Piston Secondary Dynamics Considering Elastohydrodynamic Lubrication

2007-01-1251

04/16/2007

Event
SAE World Congress & Exhibition
Authors Abstract
Content
An analytical method is presented in this paper for simulating piston secondary dynamics and piston-bore contact for an asymmetric half piston model including elastohydrodynamic (EHD) lubrication at the bore-skirt interface. A piston EHD analysis is used based on a finite-difference formulation. The oil film is discretized using a two-dimensional mesh. For improved computational efficiency without loss of accuracy, the Reynolds’ equation is solved using a perturbation approach which utilizes an “influence zone” concept, and a successive over-relaxation solver. The analysis includes several important physical attributes such as bore distortion effects due to mechanical and thermal deformation, inertia loading and piston barrelity and ovality. A Newmark-Beta time integration scheme combined with a Newton-Raphson linearization, calculates the piston secondary motion. The EHD behavior is coupled with a contact algorithm at the piston-bore interface as well as the piston secondary dynamics. The effects of some piston design parameters such as piston pin offset, clearance and location of cylinder peak pressure are investigated.
Meta TagsDetails
DOI
https://doi.org/10.4271/2007-01-1251
Pages
18
Citation
Shah, P., Mourelatos, Z., and Patel, P., "Piston Secondary Dynamics Considering Elastohydrodynamic Lubrication," SAE Technical Paper 2007-01-1251, 2007, https://doi.org/10.4271/2007-01-1251.
Additional Details
Publisher
Published
Apr 16, 2007
Product Code
2007-01-1251
Content Type
Technical Paper
Language
English