PISDYN - piston dynamics

PISDYN - piston dynamics

Piston dynamics

PISDYN calculates the secondary motions of the piston assembly by solving for the forces and moments of the piston/liner system and how these interact with the lubrication at the component interfaces throughout the engine cycle. 

The lubrication model includes the effects of both hydrodynamic and boundary lubrication, as well as accounting for the elasticity of the piston skirt and cylinder liner. PISDYN also allows for a full hierarchy of solution levels, ranging from rigid through compliant to fully dynamic components, and from dry through partially flooded to full flooded oil supply zones.

Key features

  • Mass-conserving Elastohydrodynamic Lubrication (EHL) model
  • Boundary lubrication model
  • Average flow model (flow coefficients)
  • Dry, partially and fully flooded oil supply options
  • Rigid, compliant and dynamic piston and liner model types
  • Prediction of lubricated extend and cavitated regions
  • Modelling lubricated, unlubricated zones and cut-outs
  • Bore distortion and bore gas pressure deformation
  • Piston skirt thermal, inertial and gas pressure deformation
  • Piston crown lands, skirt and bore profiles
  • Spatial varying viscosity
  • Crown lands contact model
  • Simplified top ring model
  • Animated results on piston skirt, cylinder liner, wristpin bearings and crown lands
  • Complete cycle results plot

Relevant resources

Piston top land contact analysis

Piston top land contact analysis

The goal was to optimize piston top land dimensions for a 3.3L, Diesel engine... Download
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Use of PISDYN in engine development cycle

Use of PISDYN in engine development cycle

This presentation reviews key components affecting the performance of power train... Download
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Skirt shape optimisation for a lightweight gasoline TGDI engine

Skirt shape optimisation for a lightweight gasoline TGDI ...

The DOE approach gave a good spread of investigative cases encompassing the bulk... Download
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A DOE procedure for designing piston skirt profiles

A DOE procedure for designing piston skirt profiles

PISDYN simulation software is used by ACL Piston Products to optimise the design... Download
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Influence of piston cold profile and piston cold clearance

Influence of piston cold profile and piston cold clearance

Influence of piston cold profile and piston cold clearance on scuffing, friction... Download
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Case study using PISDYN of the effect on piston performance

Case study using PISDYN of the effect on piston performance

PISDYN simulation software is used by ACL Piston Products to optimise in the... Download
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