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Bauhaus Luftfahrt Jahrbuch 2019

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29

Flussdiagramm des

ML-Prozesses

Das ML-Modell wird darauf trainiert, akustische

Merkmale verschiedener Prozessqualitäten zu

unterscheiden. Aus dieser Klassifikationsfähigkeit

wurde die Detektionswahrscheinlichkeit für

mehrere Defektgrößen abgeleitet.

AE-sensing for varying

processing quality

Data acquisition &

signal conditioning

Data collection

Time-domain signal

Flow chart of ML process

The ML model is trained to differentiate

between acoustic features of different process

qualities. The probability of detection for

several defect sizes was derived from this

classification capability.

Time-frequency spectrum

Training data set

Feature extraction

Testing data set

Data transformation &

feature extraction

ML algorithm training

& testing

Training feature classification

Output trained ML model

Evaluation of classification

performance

Estimate of probability of

detection

ML algorithm

evaluation

Detektionswahrscheinlichkeit für variierende Defektgrößen

Das Potenzial, Defekte in-situ mittels Akustischer Emission (AE) zuverlässiger zu erkennen als mit etablierter

ex-/in-situ Computer-/Optischer Tomographie (CT/OT), könnte seitens Sensorik, ML und Abstufung untersuchter

Qualitätslevel noch erhöht werden.

Probability of detection for

varying defect sizes

The potential of detecting defects in-situ more reliably

by using acoustic emission (AE) rather than established

ex-/in-situ computer/optical tomography (CT/OT) could

be increased on the part of sensors, ML, and gradation

of the examined quality level.

Probability of detection

1.0

0.8

0.6

0.4

0.2

0.0

0.05 0.10 0.15 0.20 0.25 0.30 0.35

Defect size [mm]

AE

AE 95 % Confidence Interval (C.I.)

CT

CT 95 % C.I.

OT

OT 95 % C.I.

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