Data Flow Optimization Study Of Ocean-going Vessels Engine Room Based On Incremental Updating Method

As the size,automation and complexity of the marine power plant are improved continuously,the difficulty for fault diagnosis and maintenance increases gradually. Due to the barrier of communication,rough sea conditions,bad weather and other factors,it is hard for ocean-going vessels to obtain technical support from the manufacturers and maintenance center.Without this technical support from land,it's difficult for the ship's own crew to solve complex and practical problems independently.Therefore,it is an urgent issue at present to maintain the reliability of the ship power plant and design operating functions.In recent years,the rapid development of various applied technology,such as ship-to-shore communications, integrated navigation,data acquisition,electronic charts,makes a solid technical foundation for ocean-going vessel on-line monitoring system come true.Firstly,based on the urgent requirements of current on-line monitoring system, this paper analyses the present status of online monitoring system and describes the Ship Cargo Online Monitoring System(scom);secondly,it proposes an important improvement during data storage and communication in the online monitoring system,which is the incremental transmission.A broad platform for data storage and data processing is provided in the data warehouse with the charactorastics of subject-oriented,integrated,relatively stable and reflecting the historical changes; furthermore,based on the database,the characteristics and relevant functions of this database are introduced in Chapter 2 and Chapter 3,then,the database for incremental transmission is analyzed and created according to the characteristics of the database.Through the study of incremental algorithm,Chapter 4 presents a difference incremental algorithm which is suitable for the engine room data processing.Additionally,with the database,the incremental information treatment has been done to the information collected by the engine room.Time series residual method is employed in the classification of engine room data and the residual threshold data is calculated and the ultimate data transmission accuracy is settled according to the laws of statistics.According to the data accuracy,the real ship data incremental number has been processed in the last part of Chapter 4.Finally,this paper introduces that the text form is adopted in the modem ocean-going data transmission,and proposes the concept of binary transmission.With reference to the text of ASCII code transmission forms,the calculation of the actual amount of data is done.The results of research which have obviously advantages in solving large-scale ship-to-shore sustainable communications can significantly reduce the quantity of data communications,so this method will become the first choice of online monitoring system of data transmission.