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Full-Text Articles in Engineering
Vulnerability Assessment And Re-Routing Of Freight Trains Under Disruptions: A Coal Supply Chain Network Application, Ridvan Gedik, Hugh Medal, Chase Rainwater, Edward A. Pohl, Scott J. Mason
Vulnerability Assessment And Re-Routing Of Freight Trains Under Disruptions: A Coal Supply Chain Network Application, Ridvan Gedik, Hugh Medal, Chase Rainwater, Edward A. Pohl, Scott J. Mason
Mechanical and Industrial Engineering Faculty Publications
In this paper, we present a two-stage mixed integer programming (MIP) interdiction model in which an interdictor chooses a limited amount of elements to attack first on a given network, and then an operator dispatches trains through the residual network. Our MIP model explicitly incorporates discrete unit flows of trains on the rail network with time-variant capacities. A real coal rail transportation network is used in order to generate scenarios to provide tactical and operational level vulnerability assessment analysis including rerouting decisions, travel and delay costs analysis, and the frequency of interdictions of facilities for the dynamic rail system.
Aircraft Route Optimization For Formation Flight, Jia Xu, Andrew Ning, Geoffrey Bower, Ilan Kroo
Aircraft Route Optimization For Formation Flight, Jia Xu, Andrew Ning, Geoffrey Bower, Ilan Kroo
Faculty Publications
We quantify the fuel and cost benefits of applying extended formation flight to com- mercial airline operations. Central to this study is the development of a bi-level, mixed integer-real formation flight optimization framework. The framework has two main components: 1) a continuous domain aircraft mission performance optimization and 2) an integer optimization component that selects the best combination of optimized missions to form a formation flight schedule. The mission performance reflects the effects of rolled-up wakes, formation heterogeneity, and formation-induced compressibility. The results show that an airline can use formation flight to reduce fuel burn by 5.8% or direct operating …