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W czasie wykonywania lotów przez statki powietrzne zasadnicze kwestie stanowią gotowość bojowa oraz mający na nią wpływ system zaopatrywania. Podstawowymi przedmiotami zaopatrzenia w czasie realizacji zadań są środki bojowe i paliwa lotnicze. Skuteczne zarządzanie przepływem wymaganych produktów a także niezawodność pojazdów i dyspozycyjność załogi wpływają na jakość wykonania zadania. Składowe tworzące...
Rail high-speed passenger lines (HSPL) have been developed rapidly in China; however, the traditional rail crew scheduling mode called responsible mode, in which crews are bundled with vehicles, is hard to adapt to the transit characteristic of HSPL. Moreover, the utilization of rail crew resources is commonly inefficient and the scheduling methods are generally behindhand. To reduce the pressure...
The rigidity of twist-drill are determined by its structure parameters. In this paper, the FEM model of the twist-drill is established by software ABAQUS. With the methods of Orthogonal test and FEM, a quantitative analysis to the torsional rigidity of twist-drill have been developed. The optimization of the twist-drill structure parameters are carried out with Genetic Algorithm based on the objective...
In this paper, an optimization is reported for the determination of time response (Tr) and power (P) of Electric Vehicle. The electric constant of back-electromotive-force, stator d- and q- axes inductances, switching period, battery voltage, stator resistance and torque gear ratio were selected as factors being able to influence the Tr and P. The optimization process was carried out with Doehlert...
Traffic congestion has been a long-held social problem because of the increasing number of vehicles. In this paper, we apply a pheromone model to a traffic signal control in order to alleviate the traffic congestion. The pheromone model is a tool to communicate among insects (e.g., ants) for their crowd action. In our target problem, the pheromone is strewed by vehicles in a trail across the road...
Electrical storage devices can be very useful in electrified mass transit and in particular in trolleybus lines and tramways. In fact, storage devices are capable of supporting the line voltages of old lines, avoiding the opening of minimum voltage protective relays, especially when the new generation vehicles of greater power circulate. Among electrical storage devices, supercapacitors seem to be...
The optimal operation of a rail vehicle with onboard energy storage device minimizing energy consumption in catenary free mode is discussed in this paper. The Electric Double Layer Capacitor (EDLC) is assumed as an energy storage device because of its high power density, long lifetime and quick charge/discharge. The proposed method can determine the optimal acceleration/deceleration at each sampling...
A new method integrating reduced model and mixed design variables is proposed and applied in the lightweight design of a bus skeleton for the purpose of mass reduction without loss in structural performance. A whole skeleton model and a reduced model are built. All parts except chassis and floor assembly are reduced out using static reduction method. Reduced model is verified with finite element analysis...
A parallel algorithm of simulated annealing to solve the vehicle routing problem with time windows (VRPTW) is considered. The VRPTW is an NP-hard bicriterion optimization problem in which both the number of vehicles and the total distance traveled by vehicles are minimized. The objective is to establish to what extent the computation time required to solve the VRPTW can be decreased by a number of...
Vehicle routing problem with time windows (VRPTW) is a well-known and complex combinatorial problem, which has received considerable attention in recent years. In this paper, we propose an improved genetic algorithm to solve the VRPTW problem. The proposed approach, called IGA, employs two novel genetic operators. To verify the performance of IGA, we test it on six famous benchmark problems. Simulation...
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