The transit fleet maintenance community is positioned to make some significant advances in the new millennium. Changes in technology offer much potential for supporting both traditional management activities and some equipment capabilities that have recently become available. However, benefits will be realized only after successfully navigating some significant challenges. Ironically, the tende...

This paper presents a hybrid evolutionary algorithm (HEA) to solve heterogeneous fleet vehicle routing problems with time windows. There are two main types of such problems, namely the fleet size and mix vehicle routing problem with time windows (F) and the heterogeneous fixed fleet vehicle routing problem with time windows (H), where the latter, in contrast to the former, assumes a limited ava...

According to the demand for condition-based maintenance online decision making among a mission oriented fleet, an intelligent maintenance decision making method based on Multi-agent and heuristic rules is proposed. The process of condition-based maintenance within an aircraft fleet (each containing one or more Line Replaceable Modules) based on multiple maintenance thresholds is analyzed. Then ...

The fleet assignment model (FAM) for an airline assigns fleet types to the set of flight legs that satisfies a variety of constraints and minimizes the cost of the assignment. A through connection at a station is a connection between an arrival flight and a departure flight at the station, both of which have the same fleet type assigned to them that ensures that the same plane flies both legs. ...

Title of Document: INTEGRATED MANGEMENT OF EMEREGENCY VEHICLE FLEET Saini Yang, Doctor of Philosophy, 2006 Directed By: Professor Ali Haghani Department of Civil and Environmental Engineering The growing public concerns for safety and the advances in traffic management systems, that have made the availability of real-time traffic information a reality, have created an opportunity to build integ...

Abstract Road vehicles play an important role in the UK’s energy systems and are a critical component reducing reliance on fossil fuels mitigating emissions. A dynamic model of light-duty vehicle fleet, based predator-prey concepts, is presented. This designed to be comprehensive but captures features competition between types car market. It allows predict evolution hydrogen vehicle’s fleet. Th...

In this paper, we propose a new routing problem to model a highly relevant planning task in small package shipping. We consider the Prize-Collecting Vehicle Routing Problem with Non-Linear cost (PCVRPNL) in its single and multi-depot version, which integrates the option of outsourcing customers to subcontractors instead of serving them with the private fleet. Thereby, a lower bound on the total...

287 Numerous organizations are involved in distributing goods and materials. When shipping alternatives exist, the selection of the appropriate shipping alternative (mode) for each shipment may result in significant cost savings. This paper describes a highly flexible dispatching system that selects the shipping mode to be used for each shipment while minimizing the overall shipping costs. Mult...

The Unified Tool for Mapping Opportunities for Safety Technology (UTMOST) is a model of crash data that incorporates the complex relationships among different vehicle and driver variables. It is designed to visualize the effect of multiple safety countermeasures on elements of the driver, vehicle, or crash population. We have recently updated UTMOST to model the effects of the time-course of fl...