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Joined 2026-09-21 Message
Tagged: Work by David G. Lewicki
Title-page byline: David G.Lewicki, Nicholas A.Lambert and Robert S.Wagoner, April2015. Printed p.21, equations(1)–(2), explains rotating-sensor sidebands at1957±103Hz; Figure20, printed p.23, compares radial and tangential channels.
Printed pp. 1–5 identify the author affiliations, test objective and notched pinion; Figure 7, printed p. 7, and “MEMS Results”, printed p. 19, give the radial/tangential sensor layout and channel combinations. Printed pp. 24–25 compare reconstructed and measured rotation timing for synchronous averaging; Conclusions, printed p. 30, point 5, states the limited interval between detection and actual tooth fracture.
Author-organization-hosted version: first-page bylines are David G. Lewicki, Nick Lambert and Robert Wagoner. The formal NASA report uses Nicholas A. Lambert and Robert S. Wagoner. These parallel versions establish abbreviated byline variants without supplying fuller middle names.
Primary title page gives David G. Lewicki, Paula J. Dempsey, Gregory F. Heath and Perumal Shanthakumaran, October 2009. Printed pp. 1–3 describe the 24 gear sets, test facility, vibration acquisition and oil-debris instrumentation; pp. 4–5 relate inspection observations to detection performance.
Gear Technology published version, November/December 2010, printed pp. 48–59. The article repeats the four original bylines. Author biographies on printed p. 59 document Paula J. Dempsey's NASA aerospace-research work, Gregory F. Heath's Boeing rotorcraft-drive role, and Perumal Shanthakumaran's Boeing condition-monitoring role as of that publication. Initial-only names are retained as printed.
Primary title page identifies David G. Lewicki and June 1986. The NTRS identifier starts with 1987 but the publication date is 1986. Summary, printed p. 1, and Summary of Results, printed p. 11, describe calculated dynamic tooth loads and predicted pitting-fatigue life for low-contact-ratio spur gears.
Summary and Introduction, printed p. 1 (PDF p. 3), specify the modified TELSGE tooth-stiffness model and stiffness–dynamic-load iteration; tooth stiffness and dynamic loads were calculated as functions of contact position and speed. These are model calculations, distinct from the 2009 endurance-monitoring experiment cited separately.