This paper examines the development, operation, and challenges of automated baggage handling systems in modern airports. It begins by explaining why increasing passenger volumes and security demands made conventional baggage handling obsolete. The paper then describes the core technology — including destination coded vehicles (DCVs), barcode scanning, and computerized routing — before analyzing the high-profile failure of Denver International Airport's fully automated system in the 1990s, which suffered from poor project management, software flaws, mechanical breakdowns, and massive cost overruns. It then discusses persistent engineering challenges such as queue cascades and DCV synchronization, concluding with an account of the more successful contemporary system at London Heathrow's Terminal 5, which integrates security screening, load optimization, and anti-terrorism protocols.
The paper effectively uses a comparative case study method. By setting Denver's failure against Heathrow's relative success, it derives generalizable lessons about systems design and project management rather than treating each airport as an isolated anecdote. This move from particular failure to broader principle is the hallmark of applied engineering analysis.
The paper opens with a three-paragraph introduction that frames the problem and previews the argument. Two sections establish context and technical background before the longest section — Denver's failed system — provides the central case study. A dedicated section on persistent challenges shifts to theoretical analysis, and the Heathrow section provides a positive counterpoint. A brief conclusion synthesizes the lessons. This seven-section structure is well-proportioned for a research paper of this scope.
One of the most notable innovations in modern air travel has been the development of automated baggage handling systems. Most major cities now have new or redesigned airports that handle ever-increasing flows of passengers and baggage. Automated baggage handling systems make it possible to process and track these flows more reliably and efficiently by identifying each and every bag passing through the airport and tracking its position at all times — from the moment it leaves the passenger's hand at check-in to the time it is reunited with the passenger at the baggage claim carousel. These qualities depend upon computers handling enormous amounts of data and making split-second decisions about how to move each piece of baggage in light of all of that data.
Automated baggage handling systems are not, however, without significant problems. Because their operation involves processing vast amounts of data and managing an enormous number of moving parts — including vehicles devoted to handling bags individually — such systems are Byzantine in their complexity. Human experience teaches that all such complex systems are prone to breakdowns. This is certainly true for automated baggage handling systems. In fact, the story of one of the most ambitious projects in building an automated baggage handling system is, to a great extent, a story of repeated failure and failed hopes.
The history of failure and frustration that has often followed the implementation of automated baggage handling systems has led to improvements in their design, construction, and operation. Systems currently being developed for newly constructed airports have eliminated many of the problems that plagued their predecessors. In addition, these newer systems are well adapted to meeting one of the most immediate and pressing threats to safe and efficient air travel: terrorism. Because they can track and identify every bag passing through the airport, automated baggage handling systems can greatly reduce the risk that terrorists will be able to smuggle explosives into the cargo compartments of commercial flights. If nothing else, the ability of automated baggage handling systems to assure airport security demonstrates that, for all of their problems, they are an absolutely essential aspect of contemporary aviation.
The increasing volume of modern air travel made it virtually impossible to continue handling baggage in the conventional fashion. In conventional baggage handling systems, decisions about the destination and routing of bags are made predominantly by individuals, who must read baggage tags and place bags by hand onto baggage-carrying vehicles, or "tugs," which ferry the bags to waiting planes. This process is reversed when it comes time to unload planes and distribute bags back to the terminal. Conventional systems are labor-intensive and therefore very expensive and often unreliable. Moreover, they cannot be used effectively over great distances. When bags must be moved from one end of a large terminal or concourse to another, time is of the essence. Conventional baggage handling systems simply cannot move quickly enough to accommodate airports built on a gargantuan scale.
Gargantuan scale is the order of the day in contemporary airports. Cities compete with each other to serve as "hubs" for one airline or another. Hub airports must be large, contain many gates, and provide quick turnaround times for both planes and passengers so that airlines can provide an extensive and ever-shifting system of interconnecting flights. The scope of services that contemporary airports must deliver can seem overwhelming. In 2005, it was projected that, by 2011, London's Heathrow Airport would service 30 million passengers when its Terminal Five was completed, and that the airport would employ 84,000 workers (Coupe, p. 24).
The fact that airlines can be spectacular targets for terrorism also changes the way airports operate. As one author pointed out, "[t]he challenge of dealing with such huge numbers is compounded by the ever-present threat of terrorism and the attendant emphasis on tight security" (Coupe, p. 24). Airport operators are keenly aware that prospective terrorists may seek to place explosives in baggage and have it loaded onto planes. There is therefore a need to identify and analyze each and every bag that passes through check-in and on to a plane. These changes in airport operation have made clear that it is impossible to safely operate a large airport without a system that can track every bag and move it across terminals and concourses at a rapid pace — precisely what automated baggage handling systems provide.
When a passenger arrives at check-in, a bar-coded tag is attached to the bag. The tag identifies the name of the bag's owner, his or her flight number, airline, and final destination. If the passenger is making any intermediate connections, those are identified on the tag as well. Once tagged, the bag is placed on a conveyor belt that brings it toward a mini-railway system, where it will be routed toward the passenger's waiting plane (Schloh, 1996).
The mini-railway system is populated by "destination coded vehicles" (DCVs). There is one DCV for every bag. Each DCV is a radio-controlled cart with a plastic tub on top. The radio transponder permits the system's computers to control the movement of the DCV. The tub can move into three positions to automatically load, unload, and carry a bag. The DCVs are controlled by a computer system that senses the flow of passengers throughout the terminal and dispatches DCVs to the appropriate places. During peak times at Denver International Airport, approximately 3,550 DCVs are available. The DCVs are propelled by linear induction motors placed at regular intervals along the track (Schloh, 1996).
The conveyor belt holding the bag begins to move when a DCV arrives at the end of the belt, ready to accept the bag. The bag is then propelled into the tub at the top of the DCV. The DCV receives the bag without coming to a complete stop — it only slows down briefly as it passes along the rail line. As the bag is placed into the DCV, a laser scanner reads the bar code on the tag and transmits information to the computer system, which associates the bag with the DCV on which it has been loaded. The DCV then increases its speed and moves into the rail system (Schloh, 1996).
Once the information about the bag and its associated DCV are recognized by the computer, the computer works to assure that the DCV is routed to the loading area for the correct plane. Computers control the movement of the DCVs so that they merge with other DCV traffic passing through the system. When the DCV reaches the area near the plane, it exits the system and brings the bag to the loading area for that plane (de Neufville, 1994).
Early efforts at automated baggage handling systems were undertaken at the United terminal at San Francisco International Airport, the Rhein-Main International Airport in Frankfurt, and at Franz Joseph Strauss Airport in Munich. These early systems had some significant differences from the later design used at Denver and elsewhere. The Frankfurt system used only trays running on conveyor belts; it did not use any DCVs or any kind of mini-railway network. The San Francisco system used much of the same technology but operated on a far smaller scale, using only one-twelfth the number of DCVs (Schloh, 1996).
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Meyerson, A. (1994, April 18). Automation off course in Denver. New York Times, pp. D1–D2.
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Software failure causes havoc at Heathrow. (2008, February 20). UPI NewsTrack. Retrieved May 28, 2010, from http://www.upi.com/Top_News/2008/02/20/Software-failure-causes-havoc-at-Heathrow/UPI-86521203528240/
Tarau, A. N. (2009). Route choice control of automated baggage handling systems. Transportation Research Record, 2106, 76–82.
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