Early detection of combustion instability from hi-speed flame images via deep learning and symbolic time series analysis

Soumalya Sarkar, Kin G. Lore, Soumik Sarkar, Vikram Ramanan, Satyanarayanan R. Chakravarthy, Shashi Phoha, Asok Ray

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Scopus citations

Abstract

Combustion instability, characterized by self-sustained, large-amplitude pressure oscillations and periodic shedding of coherent vortex structures at varied spatial scales, has many detrimental effects on flight-propulsion dynamics and structural integrity of gas turbine engines. Hence, its early detection is one of the important tasks in engine health monitoring and prognostics. This paper proposes a dynamic data-driven approach, where a large volume of sequential hi-speed (greyscale) images is used to analyze the temporal evolution of coherent structures in combustion chamber for early detection of combustion instability at various operating conditions. The proposed hierarchical approach involves extracting low-dimensional semantic features from images using Deep Neural Networks followed by capturing the temporal evolution of the extracted features using Symbolic Time Series Analysis (STSA). Extensive experimental data have been collected in a swirl-stabilized dump combustor at various operating conditions for validation of the proposed approach. Intermediate layer visualization of deep learning reveals that meaningful shape-features from the flame images are extracted, which enables the temporal modeling layer to enhance the class separability between stable and unstable regions. At the same time, the semantic nature of intermediate features enables expert-guided data exploration that can lead to better understanding of the underlying physics. To the best of the authors knowledge, this paper presents one of the early applications of the recently reported Deep Learning tools in the area of prognostics and health management (PHM).

Original languageEnglish (US)
Title of host publicationPHM 2015 - Proceedings of the Annual Conference of the Prognostics and Health Management Society 2015
EditorsMatthew J. Daigle, Anibal Bregon
PublisherPrognostics and Health Management Society
Pages353-362
Number of pages10
ISBN (Electronic)9781936263202
StatePublished - Jan 1 2015
Event2015 Annual Conference of the Prognostics and Health Management Society, PHM 2015 - San Diego, United States
Duration: Oct 18 2015Oct 22 2015

Publication series

NameProceedings of the Annual Conference of the Prognostics and Health Management Society, PHM
ISSN (Print)2325-0178

Other

Other2015 Annual Conference of the Prognostics and Health Management Society, PHM 2015
CountryUnited States
CitySan Diego
Period10/18/1510/22/15

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Electrical and Electronic Engineering
  • Health Information Management
  • Computer Science Applications

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