A numerical procedure for calculating roughness parameters for the Greenwood-Tripp model of asperity contact based on 3D measurements
David García-Rodiño, Javier Blanco-Rodríguez, Martí Cortada-García, Silvia Fernández, Jacobo Porteiro
Abstract
This study introduces the proposed deterministic methodology for calculating the roughness parameters involved in the Greenwood-Tripp equation for asperity contact pressure. A robust methodology that takes into consideration the maximum possible peak morphology and establishes more stringent calculation conditions is proposed. The stability of the proposed method is examined on various samples taken from different engine components using an optical interferometer. The roughness parameters obtained from different methodologies and using different optical interferometer resolutions are compared, and then, these parameters are introduced into simulation model that employs the Greenwood-Tripp equation. The results demonstrate the sensitivity of the simulation model to the roughness parameters used. • A novel method for calculating the roughness parameters for the Greenwood-Tripp model. • The proposed method employs a more detailed peak morphology and stricter conditions. • Comparison of the robustness of the proposed method with those of previous methods. • Virtual test rig simulation for friction torque and maximum asperity contact pressure. • High sensitivity of the simulation results to different roughness parameters.