Abstract: The minimum-deviation method is introduced into the mechanical multi-objective optimal design. Taking a multi-objective optimal design of hydrodynamic sliding bearing as the example and taking the minimization of friction coefficient and heat productivity，and the maximization of load capability as objectives, the minimum-deviation method is adopted to establish the multi-objective optimal mathematical model. The improved genetic algorithm is utilized to solve this multi-objective optimal problem. The solution-seeking process and its results show that the minimum-deviation method can obtain better results than conventional methods in dealing with multi-objective optimal problem and the validity and feasibility of the method is verified.

Key words: minimum-deviation method, mechanical multi-objective, optimal design, improved genetic algorithm