RINGPAK - ring dynamics

RINGPAK - ring dynamics

Ring dynamics

RINGPAK simulates the motion of each separate ring on the piston assembly, based upon an axis-symmetric assumption. The ring motion is decomposed into twist, axial and radial motions. The effects of the surrounding gas pressure, boundary lubrication, hydrodynamic lubrication, system friction and inertia are taken into account in force and momentum balances.

Sealing calculations can be performed based upon detailed gas-flow analysis through the ring pack. From these studies, blow-by and blow-back values can be predicted. Using this methodology, RINGPAK forms an interconnected system of gas volumes. The gas flow between these volumes is controlled by either the ring motion or by the conformability of the rings to the liner body during deformation.

RINGPAK includes two flow models, one based upon isentropic conditions and the other based upon compressible isothermal flow. Each flow model can either be selected explicitly, or RINGPAK can be left to decide the best solution method based upon flow parameters.

Key features

  • Axis-symmetric 2D treatment, including 3D features for bore distortion, ring conformability, crown shape and crown thermal distortion
  • Mass-conserving hydrodynamic lubrication model
  • Boundary lubrication model
  • Channel flow and Orifice flow inter-ring gas dynamics
  • Ring-liner conformability
  • Different oil supply modes

Relevant resources

Ricardo Software Newsletter, Issue 2 2015

Ricardo Software Newsletter, Issue 2 2015

Download
Find out more
Application of dynamic analysis in piston assembly design

Application of dynamic analysis in piston assembly design

Application of dynamic analysis in piston assembly design using PISDYN and... Download
Find out more
Diesel engine piston assembly for friction reduction

Diesel engine piston assembly for friction reduction

This presentation covers optimization of a diesel engine piston assembly for... Download
Find out more
Predicted effects of cylinder kit wear on blowby and oil consumption

Predicted effects of cylinder kit wear on blowby and oil ...

This paper explores the effect of power cylinder component wear by using a... Download
Find out more
Lube oil consumption analysis of DI engine

Lube oil consumption analysis of DI engine

The sensitivity study was done to reveal the trend of oil consumption with top... Download
Find out more