吸声处理对舱室内空调噪声影响的数值分析

通风空调系统辐射噪声是船舶舱室内最主要的噪声源，吸声处理是降低舱室噪声的一种有效途径。为考察吸声处理对降低舱室噪声的效果，建立通风空调管路噪声向船舶舱内辐射的有限元法数值预报模型。以实测的管口声压为噪声源，研究舱室壁面及通风管路吸声对舱室降噪效果的影响，进而用于指导和改进船舶舱室的声学设计。对通风空调系统改变后的舱室噪声进行预报，并针对较高的噪声进行声学设计，使舱室噪声问题得到解决。

Numerical Analysis for Impact of Sound Absorption Treatment on Ship Cabin Noise Radiated from Air-conditioning System

The noise radiated from the air-conditioning system is a major source of noise in ship cabin, and the sound-absorption treatment is an efficient way to reduce the cabin noise. In order to examine the effect of sound-absorption on the noise reduction in cabin, the finite element predictive model of noise radiated from the ventilation pipe into the ship cabin is established. Taking the measured sound pressure as the noise source, the effects of sound-absorptions on cabin wall and ventilation pipe on the ship cabin noise reduction are investigated, which may be used to guide and improve the acoustic design of ship cabin. The cabin noise caused by air-conditioning system’s change is predicted, and the acoustic design is conducted for the specific higher noise, a satisfactory solution for reducing the noise level in cabin is obtained.