An Airlift Hub-and-Spoke Location-Routing Model with Time Windows: Case Study of the CONUS-to-Korea Airlift Problem
AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
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Traditionally, the United States Air Forces Air Mobility Command AMC has used the concept of direct delivery to airlift cargo and passengers from a point of embarkation to a point of debarkation. This study develops an alternative hub-and-spoke combined location-routing integer linear programming prototype model, and uses this model to determine what advantages a hub-and-spoke system offers, and in which scenarios it is better-suited than the direct delivery method. Additionally, the analysis suggests that the C-17 may be better-suited, in certain airlift situations, for theater airlift versus strategic direct delivery airlift. The model features the following elements time windows, cargo tracking capability, multiple frequency servicing, aircraft basing assignments and routing, and the selection of the optimal number of local-delivery aircraft to be used. The model is an extension on the following works the hierarchical model of Perl and Daskin 1983, time windows features of Chan 1991, combining subtour-breaking and range constraints of Kulkarni and Bhave 1985, and multiple servicing frequency via the clustering co-location method for binary variables of Baker 1991. Additionally, an original approach for cargo tracking is developed and incorporated. A notional CONUS-to-Korea transoceanic airlift problem is used to demonstrate the numerous features and power of the model.
- Logistics, Military Facilities and Supplies