Precision Engineering ​Research Group

Yılmaz Laboratory

About the Research Group

Precision Engineering Research Group consits two distinct laboratories (Tanaka & Yılmaz labs), which investigate mechanics and physics of material surface phenomena at different length scales ranging from the nano to macroscopic scales. Our research activities focus a wide range of topics including tribology (e.g. friction, wear, lubrication), manufacturing  of CFRP materials (e.g. machining and molding/forming - PI Prof. Tanaka*) ​incorporated with CAD・CAE・CAM tools. The group conducts experiments and numerical simulations to translate scientific understanding into novel manufacturing methods & mathematical models.

CFRP Machining*

- Optimization of CFRTP turning process
- Evaluation of machinability for CFRP milling process by considering fiber orientation

Surface finishing*

- Analytical study of diamond tip burnishing process
- Development of in-process temperature measurement methodof burnishing by CVD tools

Tribology

- Evaluation of micro texturing effects on reducing the friction coefficient on sliding surfaces

Molding/Forming of CFRP*

- Incremental forming of CFRTP on the basis of 3D-CAD data
- Development of press molding preform design and fabrication method with open-up diagram for CFRP

Micromachining

- Evaluation of utilizing Electrical Discharge Machining to create micro-scale textures on sliding surfaces

Deep Learning

- Development of heat transfer models based on DL frameworks to utilize nucleate boiling phenomenon 

Research Outline

Our modeling and experimental methodology aim to contribute to the advancement of general knowledge in engine tribology & engine/battery cooling systems. From tribological approach, in-house built experimental apparatus and CFD simulation results are being adapted to next-generation ICEs'. Piston-Liner Interaction accounts of around 10% of mechenical losses in conventional ICEs, by  decreasing the frictional losses created during the reciprocating motion of the piston, next-generation ICEs (fueled by carbon free fuels such as ammonia/hydrogen) can benefit greatly from new tribological technologies. We are also focusing on the effect of surface roughness characteristics on heat transfer enhancement due to nucelate boiling phenomenon by altering bubble generation frequency on a heated surface. EDM is used to create functional surfaces that enhances heat transfer which will be used to minimize the size and weight of the conventional cooling systems from engines/batteries. We are also aiming to utilize deep learning models to further improve our understanding on these topics.

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