Naslov
Simulation of piston and piston ring dynamics

Autori
Putarek, Ljudevit

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, diplomski

Fakultet
Fakultet strojarstva i brodogradnje

Mjesto
Zagreb

Datum
17.05

Godina
2019

Stranica
194

Mentor
Kozarac, Darko

Ključne riječi
piston group friction ; AVL FRISC measurement ; AVL EXCITE™ Piston&Ring ; AVL EXCITE™ Power Unit ; FMEP ; LOC ; blow-by ; friction force ; side force ; tangential force on piston ring ; 2D and 3D simulation solver ; REVO ; EHD ; tuning parameters

Sažetak
Piston group is the main contributor to friction with an amount of 40%-50% of the total IC engine friction. The market is looking for efficient friction reduction methods without drawbacks in durability and NVH. In light of this, efficient parameter studies and optimization processes in multibody dynamics simulation are becoming increasingly important and must be setup. The aim of this thesis is to investigate the differences in the results of simulation and measurement on the AVL FRISC engine. The AVL FRISC (FRIction Single Cylinder) engine is a research IC engine designed for the investigation of piston and piston ring dynamics in view of measuring friction force side force, friction mean effective pressure (FMEP), lube oil consumption (LOC) and blow-by values. Simulation models are built in the AVL EXCITE™ Piston&Ring and AVL EXCITE™ Power Unit software’s. In EXCITE™ Piston&Ring, models with two different piston ring packages (basic and low friction package) are created for different simulation solvers: simplified (2D) and advanced (3D) solver. The differences between the basic and low friction ring package is in the tangential force. The results of LOC, blow-by, piston ring dynamics and piston ring friction losses are given by the AVL EXCITE™ Piston&Ring software. To investigate the total FMEP values of piston group, friction force and side force, AVL EXCITE™ Power Unit models are created for a basic and low friction package. Simulation models are also created with a simplified and advanced approach. Revolute Joints (REVO) are used in the simplified approach, whereas Elasto-Hydrodynamic journal sliding bearing (EHD2) is used in the advanced approach. The results of piston dynamics, piston friction losses, friction and side force are presented. For the simulated AVL FRISC engine, the measurements of LOC, blow-by, FMEP, friction and side forces are available and simulation results are compared with the available measurements. Finally, a study on tuning parameters for results correlation and sensitivity of tuning parameters is presented.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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