744 research outputs found
A Machine Learning Approach for Gearbox System Fault Diagnosis
This study proposes a fully automated gearbox fault diagnosis approach that does not require knowledge about the specific gearbox construction and its load. The proposed approach is based on evaluating an adaptive filter's prediction error. The obtained prediction error's standard deviation is further processed with a support-vector machine to classify the gearbox's condition. The proposed method was cross-validated on a public dataset, segmented into 1760 test samples, against two other reference methods. The accuracy achieved by the proposed method was better than the accuracies of the reference methods. The accuracy of the proposed method was on average 9% higher compared to both reference methods for different support vector settings
30th International Conference on Condition Monitoring and Diagnostic Engineering Management (COMADEM 2017)
Proceedings of COMADEM 201
Advanced Fault Diagnosis and Health Monitoring Techniques for Complex Engineering Systems
Over the last few decades, the field of fault diagnostics and structural health management has been experiencing rapid developments. The reliability, availability, and safety of engineering systems can be significantly improved by implementing multifaceted strategies of in situ diagnostics and prognostics. With the development of intelligence algorithms, smart sensors, and advanced data collection and modeling techniques, this challenging research area has been receiving ever-increasing attention in both fundamental research and engineering applications. This has been strongly supported by the extensive applications ranging from aerospace, automotive, transport, manufacturing, and processing industries to defense and infrastructure industries
Domain knowledge-informed Synthetic fault sample generation with Health Data Map for cross-domain Planetary Gearbox Fault Diagnosis
Extensive research has been conducted on fault diagnosis of planetary
gearboxes using vibration signals and deep learning (DL) approaches. However,
DL-based methods are susceptible to the domain shift problem caused by varying
operating conditions of the gearbox. Although domain adaptation and data
synthesis methods have been proposed to overcome such domain shifts, they are
often not directly applicable in real-world situations where only healthy data
is available in the target domain. To tackle the challenge of extreme domain
shift scenarios where only healthy data is available in the target domain, this
paper proposes two novel domain knowledge-informed data synthesis methods
utilizing the health data map (HDMap). The two proposed approaches are referred
to as scaled CutPaste and FaultPaste. The HDMap is used to physically represent
the vibration signal of the planetary gearbox as an image-like matrix, allowing
for visualization of fault-related features. CutPaste and FaultPaste are then
applied to generate faulty samples based on the healthy data in the target
domain, using domain knowledge and fault signatures extracted from the source
domain, respectively. In addition to generating realistic faults, the proposed
methods introduce scaling of fault signatures for controlled synthesis of
faults with various severity levels. A case study is conducted on a planetary
gearbox testbed to evaluate the proposed approaches. The results show that the
proposed methods are capable of accurately diagnosing faults, even in cases of
extreme domain shift, and can estimate the severity of faults that have not
been previously observed in the target domain.Comment: Under review / added arXiv identifie
PHM survey: implementation of signal processing methods for monitoring bearings and gearboxes
The reliability and safety of industrial equipments are one of the main objectives of companies to remain competitive in sectors that are more and more exigent in terms of cost and security. Thus, an unexpected shutdown can lead to physical injury as well as economic consequences. This paper aims to show the emergence of the Prognostics and Health Management (PHM) concept in the industry and to describe how it comes to complement the different maintenance strategies. It describes the benefits to be expected by the implementation of signal processing, diagnostic and prognostic methods in health-monitoring. More specifically, this paper provides a state of the art of existing signal processing techniques that can be used in the PHM strategy. This paper allows showing the diversity of possible techniques and choosing among them the one that will define a framework for industrials to monitor sensitive components like bearings and gearboxes
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