Standard
The Consideration of Viscosity Based, Pressure-Viscosity Coefficient Determination Methods
2024-10-07
WIP
AIR8638
Captures the identification and impact of the identified scatter in reported Pressure-Viscosity Coefficients (PVC) using SAE ARP6157 optical regression methods. This document will inform component designers of the shift in direction from optically regressed to viscosity based PVCs within the SAE E34 committee. Using common bearing and gear analysis calculations, the impact of the methods is discussed. In addition, a discussion on the various definitions and uses of the PVC are offered. A subset of equations that commonly utilize the various definitions will be provided. With the development of a new viscosity based PVC determination method, additional rheological parameters and coefficients will become available to component designers. Their consideration for component design is offered.