Abstract
Abstract An optimization model is established for the multi-scale textured cylinder/valve plate interface in axial piston pumps by coupling the lubrication model of the oil film, the cylinder dynamic model and the multi-objective optimization model based on the Non-dominated Sorting Genetic Algorithm (NSGA-II). The time-varying cylinder micro-motions are considered. Aiming to minimize both the mechanical and volumetric losses, optimal dimple shapes are obtained for an industrial pump and an electro-hydrostatic actuator (EHA) pump. The millimetre-scale interfaces which are large-scale textured with hundreds of the optimal micron-scale dimples are evaluated. After comparing two dimple arrangements for the EHA pump, the athletic-track-shaped and water-drop-shaped dimples are found to reduce the friction torque and leakage by 8.2% and 9.9% on average, respectively.
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