A computerised decision support system for the implementation of strategic logistics management optimisation principles in the planning and operation of integrated urban public transport

[摘要] ENGLISH ABSTRACT:Public and private transport system planning and operation have tended to be fragmentedfunctions. In particular, public transport is often planned and operated independently of theprivate transport system. South African government policy now requires that comprehensive,strategic transport plans be prepared by metropolitan transport authorities. These plans areexpected to conform to national strategic objectives as well as including local current and longtermobjectives. This planning is required in the environment of a multi-modal, multi-operator,public-private partnership scenario that is new for most of the role players. The lack ofexperience is accompanied by a lack of any existing model for dealing with this scenario. Thisdissertation describes such a model. The model is based on the principles of strategic logisticsmanagement commonly employed in commerce and industry, including service-orientedindustries. The modelling process is thus based on achieving a combination of customer serviceand long-term objectives.The model comprises a number of separate components and steps:• A transport network model (Emme/2).~ A multi-class, generalised-cost assignment of private and public transport demand onto anetwork, modified to be modeless to the public transport users, is performed. Thisassignment allows for the imposition of generalised-cost reflecting urban-planningobjectives in addition to more conventional costs such as travel cost. In this assignment,the interaction of public and private transport is accounted for and results in an associatedmodal choice.~ A series of single-class generalised-cost assignments is then used to focus publictransport demand to create corridors of demand adequate to justify public transportroutes. This process can be enhanced to develop a design promoting switching fromprivate to public transport. It also allows for multi-period route design.~ The results of this modelling process are output to a text file and then subject to theprocesses described below. The results of these processes are then input into the networkmodel where a standard transit assignment is performed and used to modify the proposedlines and update the network design data with respect to boardings and alightings atnodes. This information is used to design fixed infrastructure.• A Microsoft Access database and route extraction program.);> The network model data is drawn into the database where it is subject to a routeextraction program that converts the assignment results from the network model into a setof mode specific potential public transport route definitions. These route definitions arebased on paths of maximum demand. The extraction process is controlled by parametersspecified by the planner, such as minimum route lengths and the demand level for variouscategories of service.);> After route extraction, vehicle allocation, and transit assignment, the database providesdetails of the boardings and alightings and number and details of transit lines using eachnode and link in the network. This data is used to design fixed infrastructure.• A Microsoft Excel spreadsheet vehicle operating cost model.);> For each vehicle type, the operating cost given the anticipated vehicle mileage andoperating speed is determined. This is used to guide the choice of vehicles for differentroutes.• A Lingo goal-programming model.);> The potential routes and the available or potential fleet are subjected to a goalprogrammein which the optimum choice of vehicle allocation is determined. Theallocation parameters can be controlled by the planner. These parameters may includecosts, energy, fuel consumption, and vehicle and route limitations amongst others. Multiperioddesign is included in the modelling process so that the optimum design may be forthe operating period, daily, or weekly cycle.The modelling process provides two main outputs:• A set of fully described and costed transit lines ill terms of both routing and vehicleallocation. These transit line definitions can be output to the level of driver instructions ifnecessary.• Details of the type and location of infrastructure to be provided on the network.

[发布机构] Stellenbosch University