Simulation Study on Bearing Lubrication Mechanism and Friction Characteristics of the Biomimetic Non-Smooth Surface of a Cross-Scale, Second-Order Compound Microstructure

The reasonable design of biomimetic non-smooth surfaces is a novel and effective way to solve problems such as the poor lubricity serious friction wear pairs seawater axial piston pumps. Inspired by cross-scale, second-order compound microstructures on some living organisms, hydrodynamic lubrication model slipper pair with surface featuring spherical pits containing convex hulls was built. This study analyzed bearing mechanism characteristics microstructure from microflow perspective via CFD method optimized working geometric parameters using hybrid orthogonal test scheme. study’s results show that can produce superimposed pressure effect improve capacity film pair, reducing coefficient. orders factors (the parameter parameters) under multiple indices total pressure-bearing coefficient) were found. optimal combination pit first order diameter 0.7 mm, depth-to-diameter ratio 0.1, an area rate 20%, arrangement angle ?/3 hull second 0.13 0.3. Compared smooth first-order, microstructure, has 11.0% 8.9% higher capacity, respectively, coefficient decreased 9.5% 5.4%, respectively.