Reliability of aero-engine wheel model assisted eddy current testing based on two-parameter representation

Kai SONG; Chi ZHANG; Chenhui YAN; Ning NING; Junling FAN; Rongbiao WANG

doi:10.7527/S1000-6893.2022.27866

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2023 , Vol. 44 >Issue 13: 227866 - 227866

DOI: https://doi.org/10.7527/S1000-6893.2022.27866

Solid Mechanics and Vehicle Conceptual Design

Reliability of aero-engine wheel model assisted eddy current testing based on two-parameter representation

Kai SONG ,
Chi ZHANG ,
Chenhui YAN ,
Ning NING ,
Junling FAN ,
Rongbiao WANG

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^1.Key Laboratory of Nondestructive Testing，Ministry of Education，Nanchang Hangkong University，Nanchang 330063，China
^2.Aircraft Strength Research Institute of China，Xi’an 710065，China

E-mail： wangrongbiao@nchu.edu.cn

Received date: 2022-07-28

Revised date: 2022-08-26

Accepted date: 2022-09-15

Online published: 2022-09-22

Supported by

National Natural Science Foundation of China(51865033);Special Scientific Research Program from the Ministry of Industry and Information Technology of China;PhD Start-up Foundation(EA202208183)

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Abstract

The key index $a 90 / 95$ of Probability of Detection （POD） is used in the design of aero-engine disk damage tolerance. Aiming at the problem that $a 90 / 95$ of the POD study on single size parameters causes inaccurate capability representation of the eddy current detection system， this paper proposes a Model-Assisted Probability of Detection （MAPOD） model based on two-parameter representation by analyzing the influence of length and depth factors of manual grooving defects on POD. The model assumes that the eddy current response amplitude of the defect described by the two-dimension parameter vector x follows a normal distribution. The simulation and eddy current test response data are substituted into the maximum likelihood estimation to obtain the model parameters， and the reliability parameters characterizing the detection system are then calculated. After analysis of the eddy current signal generated by the TC4 defect， the influence degree of the number of defects on the single parameter model and the improved model is compared. The results show that the improved MAPOD model can characterize the Nondestructive Testing（NDT） system capability more accurately with fewer samples compared with the single-parameter POD model. Finally， the detection capability of the aero-engine wheel eddy current testing system is evaluated with a small number of defect samples， providing important basis for aero-engine maintenance cycle and DamageTolerance （DT） design.

Key words： turbine disc; eddy current testing; two-parameter; model assisted method; nondestructive testing reliability

Cite this article

Kai SONG , Chi ZHANG , Chenhui YAN , Ning NING , Junling FAN , Rongbiao WANG . Reliability of aero-engine wheel model assisted eddy current testing based on two-parameter representation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(13) : 227866 -227866 . DOI: 10.7527/S1000-6893.2022.27866

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