University of Tabriz Computational Methods for Differential Equations 2345-3982 9 2 2021 04 01 A new numerical Bernoulli polynomial method for solving fractional optimal control problems with vector components 446 466 10330 10.22034/cmde.2020.34992.1598 EN Vahid Taherpour Department of Mathematics, Khorram Abad Branch, Islamic Azad University, Khorram Abad, Iran Mojtaba Nazari Department of Mathematics, Khorram Abad Branch, Islamic Azad University, Khorram Abad, Iran Ali Nemati Young Researchers and Elite Club, Ardabil Branch, Islamic Azad University, Ardabil, Iran Journal Article 2019 08 06 In this paper, a numerical method is developed and analyzed for solving a class of fractional optimal control problems (FOCPs) with vector state and control functions using polynomial approximation. The fractional derivative is considered in the Caputo sense. To implement the proposed numerical procedure, the Ritz spectral method with Bernoulli polynomials basis is applied. By applying the Bernoulli polynomials and using the numerical estimation of the unknown functions, the FOCP is reduced to solve a system of algebraic equations. By rigorous proofs, the convergence of the numerical method is derived for the given FOCP. Moreover, a new fractional operational matrix compatible with the proposed spectral method is formed to ease the complexity in the numerical computations. At last, several test problems are provided to show the applicability and effectiveness of the proposed scheme numerically. https://cmde.tabrizu.ac.ir/article_10330_cab7ffd5a82352b18833673d5b555aaa.pdf