Synthesis Optimization Of River-Sea-Going Ship Forms And Fleet Configuration Under Low-Carbon Background

With the deep development of the Yangtze River's construction and the continuous expansion of the foreign trade in China,river-sea-going transportation and river-sea-going vessels will obtain considerable development in the future.However,the technical level of the existing ships lags behind,and the ship types do not match the transportation environment.Besides,the fleets' overcapacity phenomenon becomes worse as the slowdown of world economic,which leads to the deficits of many shipping enterprises.Meanwhile,energy saving and emission reduction has been the trend of the shipping industry.Regulations about the emission have a profound impact on the configuration and operation of the fleets,which has been a significant issue in the optimization of river-sea-through vessels and fleets.In allusion to the above problems,a comprehensive evaluation system as well as the penalty cost function are set up to optimize the ship types and their design speeds with consideration of river-sea-going transportation's characteristics.Based on the Emission Control Areas(ECAs)and the Marine Emission Trading Scheme(METS),a multi-objective optimization model is established to optimize the yearly configuration and the service speed of the river-sea-going fleet under low-carbon environment.The research in this paper can offer integrated solutions for the long-term development of river-sea-going ships and fleets.This paper firstly analyzes the development environment of river-sea-going ships and fleets,which includes the navigation environment,low-carbon background and market circumstances.The optimum carbon-reduction mechanism is chosen under uncertainty.In addition,the influence of ECAs on single ship's cost and emission is discussed.At the same time,the cargo demand of a specific river-sea-going route is predicted with the method of GM-Markov,which lays the foundation for the fleet optimization.The ranges of ships' main parameters are determined according to the navigation constraints and information of the existing ship types.Then the critical technical models are set up to calculate ships' performance indicators.The soft time window-based penalty cost function is integrated into the synthetic evaluation system to optimize the ship types and design speeds simultaneously.The traditional fleet planning model is extended by introducing the speeds as variables.The responses for river-sea-going fleet are proposed towards the implement of ECAs in China.At the same time,the fleet's carbon trading model is set up based on METS.Finally,a nonlinear mixed-integer programming model is established with the target of minizing the cost and carbon emission based on former work.In the end,the NSGA-II algorithm is designed to solve the multi-objective optimization problem.The optimum renewal and operation strategy of a newly-built fleet is obtained after the calculation,and the impacts of ECAs and METS on the optimization result are analized,which indicates the significance of considering ECAs and METS in the fleet optimization.