Patent ID: 7788014
Filing Date: 2010-08-31
Classification: F05B,G05B

Abstract:
1. A performance tracking method for narrowing an assessment of root cause RC to a single turbine or compressor stage, or a combination of stages within at least one gas turbine engine module comprising: inputting engine gas path measurement data from a gas turbine engine module; performing a gas path analysis on the gas path measurement data to derive % Δ performance vectors; calculating estimated module efficiency {circumflex over (η)} and flow parameter F{circumflex over (P)} deltas (Δ's) for each % Δ performance vector; calculating a coupling ratio ΔC{circumflex over (R)} for each % Δ performance vector; calculating a variability for each coupling ratio ΔC{circumflex over (R)}; calculating a level-of-belief lob(x,RC calculating a confidence level for each module RC selecting a module root cause RC having a maximum confidence level; and determining from said selected module root cause having said maximum confidence level a single turbine or compressor rotor or a combination of turbine or compressor stages in said at least one gas turbine engine module having deterioration issues.