Route Optimization Of Refrigerated Containers Multimodal Transport For Perishable Agricultural Products

In recent years,with the rapid economic development and the improvement of people’s living standards,the demand for agricultural products in the Chinese market has increased year by year.At the same time,people are increasingly demanding the quality of agricultural products,which makes the long-distance cold chain logistics of perishable agricultural products face greater challenges.Refrigerated container multimodal transport is mostly long-distance interprovincial transport,which effectively guarantees the quality of agricultural products.In order to make more effective use of multimodal transportation resources,refrigerated containers and other transportation vehicles play an important role in the long-distance transportation of perishable agricultural products,which reduces the cost of agricultural multimodal transportation and improves efficiency.Therefore,it is of practical significance to study the optimization problem of multimodal transport routes for refrigerated containers of perishable agricultural products.Firstly,it analyzes the research on the optimization of multimodal routes for perishable agricultural products at home’ and abroad,and briefly describes the relevant theories of multimodal transportation of perishable agricultural products in refrigerated containers.It points out that the production area of perishable agricultural products is relatively wide and the life cycle is relatively short.It requires the intermodal transportation of refrigerated containers for intermodal transportation to ensure the quality of agricultural products.And introduces the solution method of multimodal transport path problem,divided into precise algorithm and intelligent algorithm.Secondly,based on the analysis of the cost and time of refrigerated container multimodal transportation,a minimum cost path optimization model is established.In the analysis of the cost of quality damage,the characteristics of the agricultural products themselves,the optimal transportation temperature and the quality degradation point were considered.In the analysis of transit time,the aggregation process of highway trucks is considered,assuming that highway trucks arrive according to Poisson distribution,the arrival of trucks and container handling systems are considered as a queuing theory to calculate the transit time of highway containers.In addition,the factors of the cost difference of the multimodal transport carrier’s own vehicle and the outsourced vehicle and the different freight rates of different transportation mileages are considered.Finally,after establishing a multimodal transport model,an ant colony algorithm was used to solve the example of a 23-node agricultural product transportation network,which verified the effectiveness of the model.And proposes relevant countermeasures and suggestions from four aspects:the cost of multi-modal transportation of perishable agricultural products,different delivery deadlines,carrier-owned vehicles and outsourced vehicles,and the impact of different transportation mileage on route selection.