Monday, December 31, 2018

Gas Turbine Diagnostics Signal Processing and Fault Isolation

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Widely used for power generation, gas turbine engines are susceptible to faults due to the harsh working environment. Most engine problems are preceded by a sharp change in measurement deviations compared to a baseline engine, but the trend data of these deviations over time are contaminated with noise and non-Gaussian outliers. Gas Turbine Diagnostics: Signal Processing and Fault Isolation presents signal processing algorithms to improve fault diagnosis in gas turbine engines, particularly jet engines. The algorithms focus on removing noise and outliers while keeping the key signal features that may indicate a fault.

The book brings together recent methods in data filtering, trend shift detection, and fault isolation, including several novel approaches proposed by the author. Each method is demonstrated through numerical simulations that can be easily performed by the reader. Coverage includes:
  • Filters for gas turbines with slow data availability
  • Hybrid filters for engines equipped with faster data monitoring systems
  • Nonlinear myriad filters for cases where monitoring of transient data can lead to better fault detection
  • Innovative nonlinear filters for data cleaning developed using optimization methods
  • An edge detector based on gradient and Laplacian calculations
  • A process of automating fault isolation using a bank of Kalman filters, fuzzy logic systems, neural networks, and genetic fuzzy systems when an engine model is available
  • An example of vibration-based diagnostics for turbine blades to complement the performance-based methods
Using simple examples, the book describes new research tools to more effectively isolate faults in gas turbine engines. These algorithms may also be useful for condition and health monitoring in other systems where sharp changes in measurement data indicate the onset of a fault.

About the Author
1. Introduction
2. Idempotent Median Filters
3. Median-Rational Hybrid Filters
4. FIR-Median Hybrid Filters
5. Transient Data and the Myriad Filter
6. Trend Shift Detection
7. Optimally Weighted Recursive Median Filters
8. Kalman Filter
9. Neural Network Architecture
10. Fuzzy Logic System
11. Soft Computing Approach
12. Vibration-Based Diagnostics

Author Details
"Dr. Ranjan Ganguli" is a professor in the Aerospace Engineering Department of the Indian Institute of Science (IISc), Bangalore. He received his MS and PhD degrees from the Department of Aerospace Engineering at the University of Maryland, College Park, in 1991 and 1994, respectively, and his BTech degree in aerospace engineering from the Indian Institute of Technology in 1989. He worked in Pratt & Whitney on engine gas path diagnostics during 1998–2000.

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