Civil aviation engine gas path anomaly detection method based on piecewise fitting analysis and evaluation

An abnormality detection and engine technology, applied in complex mathematical operations, instruments, data processing applications, etc., can solve the problems of one-sidedness of the engine and the hysteresis of information feedback cannot meet the needs of early warning.

Active Publication Date: 2020-08-28
HARBIN INST OF TECH AT WEIHAI
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  • Abstract
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Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to provide a method for abnormal detection of air path of civil aviation engines, which solves the one-sided problem of using a single characteristic parameter to detect abnormalities of engines in the prior art, and the hysteresis of information feedback in CNR reports cannot meet the requirements. The problem with the need for early warning

Method used

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  • Civil aviation engine gas path anomaly detection method based on piecewise fitting analysis and evaluation
  • Civil aviation engine gas path anomaly detection method based on piecewise fitting analysis and evaluation
  • Civil aviation engine gas path anomaly detection method based on piecewise fitting analysis and evaluation

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Embodiment 1

[0092] The deviation value of gas path parameters of civil aviation engine belongs to the typical multidimensional time series data without label information, and there is a coupling effect between the parameters. In order to accurately mine the data pattern that characterizes the abnormal state of civil aviation engine, it is necessary to comprehensively consider the time correlation and spatial correlation of multidimensional time series. In order to improve the accuracy and stability of gas path abnormality detection.

[0093] The anomalous forms in time series can be defined as two types of anomalies, which are sequence form anomalies and point form anomalies. In the abnormal detection of engine gas path, the above two types of abnormalities can be called gas path evolution abnormality and gas path mutation abnormality respectively.

[0094] The gas path evolution abnormality refers to the abnormal mode in which the performance of the engine gas path components gradually d...

Embodiment 2

[0183] In the second embodiment, the detection method proposed in the first embodiment is verified through experiments. The data sets used in the experiment are shown in Table 1 in Example 1. They are all selected from 5 civil aviation engines whose model is CFM56-5B2 / 3 and have experienced abnormal modes. The abnormal modes are EGT indication abnormality, LPTACC abnormality and VBV The system is abnormal. Since the detection methods of the three different abnormal modes are similar, this experiment selects one of the civil aviation engines with abnormal EGT indications as an example to illustrate the experiment. The serial number of this engine is #697950. According to the CNR report, this experiment collected a total of There are 5880 samples, including 5879 normal samples and 1 abnormal sample. Part of the sample data and its distribution are shown in Table 6 and Table 7 respectively.

[0184] Table 6#697950 civil aviation engine part data

[0185]

[0186] Table 7 Sam...

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Abstract

The invention discloses a civil aviation engine gas path anomaly detection method, and belongs to the technical field of aero-engine detection. The civil aviation engine gas path anomaly detection method solves the problems that in the prior art, one-sidedness exists when a single characteristic parameter is adopted for carrying out anomaly detection on the engine, and hysteresis exists in information feedback in a CNR report and cannot meet the early warning requirement. The technical scheme adopted by the invention comprises the following steps: dividing a multi-dimensional gas path parameter deviation value time sequence into sub-sequences, carrying out secondary division on the sub-sequences, and screening significant characteristic parameters; and evaluating, optimizing and sequencingthe tail end features by using an entropy evaluation method, determining an anomaly detection feature matrix, and realizing gas path anomaly detection and early warning by using an isolated forest anomaly detection algorithm. Experiments prove that the civil aviation engine gas path anomaly detection method can well realize gas path anomaly detection, and has far-reaching guiding significance forengineering practical application.

Description

technical field [0001] The invention relates to the field of aero-engine detection, and relates to a method for detecting abnormality of a gas path of a civil aero-engine. Background technique [0002] The civil aviation engine is a major product required to provide power for the aircraft. Once it is abnormal, it will cause immeasurable losses. Therefore, performance testing of civil aviation engine air circuit components and units before each flight mission plays an extremely important role in maintaining the health of the engine. During the actual flight of civil aviation aircraft, since civil aviation engines work in a high temperature and high pressure environment for a long time, it is easy to cause problems such as blade erosion, foreign matter damage, fuel nozzle blockage, corrosion, and excessive turbine blade clearance. The unit body wears and deteriorates, and its performance declines with the working time, which is mainly reflected in the deviation value of the g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06F17/16
CPCG06Q10/06393G06F17/16Y02T10/40
Inventor 付旭云周星杰钟诗胜张永健
Owner HARBIN INST OF TECH AT WEIHAI
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