Research On Optimization And Invulnerability Of Large-cargo Transportation Networks

Large-cargo is the necessary supplies of large-cargo project,the safety transportation impact on the schedule of project,related to the national industrial development.Relative to ordinary goods transportation,large-cargo is generally very long,large and overweight goods,so the transit routes of large-cargo and the invulnerability of transport network are related to whether it can be safely and on time delivery.In this paper,combined with engineering practice,focusing on the optimization of large transport routes and the transport network of the two issues of resistance to carry out theoretical and case studies.In the choice of large-cargo transport routes,the need to take into account the particularity of large,choose to make large safety through the road is particularly important,the greater the safety of road sections,not only can reduce the risk of large transport,and can save Transportation costs and reduced transit times.Therefore,the optimization of large-cargo transport network path is different from the optimization of general cargo transportation path.The above theory is based on the assumptions of the stability of the large-cargo transport network of engineering conditions,when the transport network by external interference or unexpected events will lead to network instability,so the network's survivability will also affect the large transport of large.Through the research on the survivability of the large-cargo transportation network,the anti-attack strategy under different attack modes is put forward,so as to improve the survivability of the transportation network and ensure the safe and timely delivery of the project.Therefore,it is of great significance to study the path optimization of large-cargo transport network and the survivability of transport network.The main work of this paper is as follows:(1)The path optimization mode of large-cargo transport network is established,and a solution method is proposed.The optimization model which was considered the road reconstruction and time requirements of large-cargo transport network path is established for the safety and economy of large-cargo transportation by considering the restrictive factors of large-cargo transport in highway,railway and waterway,and the length of the path is determined by the weighting function Fuzzy sorting method.Then based on customer demand preferences of the weight information and square power operator to integrate multi-objective function,and finally through the expansion of the standard method to solve the objective function.This method not only overcomes the subjectivity of each edge length with definite numerical values,and takes into account the preference information of customer demand,the solution method is simple and the calculation is saved.(2)Analysis of the project large-cargotransport examples.Based on the example of large-cargo transportation,the paper analyzes the condition of the line during transportation,first of all,combines with the existing experience of transportation history,conducts multi-scheme comparison and selection,and then uses the established path optimization model and the solution method,and selects the appropriate transportation path,The result proves the validity of the model and the algorithm.The put forward the key problems of transport operations in the example and the development of transport equipment for the construction of large-cargo transport provides a theoretical basis.(3)The mechanism of survivable topology evolution of large-cargo transportation network is designed,and the static and invulnerability of engineering large-cargo transportation network is analyzed.The large-cargo transportation network is described to tphysical and service network structure and the evolution model of large-cargo transport network is construct is based on the complex traffic network.Based on the mean field theory and simulation,it is proved that the network degree distribution index conforms to the power-law distribution,and reveals the scale-free characteristic of the engineering large-cargo-scale transportation network.Considering the static and invulnerability of engineering large-cargo transport network,an effective method to improve the static resistance of the network is put forward,which effectively solves the problem of safe transportation of engineering.(4)Describes the failure process of engineering large-cargo transport network cascade,and constructs the dynamic invulnerability model of constructing large-cargo transportation network.The concept of invulnerability of large-cargo transport network is first proposed,and the failure process of constructing large-cargo transport network based on node comprehensive importance and node state is described.The relationship between node failure ratio and each adjustment parameter is analyzed by numerical simulation.In view of the problem that the anti-destructive performance of the large-cargo transport network is related to whether the large-cargo pieces can be safely and timely,the network attack strategy and the anti-destructive measure are put forward,the frame of the large-cargo transportation network is construct,the feasibility analysis of the large-cargo transport network is carried out.Then puts forward the effective measures to improve the dynamic and invulnerability of large-cargo transportation network.In summary,this paper aims to solve the problem of path optimization and invulnerability of large-cargo transportation network,and to study the related theories and methods used to optimize the transportation path and improve the network's anti-destructive performance.Through the example and simulation analysis,the model and the proposed method are validated,which provides theoretical and practical reference for large-cargoconstructing transportation.