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Articles

by Yinghua Liu
39 Views, 0 PDF Downloads

Aiming at the optimization problem of dangerous goods distribution routes in multi-distribution centers with time windows under uncertain environment. Proposes a robust optimization method with robust control parameters comprehensively considers the transportation risks of dangerous goods. Transportation expenses and service time windows, Constructs a multi-objective double-layer robust optimization model of dangerous goods distribution routes, Upper layer model tracing for minimizing transportation risks and transportation costs, the lower model adopts the user equilibrium traffic allocation model; According to Bert Simas-Sim and Robust Optimization Theory. Robust Equivalence Transformation of Upper Model with Uncertain Parameters; Joint Enhancement, Pareto, Genetic Algorithm and Frank-Wolfe Algorithms, a multi-objective solution is constructed. The hybrid algorithm of standard double-layer robust optimization model, adopts 3 segment coding and decoding method allele matching crossover operation and inversion mutation genetic operation method to solve the upper layer model, adopts frank-Wolfe algorithm to solve the lower layer user equilibrium model; take classic sioux-falls and traffic network as an example XZ80 16 Case Analysis of Dangerous Goods Distribution Route Optimization Problem with 3 Distribution Centers 7 Demand Points, to Verify Rationality of Model and Its Algorithm. Research results show that the hybrid algorithm: when the robust control parameters are 0 30 and 60 and, can quickly obtain 32 and 3 groups of robust optimal solutions respectively, and all solutions are distribution schemes including specific transportation sections and departure times, instead of delivery order; compared with traditional two-stage heuristic algorithm saves 54 in operation time 74%. The hybrid algorithm is better than two-stage heuristic algorithm, in solving efficiency, and expression form of solution. It can better complete multi-objective and double-layer robust optimization task of dangerous goods distribution path in uncertain environment 

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Articles

by Xing Qiao
32 Views, 0 PDF Downloads

The existing research results on the impact of urban road traffic accidents mainly focus on the impact scope and duration of traffic accidents, and the research method is based on the traffic flow theory of fluid mechanics. The theory assumes that the traffic flow is in a confined space and there are many entrances and exits and nodes in the urban road network, which is inconsistent with the actual situation. The impact of urban road traffic accidents on traffic is consistent with ripple phenomenon, so the water wave principle is used to quantitatively analyze the impact degree of urban road traffic accidents on traffic. First of all, the impact of urban traffic accidents on traffic and the ripple phenomenon of water surface interference are compared and analyzed. On this basis, the concept of traffic impact coefficient is put forward, and the characteristic curve of traffic impact coefficient is drawn by using the speed data obtained from investigation. Using SPSS software and water wave equation, the relationship model of traffic impact coefficient with time is established. The results show that the fitting degree of the model is good and has statistical significance.

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Articles

by Jianbai Li
61 Views, 0 PDF Downloads

During the 20 years of TOD's birth and development, its significance, goals and models have undergone significant changes. The analysis of TOD's evolution, classification and design principles in the United States is of reference value to the theoretical framework and development of TOD's localization in China. Through the comparison and case study of American TOD models in different periods and types, it is concluded that different types of TOD have the characteristics of centripetal and decentralized differences of community centers sustainable development orientation, equal emphasis on location efficiency and location shaping, etc. Finally, the paper summarizes the development trends of green TOD transportation corridor, the combination of bottom-up development and policy guidance, the focus of TOD development in suburbs, and the dense road network in small streets, etc. for reference in China's TOD planning and development.

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Articles

by Wei Wang
32 Views, 0 PDF Downloads

In order to host the Winter Olympics in Sochi in 2014, Russia has made a lot of investments, to improve the infrastructure of Sochi's transportation network, to build a new Sochi expressway, that is, the famous alternative to cu lot Avenue, it is parallel to the coastline of the Black Sea, from underground through downtown Sochi to reach Olympic venues and Adel Airport. The Shinkansen Project, with a total length of 16km includes the construction of 8 pair (16 sections) single hole tunnel, and open cut section, embankment and bridge.

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Articles

by Hongda Liu
33 Views, 0 PDF Downloads

Using Phosphorus Slag as Auxiliary Cementitious Material, Partially Replace Fly Ash to Prepare Machine-Made Sand Self-Compacting Concrete, and Optimize Its Mix Proportion. Research on Engineering Application of Self-compacting Concrete Road Retaining Structure with Phosphorus Slag, the results show that phosphorus slag powder can replace fly ash properly to improve the working performance of self-compacting concrete with the increase of phosphorus slag content concrete 7d strength decreases gradually, its 28d strength increases first and then decreases, when the content mass fraction is 25% to reach the best. The best coarse and fine aggregate ratio of phosphorus slag self-compacting rock fill concrete is 8:2, and the best volume ratio of machine-made sand is 46%. Concrete retaining structure constructed with C30 phosphorus slag self-compacting rock fill concrete, its appearance quality, its strength and technical and economic benefits are better than ordinary concrete. Phosphorus slag self-compacting rock fill concrete not only realizes the recycling of waste phosphorus slag, but also improves the stability of road retaining structures.

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