Research Article

New multiobjective optimization algorithm using NBI-SASP approaches for mechanical structural problems

¹ LIMSAD, Department of Mathematics and computing, Hassan 2 University, Ain Chock Sciences Faculty, Km8 Route El Jadida, BOP 5366 Maarif, Casablanca, Morocco
² LM, Department of Physics, Hassan 2 University, Ain Chock Sciences Faculty, Km8 Route El Jadida, BOP 5366 Maarif, Casablanca, Morocco

^* e-mail: selmoumen@yahoo.fr

Received: 26 January 2021
Accepted: 7 November 2021

Abstract

Various engineering design problems are formulated as constrained multi-objective optimization problems. One of the relevant and popular methods that deals with these problems is the weighted method. However, the major inconvenience with its application is that it does not yield a well distributed set. In this study, the use of the Normal Boundary Intersection approach (NBI) is proposed, which is effective in obtaining an evenly distributed set of points in the Pareto set. Given an evenly distributed set of weights, it can be strictly shown that this approach is absolutely independent of the relative scales of the functions. Moreover, in order to ensure the convergence to the Global Pareto frontier, NBI approach has to be aligned with a global optimization method. Thus, the following paper suggests NBI-Simulated Annealing Simultaneous Perturbation method (NBI-SASP) as a new method for multiobjective optimization problems. The study shall test also the applicability of the NBI-SASP approach using different engineering multi-objective optimization problems and the findings shall be compared to a method of reference (NSGA). Results clearly demonstrate that the suggested method is more efficient when it comes to search ability and it provides a well distributed global Pareto Front.