchronous Sampling Technique for Differential Bearing Damage Detection

[+] Author and Article Information
Huageng Luo, Hai Qiu, George Ghanime

 GE Global Research Center, Niskayuna, NY 12309

Melinda Hirz, Geo van der Merwe

 GE Aviation, Evendale, OH 45215

J. Eng. Gas Turbines Power 132(7), 072501 (Apr 07, 2010) (8 pages) doi:10.1115/1.4000092 History: Received March 18, 2009; Revised July 30, 2009; Published April 07, 2010; Online April 07, 2010

The differential bearing between the low-pressure turbine (LPT) and high-pressure turbine (HPT) shafts is one of the most vulnerable parts in a turbomachinery engine. Unfortunately, it is also one of the most difficult parts to monitor for damage existence signatures, because the signal-to-noise ratio at the normal sensor locations is extremely low. In addition, the speed variations in both the LPT and HPT can further deteriorate the damage signature extracted by conventional analysis methods. In this paper, we developed a “synthesized synchronous sampling” technique to enhance the detection of differential bearing damage signature. Combining this technique together with the conventional acceleration enveloping technique, we are able to detect differential bearing damage at a much earlier stage, thus providing early warnings of the machinery health conditions.

Copyright © 2010 by American Society of Mechanical Engineers
Topics: Bearings , Vibration
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References

Figures

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Analog devices based approach

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Digital processing based approach

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Figure 4

Synchronous sampling—analog approach

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Figure 5

Time synchronous averaging

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Synchronous sampling

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Synthesized tachometer generation from speed function

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Simulated varying shaft speed and the corresponding pulse train

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Synthesized pulse train

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Synthesized speed

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Speed error simulation

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Synthesizing error

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Differential bearing test rig

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Test bearing with EDM notch on the outer race

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Locations of accelerometer on the test rig

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Implementation flow chart

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Figure 17

Speeds of the differential bearing races

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Differential bearing fBPFO

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Initial results

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