Abstract:

Aiming at the convergence difficulties and low optimization efficiency of Collaborative Optimization (CO), an improved collaborative optimization algorithm (ICO) is proposed in this paper. By introducing the adaptive relaxation factor to let the restriction of consistency equality be transformed to the restriction of nonequality as well as by constructing the mixed penalty function to convert the systemlevel constraint optimization problem into unconstraint optimization problem, the improved algorithm can overcome the disadvantages of convergence difficulties of traditional collaborative optimization. Experimental results show that the stability, reliability and computing efficiency of ICO are better than CO, and lay a foundation for solving more complex engineering system.

Key words: multidisciplinary design optimization;collaborative optimization;offshore supply vessel