Chen, H., Liao, K., and Tian, T., "A Numerical and Experimental Study of Twin-land Oil Control Ring Friction in Internal Combustion Engines Part 2," SAE Technical Paper 2012-01-1321, 2012, doi:10.4271/2012-01-1321.
A twin-land oil control ring (TLOCR) model is used to evaluate TLOCR friction and the results are compared to the experiment measurement in a single cylinder floating liner engine under motoring condition. The model is based on a correlation between the hydrodynamic pressure and film thickness, which is generated using a deterministic model. The well-known three-regime lubrication is predicted with the model for ring with different ring tensions under various engine running conditions. A good match is found for the model and experiment results.