Zobrazeno 1 - 10
of 48
pro vyhledávání: '"David G. Lewicki"'
Publikováno v:
Journal of the American Helicopter Society. 58:17-28
Dynamic simulations and experimental validation tests were performed on a two-stage, two-speed gearbox. The gearbox was driven by two electromagnetic motors and had two electromagnetic, multidisk clutches to control output speed. A dynamic model of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b1eeb32b65190a414b2fe95c386018a3
https://doi.org/10.4050/jahs.58.012004
https://doi.org/10.4050/jahs.58.012004
Publikováno v:
Tribology Transactions. 50:507-516
Two computational models to determine the fatigue life and reliability of a commercial turboprop gearbox are compared with each other and with field data. These models are (1) Monte Carlo simulation of randomly selected lives of individual bearings a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c5b6f4d251eb55d86bba62c75e9b9c3
https://doi.org/10.1080/10402000701613799
https://doi.org/10.1080/10402000701613799
Autor:
David G. Lewicki, Anthony R. Ingraffea, Ani Ural, Joaquim Bento Cavalcante Neto, Gerd Heber, Paul A. Wawrzynek
Publikováno v:
Engineering Fracture Mechanics. 72:1148-1170
This paper summarizes new results for predicting crack shape and fatigue life for a spiral bevel pinion gear using computational fracture mechanics. The predictions are based on linear elastic fracture mechanics theories combined with the finite elem
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::605d7323f6a602454c8724ac66aacecd
https://doi.org/10.1016/j.engfracmech.2004.08.004
https://doi.org/10.1016/j.engfracmech.2004.08.004
Autor:
David G. Lewicki
Publikováno v:
Journal of the American Helicopter Society. 47:64-72
Design guidelines have been established to prevent catastrophic rim fracture failure modes when considering gear tooth bending fatigue. Analysis was performed using the finite element method with principles of linear elastic fracture mechanics. Crack
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::88f604e9d338dbf34515fb0e274d55d5
https://doi.org/10.4050/jahs.47.64
https://doi.org/10.4050/jahs.47.64
Publikováno v:
Engineering Fracture Mechanics. 68:53-76
The majority of helicopter transmission systems utilize spiral bevel gears to convert the horizontal power from the engine into vertical power for the rotor. Due to the cyclical loading on a gear's tooth, fatigue crack propagation can occur. In rotor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3beb91f317fd369961cf03161f4dc962
https://doi.org/10.1016/s0013-7944(00)00089-8
https://doi.org/10.1016/s0013-7944(00)00089-8
Autor:
David G. Lewicki
Publikováno v:
The Proceedings of the JSME international conference on motion and power transmissions. :518-523
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9ccef7fb1cd5bc6b8859c26da62a6f80
https://doi.org/10.1299/jsmeimpt.ii.01.202.518
https://doi.org/10.1299/jsmeimpt.ii.01.202.518
Publikováno v:
Journal of the American Helicopter Society. 45:125-136
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f43255a15c69033ce214f064ce63fe56
https://doi.org/10.4050/jahs.45.125
https://doi.org/10.4050/jahs.45.125
Publikováno v:
Journal of the American Helicopter Society. 45:118-124
Experimental durability tests were performed on carburized and ground AIS19310 steel face gears. The tests were in support of a Defense Advanced Research Projects Agency (DARPA) Technology Reinvestment Program (TRP) to enhance face-gear technology. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a1fd26ee8b4140d6348211ae334f0112
https://doi.org/10.4050/jahs.45.118
https://doi.org/10.4050/jahs.45.118
Autor:
Roberto Ballarini, David G. Lewicki
Publikováno v:
Tribotest. 5:157-172
Analytical and experimental studies were performed to investigate the effect of gear rim thickness on crack propagation life. The FRANC (FRacture ANalysis Code) computer program was used to simulate crack propagation. The FRANC program used principle
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::537849a555bb9374a67673da1546cdeb
https://doi.org/10.1002/tt.3020050206
https://doi.org/10.1002/tt.3020050206
Autor:
David G. Lewicki, James J. Zakrajsek
Publikováno v:
Tribotest. 4:407-422
Results of using vibration based methods to detect gear tooth fatigue cracks are presented. An experimental test rig was used to fail a number of spur gear specimens through bending fatigue. The gear tooth fatigue crack in each test was initiated thr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9870078b37ee28067aa37425f0bcbce5
https://doi.org/10.1002/tt.3020040407
https://doi.org/10.1002/tt.3020040407