transportation general concepts lecture 15 esd.260 fall 2003 caplice
TRANSCRIPT
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Transportation General Concepts
Lecture 15ESD.260 Fall 2003
Caplice
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Transportation Operations
Consolidated operations (CO)Bus/rail transitLTLRailAirlinesOcean carriers/liner service
Package delivery
Direct operations (DO)TaxiTLUnit trainsCharter/private planesTramp servicesCourier
DO conveyances on CO carriers (sub-consolidation)Rail carsOcean containers Air “igloos”
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Core Transportation Activities
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Types of Transportation Systems
Based on Consolidation Used w/o TranshipmentPoint
One to OneOne to ManyMany to One Many to Many
With TranshipmentPointOne to ManyMany to OneMany to Many
Other IssuesDynamic TranshipmentPointsInterleavenedtripsPlanning versus Execution
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Solutions ApproachMath Programming Approach
Develop detailed objective function and constraintsRequires substantial data Solve MILP to optimality
Simulation ApproachDevelop detailed rules and relationshipsSimulate the expected demand patternsObserve results and rank different scenarios
Continuous Approximation Approach Develop a Logistics Cost Function (LCF) that incorporates the relevant decision variablesObtain reasonable results with as little information as possiblein order to gain insightsDetailed data can actually make the optimization process harder
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Time Space Diagram
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Cumulative Count Curve
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Logistics Cost Function
NomenclatureD = Annual demand (items/time)Cr = Rent cost ($/item-time)Ci = Inventory cost ($/item-time)Cf = Fixed transport cost ($/shipment)Cv = Variable transport cost (#/item)HMAX = Maximum headway (time)V = Shipment size (items)V = Total number of units shipped=ΣvvMAX = Maximum capacity for transport
mode (items)
Cs = Fixed cost per stop ($/stop)
Cd = Cost per distance ($/distance)
Cvd = Marginal cost per item per distance
Cvs = Marginal cost per item per stop
Ns = Number of deliverystops
Cvh = Variable handling costs ($/item)
Cfh = Fixed handling costs ($/pallet)
vhMAX = Maximum capacity for pallet or box (items)
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Holding Costs = R + I
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Move Costs = T + H
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Transport Costs
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Transport CostsRelation to Capacity
ft(V) is sub-additive: ft(V1+V2)≤ ft(V1)+ft(V2) CvVMAX<<Cf
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Transport CostsMultiple Modes
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Handling Costs
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Total Logistics Cost Function