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Application of Machine Learning to Rotorcraft Health Monitoring

Application of Machine Learning to Rotorcraft Health Monitoring

          
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About the Book

Machine learning is a powerful tool for data exploration and model building with large data sets. This project aimed to use machine learning techniques to explore the inherent structure of data from rotorcraft gear tests, relationships between features and damage states, and to build a system for predicting gear health for future rotorcraft transmission applications. Classical machine learning techniques are difficult, if not irresponsible to apply to time series data because many make the assumption of independence between samples. To overcome this, Hidden Markov Models were used to create a binary classifier for identifying scuffing transitions and Recurrent Neural Networks were used to leverage long distance relationships in predicting discrete damage states. When combined in a workflow, where the binary classifier acted as a filter for the fatigue monitor, the system was able to demonstrate accuracy in damage state prediction and scuffing identification. The time dependent nature of the data restricted data exploration to collecting and analyzing data from the model selection process. The limited amount of available data was unable to give useful information, and the division of training and testing sets tended to heavily influence the scores of the models across combinations of features and hyper-parameters. This work built a framework for tracking scuffing and fatigue on streaming data and demonstrates that machine learning has much to offer rotorcraft health monitoring by using Bayesian learning and deep learning methods to capture the time dependent nature of the data. Suggested future work is to implement the framework developed in this project using a larger variety of data sets to test the generalization capabilities of the models and allow for data exploration. Cody, Tyler and Dempsey, Paula J. Glenn Research Center NASA/TM-2017-219408, E-19307, GRC-E-DAA-TN35995


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Product Details
  • ISBN-13: 9781794440708
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 279 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1794440704
  • Publisher Date: 22 Jan 2019
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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