Objective This paper aims to study the influence of the approximation model, consistency constraints, and boundary update strategy of the BLISS-2000 multidisciplinary design optimization method on its convergence performance and optimization efficiency based on OpenMDAO.

Method First, the optimization process and boundary update strategy of BLISS-2000 are given. A BLISS-2000 model is then established based on OpenMDAO, and its accuracy is verified by mathematical and engineering examples. Finally, the effects of the approximation model's accuracy, consistency equality constraints, constraint relaxation, and boundary update strategy on the convergence performance and optimization efficiency of the model are studied.

Results The results show that improving the accuracy of the approximation model and selecting the appropriate constraint relaxation factors and boundary update factors can greatly improve the convergence performance and optimization efficiency of the BLISS-2000 model. At the same time, the recommended values of the relevant parameters based on constraint relaxation are obtained.

Conclusion The results of this study can provide useful references for the improvement of the BLISS-2000 method and its application in the conceptual design stage of ships and marine equipment.