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The vehicle routing problem with time windows (VRPTW) is based on a vehicle routing problem (VRP) which increased customer access time windows. More and more of the VRPTW research is attention because many real-life problems can be attributed to VRPTW, Consequently, good vehicle routing can not only increase the profit of logistics but also make logistics management more scientific. In view of the...
In this paper, we are interested in the Robust Wounded Transfer Problem (RWTP) in the background of large-scale emergencies such as typhoons, floods, earthquakes, droughts and so on. We introduce the theory of robust discrete optimization, and formulate the problem as a multi-point transportation model with multi-type vehicles, based on an absolute robustness criterion to minimize the maximum total...
This paper focuses on the analysis of bus crew and vehicle scheduling under the management system commonly-seen in China. With considerations of management rules in practice and related regulations in China, this study proposes a bi-level multi-objective programming model for optimizing the crew and vehicle scheduling for the operation of public bus system. The developed model first estimates the...
Vehicle or bus scheduling problem (VSP), involving in a given set of time-tabled trips to be assigned to vehicles to minimize capital and operating costs, is one of the most critical issues faced by transit agencies. This paper addresses a multi-depot multi-vehicle-type VSP with route time constraints as well as capacity of depot restrictions, and presents a model with multiple objectives to minimize...
This study focuses on customer relations management, and utilizes route optimization to achieve efficient delivery. It applies a service-directed architecture technology to allow clients, sellers, and logistics industries in the supply chain to communicate more closely. Through interactive online orders, consumers could conveniently monitor the status of their orders. In this era of energy deficiency,...
In order to improve the efficiency and stability of the trajectory planning of glide phase for hypersonic cruise vehicle, this paper proposes an efficient trajectory optimization approach based on the theory of hierarchical planning. Firstly, the equations of motion and optimization for the vehicle are presented. Secondly, the algorithm generates a safe corridor according to the constraints of trajectory...
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...
It is necessary, for a modern enterprise, to solve the urgent problem that how to effectively integrate enterprise existing resources and increase overall operational efficiency. In this paper, a tally Devanning/Container Loading business system based on the lightweight framework of J2EE(Spring + Hibernate + Struts) was implemented, according to the detailed analysis of business requirements and goals...
In this paper, collusion cooperation game theory is applied to optimize a linear passive vehicle suspension model with eight DOF, including six vertical and two rotation motions. Comprehensive considering road surface damage and ride comfort, taking stiffness and damping of seat and suspension system as design variables; and taking seat acceleration RMS, tire's relative dynamic load and suspension's...
In this paper, a Chattering-Free Sliding Mode (CFSM) optimum controller is proposed to control Auxiliary Power Unit (APU) of series hybrid electric vehicles. Asymptotic stability of the controller is proven using Lyapunov's second theorem. The stability is guaranteed under the model uncertainties. The controller eliminates the discontinuity in control signal so that it doesn't include chattering which...
Vehicle axle structural design and optimization is an important part of the vehicle development process. Its strength is directly related to vehicle safe under impact. The design should consider the integrity, achieve the same database of design and analysis of the structural data, The parameters model of ATV's axle is set up based on the seamless integration technique of all the module of Pro/E platform,...
Aimed at the problem of multi-objective optimization, solution on the oversaturated signalized intersection by using fuzzy logic control (FLC) is presented. The essential and characteristics of multi-objective optimization in urban traffic signal control are analysed. The performance measures of minimizing average delay, stop times and average queue length are established, according to the initial...
To support the global reach concept, the hypersonic vehicle is designed to realize the global strike mission. The paper applies the enhancing parametrization method to the reentry trajectory optimization of the hypersonic vehicle. This problem is considered as an optimal control problem with some path constraints, which must be satisfied along the reentry phase. The purpose is to design an optimal...
The collection vehicle routing problems with intermediate facilities (CVRP-IF) is actually belong to a well-known generalization of VRP, the Multi-Depot Vehicle Routing Problem with Inter-Depot Routes (MDVRPI), which is a combinatorial optimization problem and holds a central place in reverse logistics management, such as waste collection management. This paper presents an improved multiple ant colony...
The ability of Vertical and/or Short Take-Off and Landing is the objective of advanced fighter and shipboard fighter. In this paper we proposed a prototype of tailless configured STOVL aerial vehicle. Based on which, the mathematical model was studied by mechanical analysis and CFD (Computing Fluid Dynamics) computation. Besides, an intelligent adaptive based control law was proposed and the optimization...
Delay is a significant parameter that is used in the optimization of signal settings for intersections and the estimation of the level of service at signalized intersections, and it is also a parameter that is difficult to estimate. Based on the existing theory of delay at signalized intersection, this paper analyzes the delay at a signalized intersection of each phase for entrance with the arrival...
The optimal path problem has always been the research core of city emergency rescue. Its research goal has developed from looking for “the shortest path” to searching “the optimal path”. The related algorithms differ in different circumstances. In addition to distance problem, the influence of various practical factors should also be considered under the complicated actual conditions. An improved...
This paper presents a vision-based approach with unsupervised learning for robust, accurate and stable detection of the drivable road to deal with autonomous driving in changing environments. This approach is based on a formulation of stereo with homography as a Maximum A Posteriori (MAP) problem in a Markov Random Field (MRF). Under this formulation, we develop an alternating optimization algorithm...
This paper presents a new Advanced Driver Assistant System (ADAS) with an ecological aspect (EDAS). A low fuel consumption problem is formulated coupled to a safety problem (longitudinal spacing). Several discussions are conducted concerning the computational time reduction, the choice of an optimization method by comparisons. A fuzzy controller is developed to introduce some safety margins that are...
Relative coordination has predominant advantage in uncertain environment path planning problem because it denies much of redundant information of the dynamic environment while avoids the rotation transformation which is a big burden in the traditional methods. Based on relative coordination, this paper proposes a trimmed Ant Colony Optimization (ACO) algorithm for three dimensional trajectory generation,...
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