Abstract: To investigate the internal sound field of an enclosed cabin equipped with intake and exhaust ducts, numerical acoustic simulations were conducted using the acoustic module of the finite element software LMS Virtual Lab. The study focused on acoustic performance indicators such as the insertion loss of the intake and exhaust mufflers and examined the influence of the intake muffler on the cabin's sound field. The simulation results indicate that the pressure losses of the intake and exhaust mufflers are 19 kPa and 72 kPa, respectively, both meeting the design requirements. Within the frequency range of 20 Hz to 20 kHz, the insertion loss of both mufflers generally complies with the standard, though certain frequency bands still require further optimization. Specifically, the overall noise reduction effect of the intake muffler is slightly lower than that of the exhaust muffler, while the exhaust muffler’s noise attenuation performance in the high-frequency band needs improvement. From the cabin perspective, installing mufflers in the intake duct effectively reduces mid- and high-frequency noise inside the cabin. Additionally, accumulated water in the cabin smooths the sound spectrum and reduces noise, with this effect gradually stabilizing as water depth increases. This study provides valuable insights for optimizing the acoustic design of ship cabins.

Key words: intake and exhaust mufflers, insertion loss, cabin, acoustic performance

摘要： 为研究配备进排气管路的封闭舱室内部声场，该文采用有限元软件LMS Virtual.Lab中的声学模块进行数值仿真，重点分析了进排气消声器的插入损失等声学性能指标，并探讨了进气消声器对舱内声场的影响。仿真结果表明：进气消声器的压力损失为19 kPa，排气消声器的压力损失为72 kPa，均满足设计要求;在20 Hz ~ 20 kHz频率范围内，2种消声器的插入损失基本达标，但部分频段仍需优化。具体而言，进气消声器的消声效果整体略低于排气消声器，排气消声器在高频段的降噪效果则有待提升。从舱室角度分析，消声器安装在进气管道中能够有效降低舱室内中高频段噪声;此外，舱内积水可平滑声谱、降低噪声，且该效果随水深增加而逐渐趋于稳定。该研究为船舶舱室声学设计的优化提供了重要参考依据。

关键词: 进排气消声器, 插入损失, 舱室, 声学性能