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DISSERTATIONS
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Author: |
Agouridas Konstantinos |
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Title: |
Complete three dimensional elastohydrodynamic lubrication under
complex kinematics of general geometry bodies |
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Abstract: |
The present
thesis deals with the problem of elastohydrodynamic lubrication
(E.H.L.). Specifically, this work aims to the complete numerical
simulation of elastohydrodynamic contacts. The thesis begins with an
introduction to the subject, followed by historical review of the
field of E.H.L. which covers the evolution of E.H.L. theory, the
knowledge of lubricant properties and numerical methods applied on
this problem. From this review, has been concluded that despite the
important progress that has been made over the years, a general
model for simulating E.H.L. is missing from the literature. The next
step was the derivation of the governing equations of the problem.
Goal of this process was to build a general mathematical model
capable of describing the majority of cases of E.H.L. found in
mechanical engineering applications. The mathematical model was
properly non-dimensionalized and discretized. Continuing, numerical
procedures applied to the discreet equations and an arithmetic model
was developed. The reliability of the model was verified through
comparison of its results with experimentally measured data. In
order to point out the capabilities of the developed model several
common and special cases of E.H.L. were simulated. The thesis
concludes that for first time was presented a three-dimensional
numerical general geometry model that can deal with E.H.L. and
simultaneously includes in the solution process all the following
features that affect the contact. Surface micro-structure,
roughness, Misalignment errors, Starved lubrication, Thermal
analysis, Transient solution, Complex contact body kinematics,
Complete oil properties model, all the following properties are
taken into account, viscosity, density, special heat capacity,
thermal conductivity, rheological laws |
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