J
Jonathan Keller
Researcher at National Renewable Energy Laboratory
Publications - 84
Citations - 1464
Jonathan Keller is an academic researcher from National Renewable Energy Laboratory. The author has contributed to research in topics: Turbine & Bearing (mechanical). The author has an hindex of 18, co-authored 73 publications receiving 1158 citations. Previous affiliations of Jonathan Keller include Office of Scientific and Technical Information & École centrale de Lyon.
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Material Wear and Fatigue in Wind Turbine Systems
TL;DR: In this article, the authors examined contact failures of bearings from wind turbine gearboxes and observed the localized microstructural change, known as white etching area (WEA), in order to guide the development of lasting solutions to a pressing problem.
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Detection of a fatigue crack in a UH-60A planet gear carrier using vibration analysis
D. M. Blunt,Jonathan Keller +1 more
TL;DR: In this paper, two new methods of detecting fatigue cracks in a planet carrier of an epicyclic transmission were developed using vibration data from a number of UH-60A Black Hawk helicopter main transmissions.
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Equipment health diagnosis and prognosis using hidden semi-Markov models
TL;DR: The HSMM methodology offers two significant advantages over the HMM methodology in equipment health diagnosis and prognosis: (1) it overcomes the modeling limitation of HMM due to the Markov property and therefore improves the power in diagnosis, and (2) it can be directly used for prognosis.
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Additive manufacturing of soft magnets for electrical machines—a review
Tej N. Lamichhane,Latha Sethuraman,A. Dalagan,Haobo Wang,Haobo Wang,Jonathan Keller,Mariappan Parans Paranthaman,Mariappan Parans Paranthaman +7 more
TL;DR: In this paper, the state of the art in printability and performance characteristics of soft magnetic materials for electric machines is summarized and discussed in terms of price, printability, weight, and performance of the electrical machines.
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Nonlinear dynamics and stability of wind turbine planetary gear sets under gravity effects
TL;DR: In this article, a modified harmonic balance method that includes simultaneous excitations is applied to a lumped-parameter planetary gear model including gravity, fluctuating mesh stiffness, bearing clearance, and nonlinear tooth contact to obtain the dynamic response of the system.