Patent ID: 9651457
Date: 2017-05-16
CPC Classifications: F02C,F05D,G01M,G05B

Claim:
1. A method for detecting degradation of a turbine engine, by a computer, by monitoring a performance of the turbine engine, the turbine engine including a plurality of functional modules, each functional module being characterised by at least one health parameter representing degradation of the functional module of the turbine engine, global aging of the turbine engine being characterised by an aging parameter, the method comprising: measuring a plurality of physical parameters of the turbine engine to form a current performance index of the turbine engine; calculating a plurality of degraded performance indices of the turbine engine by a thermodynamic model of the turbine engine, assuming for each degraded performance index that only one functional module of the turbine engine has degraded, each degraded performance index being associated with a functional module; obtaining each degraded performance index, corresponding to a single degraded functional module among all the functional modules of the turbine engine, by simulating a performance index of the turbine engine for which the health parameter of the degraded functional module and the aging parameter are variables, the health parameters of the other, non-degraded functional modules being considered to be healthy health parameters; calculating a plurality of cost indices, each cost index corresponding to the difference between the current performance index and each degraded performance index, varying the variables of the degraded performance index so that the difference is minimal, each degraded performance index being associated with its cost index; determining an optimum cost index corresponding to the one with the lowest value among all the cost indices; detecting degradation of the module of the turbine engine, the degraded performance index of which is associated with the optimum cost index.