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Development of a gear-meshing tribology model with application to loss-of-lubrication analysis.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Development of a gear-meshing tribology model with application to loss-of-lubrication analysis./
作者:	Yu, Qingtao.
面頁冊數:	1 online resource (199 pages)
附註:	Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
Contained By:	Dissertation Abstracts International78-05B(E).
標題:	Mechanical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781369405668

Development of a gear-meshing tribology model with application to loss-of-lubrication analysis.
Yu, Qingtao.

Development of a gear-meshing tribology model with application to loss-of-lubrication analysis. - 1 online resource (199 pages)

Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

The dissertation focuses on gear-meshing tribology under the loss-of-lubrication (LoL) condition. A physics-based line-contact tribology model for the entire lubrication regime is developed. The line-contact tribology model is integrated with gear kinematics to establish a gear-meshing tribology model. As the primary application, the gear-meshing tribology model is coupled with a heat transfer model to conduct system-level transient analysis of LoL performance between a pair of spur gears.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369405668Subjects--Topical Terms:

557493
Mechanical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Development of a gear-meshing tribology model with application to loss-of-lubrication analysis.
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245 1 0 $a Development of a gear-meshing tribology model with application to loss-of-lubrication analysis.
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500 $a Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
500 $a Adviser: Liming Chang.
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504 $a Includes bibliographical references
520 $a The dissertation focuses on gear-meshing tribology under the loss-of-lubrication (LoL) condition. A physics-based line-contact tribology model for the entire lubrication regime is developed. The line-contact tribology model is integrated with gear kinematics to establish a gear-meshing tribology model. As the primary application, the gear-meshing tribology model is coupled with a heat transfer model to conduct system-level transient analysis of LoL performance between a pair of spur gears.
520 $a Based on the load sharing between hydrodynamic pressure (fluid) and solid contact, the entire lubrication regime is commonly divided into elasto-hydrodynamic lubrication (EHL), mixed lubrication (ML) and boundary lubrication (BL). To establish a physics-based model, the dissertation further divides the mixed lubrication regime into three sub-regimes: light-mixed lubrication, significant-mixed lubrication and near-boundary lubrication, based on their physical characterizes. A model is developed for the boundary and near-boundary lubrication regimes where the majority of the contact load is supported by solid contact. This model accommodates key thermo-mechanical and tribo-chemistry considerations in these two regimes, including contact temperature, contact friction coefficient, surface boundary films and the boundary film failure criteria. A well-established line-contact tribology model is then reviewed and used to model the EHL and light-mixed lubrication regimes where the contact load is essentially carried by hydrodynamic pressure, and only a small portion of the load is carried by surface asperities (roughness). In the significant-mixed lubrication regime, comparable load is shared between the fluid and the solid. In this regime, the strong coupling between the fluid pressure and the solid contacts makes a sound first-principle model for this regime intractable. A physics-based interpolation method is then developed and applied to approximate the contact and lubrication variables in this regime.
520 $a The contact between unmodified involute spur gear teeth is equivalent to a line contact. During the mesh between a pair of teeth, contact load, surface velocities, and contact geometries of the equivalent line contact vary based on a number of gear configurations. In the gear-meshing tribology model, the meshing kinematics of involute spur gears is integrated with the line-contact tribology such that, with given gear configurations, system operating parameters, gear bulk temperature and lubrication condition, contact variables (pressure, temperature and friction force etc.) can be obtained at every meshing position, thus to evaluate the meshing performance.
520 $a To simulate gearbox loss-of-lubrication performance, the gear-meshing tribology model is coupled with a system heat transfer model to develop a system-level simulation tool, which is used to analyze the interaction between local tooth meshing tribology and global gearbox heat balance. A nominal system based on the LoL test gearbox facility at NASA Glenn Research Center is studied. The simulated results are comparable to the experiment results in both scales and trends. Then a series of parametric analyses are conduced, showing that LoL performance may be improved in various aspects such as gear configurations, material properties and the presence of an emergency lubrication system. These analyses demonstrate the applicability of the gear-meshing tribology model, and the potential of this system level simulation tool in guiding helicopter transmission engineers to better optimize designs in a cost-effective manner.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Mechanical engineering. $3 557493
655 7 $a Electronic books. $2 local $3 554714
690 $a 0548
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The Pennsylvania State University. $3 845556
773 0 $t Dissertation Abstracts International $g 78-05B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10297153 $z click for full text (PQDT)