Multi-Objective Optimization of Liquid Metal Bearing Based on Nsga-Ⅱ

Abstract

Liquid metal bearings excel in challenging environments due to their outstanding static/dynamic properties and high-temperature resistance. Using NSGA-II, this study optimized spiral groove liquid metal radial bearings (JLMB). Design variables (clearance, spiral angle, groove depth, ridge ratio, groove number, spacing) aimed to maximize load capacity and stiffness. Latin hypercube sampling and Kriging surrogate models correlated variables with objectives. TOPSIS determined optimal parameters. Resulting optimal JLMB parameters: clearance=10μm, spiral angle=26°, groove depth=5.2μm, ridge ratio=0.7, spacing=11.1mm, groove number=10. Optimized JLMB exhibited significantly enhanced static/dynamic performance, with load capacity of 2781.2N (1313% increase) and stiffness of 1.86×108 N/m (over 20-fold increase) compared to original parameters.

Keywords: NSGA-II, Journal liquid metal bearing, Spiral grooves