Research Catalog

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  • Pattern classifier for health monitoring of helicopter gearboxes [microform] / Hsinyung Chin and Kourosh Danai and David G. Lewicki.

    • Text
    • [Washington, DC : National Aeronautics and Space Administration ; St. Louis, Mo.] : US Army Aviation Systems Command ; [Springfield, Va. : National Technical information Service, distributor, [1993]
    • 1993

  • Low-noise, high-strength, spiral-bevel gears for helicopter transmissions [microform] / David G. Lewicki ... [et al.].

    • Text
    • [Washington, DC : National Aeronautics and Space Administration] : U.S. Army Research Laboratory ; [Springfield, Va. : National Technical Information Service, distributor, 1993]
    • 1993

  • Improvements in spiral-bevel gears to reduce noise and increase strength [microform] / David G. Lewicki ... [et al.].

    • Text
    • [Washington, DC] : National Aeronautics and Space Administration ; [Adelphi, Md.] : U.S. Army Research Laboratory ; [Springfield, Va. : National Technical Information Service, distributor, 1994]
    • 1994

  • Diagnosis of helicopter gearboxes using structure-based networks [microform] / Vinay B. Jammu and Kourosh Danai, David G. Lewicki.

    • Text
    • [Washington, DC] : National Aeronautics and Space Administration : U.S. Army Research Laboratory ; [Springfield, Va. : National Technical Information Service, distributor, 1995]
    • 1995

  • Unsupervised pattern classifier for abnormality-scaling of vibration features for helicopter gearbox fault diagnosis [microform] / Vinay B. Jammu, Kourosh Danai, and David G. Lewicki.

    • Text
    • [Washington, DC : National Aeronautics and Space Administration ; Springfield, Va. : National Technical Information Service, distributor, 1996]
    • 1996

  • Three-dimensional gear crack propagation studies [microform] / David G. Lewicki ... [et al.].

    • Text
    • [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center ; [Springfield, Va. : National Technical Information Service, distributor, 1998]
    • 1998

  • Evaluation of carburized and ground face gears [microform] / David G. Lewicki ... [et al.].

    • Text
    • [Cleveland, Ohio] : National Aeronautics and Space Administration, Glenn Research Center ; [Springfield, Va. : National Technical Information Service, distributor, 1999]
    • 1999

  • Planetary gearbox fault detection using vibration separation techniques / David G. Lewicki ... [and others] ; prepared for the 67th Annual Forum and Technology Display (Forum 67) sponsored by the American Helicopter Society (AHS), Virginia Beach, Virginia, May 3-5, 2011.

    • Text
    • Cleveland, Ohio : National Aeronautics and Space Administration, Glenn Research Center, [2011]
    • 2011
    • 1 Resource

    Available Online

    https://purl.fdlp.gov/GPO/gpo22700

  • Improving the performance of the structure-based connectionist network for diagnosis of helicopter gearboxes / Vinay B. Jammu and Kourosh Danai, David G. Lewicki.

    • Text
    • Cleveland, Ohio : National Aeronautics and Space Administration, Lewis Research Center : U.S. Army Research Laboratory, January 1997.
    • 1997-1
    • 1 Resource

    Available Online

    https://purl.fdlp.gov/GPO/gpo72098

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