Multi-objective Optimization Design on Squamous Texture for the Sealing Performance

The textured sealing surface increases opening force, but it is often accompanied by a high leakage rate. This study proposes a novel squamous texture and develops a fluid lubrication model to calculate its sealing performance, then optimizes the design parameters of the squamous texture by combining the response surface methodology and NSGA-II multi-objective optimization algorithm. The results indicate that the squamous texture has excellent hydrodynamic effect. The load-carrying capacity and leakage rate of the oil film both increase with the rise of the rotation speed. The depth of the squamous texture has a significant impact on the load-carrying capacity. Meanwhile, the depth, width, area proportion, and ratio of major and minor axes of the squamous texture sequentially affect the leakage rate. The multivariate equations for texture design parameters and sealing performance were obtained using the surface response methodology. At last the Pareto frontier solutions for high load-carrying capacity and low leakage rate were obtained through the NSGA-II multi-objective optimization.