Research On The Characteristic Of Hull Structure Vibration And Sound Radiation

For the underwater structure, ship vibration caused by power plant is one of the main vibration source. Fixed-base structure is used to unit power plant on the hull, the base dynamic characteristics of underwater structure vibration isolation and noise control is of great significance. Shell is the direct radiated noise structure contacted the fluid medium with underwater structure. Therefore, the research of base and the shell structure about the power and vibration transmission characteristics are important for the underwater structure.This article includes the following aspects: First, the structure of the underwater cabin modal analysis and frequency response analysis get some important conclusion about the cabin of underwater structure include the dynamic characteristics of the base, the shell, the transverse bulkheads and the platform structure. Second, by changing the geometric parameters such as base panel thickness, base web thickness, base elbow plate thickness, base elbow plate amount and the shell thickness,have a research on the transmission rate of the various parameters. Draw panel thickness, web thickness, elbow thickness, elbow plate amount and the shell thickness on the transmission characteristics are investigated. Third, the use of finite element and boundary element method of combining, the structure of the underwater radiated power, radiation efficiency, sound pressure and sound intensity level is calculated and analyzed to study the geometric parameters (panel thickness, web thickness, elbow thickness, elbow plate amount and the shell thickness) on the radiated sound power, radiation efficiency, sound pressure and sound intensity level are investigated.