Research On Energy Efficiency Optimization Method For Inland River Ship Fleet Based On Operational Data Analysis

Green,efficient and sustainable development has always been the goal of shipping industry.In recent years,International Maritime Organization(IMO)has launched mandatory measures to reduce the greenhouse gas emissions from ships.At the same time,the shipping industry is also exploring more energy efficient and environmentally friendly operation methods and management strategies,in order to reduce energy consumption and improve the economy of ship fleets.Improving energy efficiency is an effective way to reduce energy consumption and greenhouse gas emissions of in-service ships.In order to realize the comprehensive optimization of fleet energy efficiency under the influence of multiple factors,it is necessary to mine and analyze the data on fleet energy efficiency,establish single ship and fleet energy efficiency optimization models,and explore scientific and effective methods for the comprehensive optimization of fleet energy efficiency.In this paper,the inland river fleet is selected as the research object.The main influencing factors of ship energy efficiency are analyzed,and the operational data on the energy efficiency of single ship and fleet are collected and analyzed.On this basis,the energy efficiency optimization method of single ship and fleet are proposed based on the operational data analysis.This study can provide theoretical method and technical support for improving the energy efficiency of inland river fleet.The specific research contents and contributions mainly include the following aspects:(1)Design of an on-board energy efficiency data acquisition system and an on-shore data analysis platform.Based on the influencing factors and evaluation method of fleet energy efficiency,the required data on the fleet energy efficiency optimization is identified.An integrated system incorporating an on-board data collection system and an on-shore data analysis platform is designed,which lays the foundation for the data collection of fleet energy efficiency and the research of fleet energy efficiency optimization methods.(2)Research of single ship energy efficiency optimization method based on the operational data analysis.Based on the obtained operational data,the navigational environment,the ship energy efficiency level,the energy efficiency state of the propulsion system,and the relationship between the main influencing factors of ship energy efficiency are analyzed.A single ship energy efficiency model is established by combining theoretical analysis with experimental data.On this basis,two optimization methods of single ship energy efficiency based on the route division according to region and navigational environment are proposed,which can improve the operational energy efficiency of a single ship.(3)Research of fleet energy efficiency optimization method based on the operational data analysis.Based on the proposed evaluation method of fleet energy efficiency,the comparative analysis on the energy efficiency of ships within a fleet is carried out.On this basis,an optimization method of fleet energy efficiency considering multiple factors(e.g.navigational environment,transport demand,sailing time requriement and port operation time)is proposed.A nonlinear optimization model of fleet energy efficiency considering multiple factors is established,and the optimal sailing speeds of each ship within a fleet under different conditions are obtained by using an intelligent solution algorithm.Finally,the sensitivity of the main factors to the energy consumption of the fleet is analyzed.(4)Research of comprehensive optimization method of fleet energy efficiency based on the operational data analysis.Based on the optimization management process of fleet energy efficiency,a bi-level comprehensive optimization method of fleet energy efficiency is proposed,which mainly includes the upper-level operation decisions of fleet and the lower-level dynamic optimization of fleet energy efficiency based on real-time information.Through the establishments of a fleet operation decision-making model and a dynamic optimization model of fleet energy efficiency,the optimal cargo stowage of each ship and the dynamic optimization of fleet energy efficiency can be achieved,thus improving the energy efficiency of inland river fleet.