Gas Turbine Diagnostics Signal Processing and Fault Isolation By RANJAN GANGULI

Gas Turbine Diagnostics Signal Processing and Fault Isolation By RANJAN GANGULI 

Contents :

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

Preface : 

Gas turbines are very important components of modern infrastructure and are widely used in power generation. In particular, gas turbines are used for propulsion in jet engines that power most commercial and military aircraft. Faults in gas turbine engines can result in major problems, such as delays and cancellations of flights. Engine in-flight shutdowns (IFSDs) are particularly problematic and can have an impact on flight safety. Unscheduled engine removals add to the cost of air transport. A systematic analysis of engine data has shown that most engine malfunction is preceded by a so-called single fault, which is a fault in one engine module or component. These single faults occur as sharp changes in measurement deviations in the jet engine, when compared to a baseline good engine. In this book, we present and illustrate a number of algorithms for fault diagnosis in gas turbine engines. These methods focus on the aspects of filtering or cleaning the measurement data and on fault isolation algorithms that use simple engine models for finding the type of fault in the engine. Novel methods for detecting the damage by finding the time location of a sudden change in the signal are also given. These methods include those based on Kalman filters, neural networks, and fuzzy logic and a hybrid soft computing approach.

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