Showing papers on "Fleet management published in 1971"
TL;DR: In this article, the authors formulated models of fleet routing and scheduling problems for transportation systems as integer linear programs with 0-1 variables and proposed a solution technique of the Land-and-Doig type.
Abstract: Models of fleet routing and scheduling problems for transportation systems are formulated as integer linear programs with 0-1 variables. Detailed formulations and a solution technique of the Land-and-Doig type are presented and demonstrated on examples. The conclusion is that large scale models can be solved using this technique.
126 citations
TL;DR: In this paper, a ship fleet management problem is described which concerns the phasing out of a fleet of general cargo ships over a 10-year period with the possibility of premature sale and temporary replacement by charter ships.
Abstract: A ship fleet management problem is described which concerns the phasing out of a fleet of general cargo ships over a 10-year period with the possibility of premature sale and temporary replacement by charter ships. The objective is to determine a sale and replacement policy which maximizes long term company assets. The problem is tackled by selecting a priority order for sale and determining the optimal rate of replacement by dynamic programming. The method has been programmed and demonstrated good returns and is in current use by a shipping company for a variety of management functions.
24 citations
TL;DR: In this paper, an algorithm is proposed to guide the selection of a fleet of equi-cost vehicles for a public transport route based on the Pareto optimum principle, which reduces the range from which the choice can be made.
Abstract: For the same total cost, a public transport route can be served by few large vehicles or more smaller ones. The problem is posed: which out of all equi-cost fleets to select? An algorithm is proposed to guide such selection. To avoid potentially controversial value judgments, the algorithm is based on systematic reduction of the range from which the choice can be made. Considerable reduction in the range of choice can be achieved making use of the “Pareto optimum” principle alone. Analysis is based on a mathematical model describing the relation between the route fleet and characteristics of service to the passenger.
23 citations
01 Mar 1971
TL;DR: The growing interest in the use of operational research methods in fleet management probably stems from the realization that the cost of distribution of goods and services constitutes in some cases a significant proportion of the sales value of items.
Abstract: The growing interest in recent years in the use of operational research methods in fleet management probably stems from the realization that the cost of distribution of goods and services constitutes in some cases a significant proportion of the sales value of items. It is not surprising, therefore, to find many studies concerned with the problems of fleet management: What size should the fleet be? What replacement policy for the purchase of new vehicles should be adopted? What maintenance policy is best? How should the fleet be used to deliver goods in response to customer demand?
8 citations