The friction coefficient in mixed lubrication depends on the real contact and lubrication state, which limits the accuracy of sealing performance prediction. This study aims to propose a lubrication-state-based correction method for the equivalent friction coefficient in reciprocating seals.
A mixed-lubrication model for a bore-type Glyd ring is coupled with finite element analysis. The equivalent friction coefficient is iteratively updated using the friction force calculated from the lubrication model, enabling it to vary with the operating and lubrication conditions.
The correction becomes more important under favorable lubrication and high-pressure conditions. Experiments on a custom-built test rig show that, at 300 mm/min and pressures of 5, 10 and 20 MPa, the corrected model reduces the friction-force prediction error by 5.7, 3.0 and 8.7 percentage points, respectively.
This study establishes an iterative correction framework for the equivalent friction coefficient by coupling mixed lubrication analysis with finite element contact analysis. The method provides a basis for more reliable friction prediction and sealing performance evaluation.
