A Simple Dual-RAMP Algorithm for the Uncapacitated Multiple Allocation Hub Location Problem

Abstract

This paper presents a Dual-RAMP algorithm for the solution of the multiple allocation hub location problem (UMAHLP). This approach combines information of a lagrangean relaxation procedure with subgradient optimization on the dual side with primal-feasible solutions on primal side, that are obtained by a simple improvement method. The overall performance of the proposed algorithm was tested on standard Australian Post (AP) and Civil Aeronautics Boarding (CAB) instances, comprising 192 test instances. The effectiveness of our approach has been proven by comparing our results with other state-of-the-art algorithms.