trans_sys_chap17

trans_sys_chap17 - Introduction to Transportation Systems 1...

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Introduction to Transportation Systems 1
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PART II: FREIGHT TRANSPORTATION 2
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Chapter 17: The Kwon Model -- Power, Freight Car Fleet Size, and Service Priorities: A Simulation Application 3
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± Oh Kyoung Kwon developed some ideas that relate to the concept of “yield management”, applied to freight movements in the rail industry. Kwon, O. K., Managing Heterogeneous Traffic on Rail Freight Networks Incorporating the Logistics Needs of Market Segments , Ph.D. Thesis, Department of Civil and Environmental Engineering, MIT, August 1994. 4
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Power, Freight Car Fleet Size and Service Priorities A Simple Network 2 days A B 1 day 2 days Figure 17.1 5
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± A shipper is generating loads into the system at node A; this shipper is permitted to assign priorities to his traffic. ± So, the shipper can designate his traffic as high-, medium- or low- priority, with high, medium and low prices for transportation service. ± Assume that the volumes of traffic at each priority level are probabilistic. 6
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Power Selection ± Suppose that the railroad has to make a decision about the locomotive power it will assign to this service, which, in turn, defines the allowable train length. ± So the railroad makes a decision, once per time interval -- for example, a month -- on the power that will be assigned to this service. ± A probability density function describes the total traffic generated per day in all priority classes: high, medium and low. ± This would be obtained by convolving the probability density functions of the high-, the medium- and the low-priority traffic generated by that shipper, assuming independence of these volumes. 7
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Probability Density Function for Daily Traffic f(total daily traffic) Probability all traffic is carried on the 1st day Probability some traffic is delayed total daily Design traffic Train Length 8 Figure 17.2
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Car Fleet Sizing ± In addition to power, the question of car fleet sizing affects capacity. There is an inventory of empty
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trans_sys_chap17 - Introduction to Transportation Systems 1...

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