Generalized Lagrange–Jacobi–Gauss–Radau collocation method for solving a nonlinear optimal control problem with the classical diffusion equation

Abstract

In this paper, a well-known nonlinear optimal control problem (OCP) arisen in a variety of biological, chemical, and physical applications is considered. The quadratic form of the nonlinear cost function is endowed with the state and control functions. In this problem, the dynamic constraint of the system is given by a classical diffusion equation. This article is concerned with a generalization of Lagrange functions. Besides, a generalized Lagrange–Jacobi–Gauss–Radau (GLJGR) collocation method is introduced and applied to solve the aforementioned OCP. Based on initial and boundary conditions, the time and space variables, t and x, are clustered with Jacobi–Gauss–Radau points. Then, to solve the OCP, Lagrange multipliers are used and the optimal control problem is reduced to a parameter optimization problem. Numerical results demonstrate its accuracy, efficiency, and versatility of the presented method.