Aero-engine gas path online monitoring method based on corrected partial derivative

The invention relates to an aero-engine gas path online monitoring method based on a corrected partial derivative. According to the aero-engine gas path online monitoring method based on the corrected partial derivative, a pressure ratio function representing the working state of each part of an engine is selected as a correction parameter, and the influence of small disturbance of a state variable and a control variable on the correction parameter is considered; an engine linearization model with high precision and real-time performance is obtained and applied to engine gas path health parameter online tracking and fault diagnosis, and therefore the online monitoring method which can meet the real-time performance requirement of an engine gas path and can have high precision is developed. The method is of great significance in improving the on-line monitoring capability of the aero-engine gas circuit and ensuring the reliability and safety of the aero-engine. 本发明涉及一种基于修正偏导数的航空发动机气路在线监测方法。目的是提供了一种基于修正偏导数的航空发动