With the increase of the installed engine power and redundancy requirements, the specification of the engine room ventilation system has been expanded, imposing difficulties on the design and layout of the engine room. A compound engine room ventilation system is introduced by combining frequency conversion fans and water-cooled internal circulating system. The CFD method is utilized to simulate a ship under several basic working conditions, optimizing the parameters of engine room fans, the layout of engine room air coolers, and the nozzle angles of jet fans. The results show that the compound engine room ventilation system effectively reduces the specification of the engine room ventilation with improved economy and flexibility. It can provide a reference for the design of engine room ventilation system for similar vessels.

This article focuses on the vibration characteristics of the radar mast of a bulk carrier and the corresponding vibration reduction design. The finite element model of the radar mast is established according to the structure and layout drawings of the radar mast based on the finite element model of the whole ship. It is found that there is a resonance risk between the radar mast and the frequency pulsation pressure of the propeller blade through the modal analysis and vibration response analysis of the radar mast. After communicating with outfitting, electrical and other relevant fields, three vibration reduction schemes are proposed including reducing the height of the radar mast platform, strengthening the braced structure and increasing the counterweight block. The best scheme is selected according to the calculation results for final vibration reduction design of the radar mast, avoiding the vibration risk of the radar mast during the detailed design stage.

The ballast system and venting system are designed for the large semi-submersible vessel according to its characteristics. Having decided upon the ballast system of the whole ship, the venting system of the ship is determined as the common venting piping system. Specific measures are proposed to avoid the cumulative water inflow of the relevant tanks caused by the common venting piping system. The safety of the venting system are also analyzed under the worst damage conditions.

This article focuses on the rationality of the structural vibration finite element analysis model for the ship generator platforms, which is installed with large-scale equipment. A set of rapid, efficient and accurate finite element simulation methods are summarized for the vibration prediction of the generator platform by comparing the advantages and disadvantages of the different finite element simulation methods for the uniformly distributed mass and the large concentrated mass of the generator platform region. The finite element simulation method of the generator platform can quickly and accurately predict the natural frequency of the generator platform at the detailed design stage to avoid the resonance of the generator platform frame with the main excitation sources of the ship, such as the main engine and the propeller, thereby achieving the vibration control of the generator platform.