Method for determining degeneration rate of aircraft engine according to vibration signal

Abstract

The invention provides a method for determining the degeneration rate of an aircraft engine according to a vibration signal. The method comprises the steps of obtaining the engine vibration value distribution curve and degeneration rate curve through fitting by means of the support vector regression method; judging statistic abnormal points in the high-error-rate regression distribution curve and step change points in the high-error-rate degeneration rate curve, eliminating the statistic abnormal points and the step change points, and conducting segmentation on each observation value according to step change; finally, refitting the engine degeneration rate curve by conducting low-error-rate support vector regression on each segment. The method is high in precision and reliability, the degeneration condition of the aircraft engine can be effectively assessed in use, and the obtained degeneration rate curve can serve as the reference of maintenance of the engine and can also be applied to a long-term usage plan of the engine.

Description

technical field [0001] The invention relates to the technical field of aircraft engine performance analysis, in particular to a method for determining the degradation rate of an aircraft engine according to a vibration signal for evaluating engine performance. Background technique [0002] Analyzing and evaluating the degradation of aircraft engines plays an important role in the practical application of aircraft engines. For example, for an aircraft that performs commercial routes, its engine maintenance management depends on accurate prediction of overhaul time, which depends on the degradation of the engine. Knowing the degradation characteristics of the engine in detail, you can improve the engine fault diagnosis ability by changing the alarm threshold; and in the design process, paying attention to the incentives of the engine degradation characteristics can also guide the design of the engine. Therefore, analyzing and researching the performance degradation phenomenon ...

AI Technical Summary

Problems solved by technology

[0004] In practical applications, aircraft engine vibration values ​​have been widely used in the state assessment of aircraft engines, but due to the flaws in some original engine data, the existence of these flaws makes it particularly complicated to use aircraft engine vibration values ​​to analyze and evaluate engine degradation, and it is obtained The degradation curve is less accurate

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