The high-power nonlinear load of the marine electric propulsion system will generate significant harmonic currents and cause grid voltage waveform distortion. The Electrical Transient Analyzer Program (ETAP) is used to establish the simulation model of the electric propulsion system of a survey ship, and perform the harmonic analysis and calculation. The simulation results show that the total harmonic distortion rates of the voltage are all within the specified range for the ship under various typical operating conditions. It can provide references for the harmonic processing of similar ships in the future.

This article focuses on the working efficiency of the scientific research ship with modular loads (mainly the research containers). The gain of modular loads to the work efficiency is analyzed through the comparison of the service situations of the scientific research ship with the different carrying capacities during one single voyage and the whole year. The ship borne research modular moving system is suggested to be equipped on the scientific research ship according to the increasing modularity.

The length of the pilot ladder for the embarkation and disembarkation of pilots is analyzed mathematically analyzed according to the requirements of latest international code of the pilot transfer arrangement. The layout of the current conventional pilot transfer arrangement is analyzed from the aspects of the usage and storage based on the ship type characteristics of the feeder container ship. The new proposed design optimization scheme can provide reference for the design of other ships.