**Engines Engines**

Chao Cheng Chao Cheng

Additional information is available at the end of the chapter Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/intechopen.69762

#### **Abstract**

Piston ring pack is one of the most critical components for engine performance, durabil‐ ity, and emission. It has become a decisive factor for engine life. From previous study, a three‐dimensional ring model has been developed using finite element method to study the interactions between the ring‐cylinder liner and the ring‐groove side interfaces. The ring‐cylinder and ring‐groove side contacts are modeled using finite element method based on penalty method optimization algorithm. Ring deformation, reaction forces at the ring sides and ring face, and the twist angles along the entire ring circumference are obtained from the model. However, the dynamic behavior of the ring is still less under‐ stood. In this study, the dynamic response of the ring over an engine cycle is studied for a second compression ring with a non‐symmetric cross section.

**Keywords:** power cylinder system, piston, ring pack, cylinder liner, friction, wear, oil consumption, dynamics, finite element, optimization, internal combustion engines
