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.

In view of the problem that the superstructure vibration of a feeder container vessel exceeds the allowable standard during the sea trial, the on-site analysis of the reasons for the vibration of the ship superstructure was carried out at sea based on the vibration test results of the real ship and the vibration calculation report of the finite element numerical simulation. Meanwhile, a practical structural strengthening plan is proposed to strengthen the pillars of the superstructure directly at sea according to the structural form of the vessel, the internal outfitting, and the layout of equipment such as material cranes and lifeboats. After strengthening, the vibration results of each test position of the superstructure can meet the requirements of the specifications. This not only avoids the high cost of the second sea trial, but also provides the necessary conditions for the smooth delivery of the vessel.

Serious ship vibration not only affects the accommodation comfort of the ship, but also leads to the fatigue damage of the hull structure and reduces the accuracy and the service life of ship equipment and instruments. Therefore, the ship vibration must be fully considered in the ship design stage. It mainly focuses on the simulation of the propeller-induced fluctuating pressure in the finite element calculation of the vibration response of a feeder container vessel. Three simulation methods are proposed for the propeller-induced fluctuating pressure according to the distribution of the fluctuating pressure measured in the propeller cavitation test and the fluctuating pressure induced by the propeller. A fast, efficient and accurate finite element method is finally selected for the simulation of the propeller-induced fluctuating pressure through the comparative study of the differences of the calculation results of the three simulation methods. The overall ship vibration response analysis of a feeder container vessel is conducted by applying the propeller-induced fluctuating pressure simulation method to predict and control the ship vibration. The vibration test of the full scale ship proves that the ship has good vibration performance.

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.