Performance study of DTW-based spike measurement anomaly detection in sensors on real-world tests
Résumé
Automated anomaly detection in sensor data plays a crucial role in various applications, including predictive
maintenance, quality control, and prototype testing in the automotive industry. This paper focuses on a specific
type of anomaly, known as “Spikes”, which are sharp, sudden outlier values with no correlation to surrounding
samples. The study presents a novel Dynamic Time Warping (DTW) based technique for detecting these spikes
in online, multi-channel acquisitions during automotive testing. The technique has been validated on a real-
world dataset acquired during a measurement campaign on an electric vehicle. The dataset consists of both
anomalous and non-anomalous signals with varying dynamic ranges, patterns, lengths, and sensor types. The
results show the method’s accuracy in avoiding false positives, such as mistaking spikes for other physical
impulses during the test, like tires squeaking, or any other physical impulse coming from the engine or other
sub-component of the vehicle under test.
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