Active lubrication interfaces with tunable micro-textures

buir.advisorTemizer, İlker
dc.contributor.authorPekol, Sena
dc.date.accessioned2023-08-11T10:30:44Z
dc.date.available2023-08-11T10:30:44Z
dc.date.copyright2023-07
dc.date.issued2023-07
dc.date.submitted2023-08-07
dc.departmentDepartment of Mechanical Engineering
dc.descriptionCataloged from PDF version of article.
dc.descriptionThesis (Master's): Bilkent University, Mechanical Engineering, İhsan Doğramacı Bilkent University, 2023.
dc.descriptionIncludes bibliographical references (leaves 68-74).
dc.description.abstractThis thesis investigates a homogenization-based space-time optimization framework in the context of hydrodynamic lubrication in order to design micro-textures which can be actively controlled through external stimuli. The response at the interface is established via the Reynolds equation to describe the physics of the lubrication for a small film thickness. Subsequently, the interface is subjected to multiscale analysis and effective macroscopic parameters are derived via homogenization method. In order to calculate the macroscopic parameters, Finite Element (FE) formulation is employed and the implementation of the parameters in the in-house FE code is demonstrated. For the suboptimality problem due to typically employed fixed unit cell in FE analysis, a geometry optimization scheme is developed. Thereafter, a sensitivity based topology optimization framework is introduced with the aim of identifying the spatial distribution and temporal variation of the micro-texture, and the shape of the unit cell which together help achieve the targeted lubrication response. The performance of the employed framework is assessed through objectives which ultimately determine the macroscopic flux at the interface as well as the frictional traction that is associated with the macroscopic dissipation at the interface. Finally, three-dimensional realizations are constructed for active micro-textures by adopting a readily deployable experimental architecture.
dc.description.degreeM.S.
dc.description.statementofresponsibilityby Sena Pekol
dc.embargo.release2024-02-07
dc.format.extentxiv, 91 leaves : color illustrations, charts ; 30 cm.
dc.identifier.itemidB16238
dc.identifier.urihttps://hdl.handle.net/11693/112644
dc.language.isoEnglish
dc.publisherBilkent University
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectTopology optimization
dc.subjectHomogenization
dc.subjectHydrodynamic lubrication
dc.subjectMicro-texture design
dc.subjectTunability
dc.titleActive lubrication interfaces with tunable micro-textures
dc.title.alternativeAyarlanabilir mikro-desen tabanlı aktif yağlama arayüzeyleri
dc.typeThesis
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