船用抗性排气熄火消声器的声学特性

Acoustic Characteristics of Reactive Exhaust Silencer with Spark Arrestor in Marine

采用Actran Vibroacoustic振动声学软件为消声器创建有限元仿真模型,以排气噪声的实际测量声压值作为输入激励,更准确地仿真排气消声的声学特性,并分析排气流速、温度对噪声衰减的影响,阐述气流速度、温度和声源类型对消声器消声性能和压力损失的影响。依据仿真模拟结果获取排气消声器内部的主要声共振频率,分析比较不同几何参数消声器的声压值和插入损失,进一步优化消声器的几何参数及方案。通过试验测量来评估验证排气消声器的消声性能。研究表明:这种抗性排气熄火消声器可有效减小发动机的噪声排放,降低油耗,提高船舶的行驶安全,其分析方法及验证方法稳健可靠。

Actran Vibroacoustic software is used to create a finite element simulation model for the silencer.Taking the actual measured sound pressure value of exhaust noise as the input excitation, it can more accurately simulate the acoustic characteristics of exhaust silencing, and analyze the influence of exhaust flow rate and temperature on noise attenuation. The effects of air velocity, temperature and sound source type on the silencing performance and pressure loss of silencer are described. According to the simulation results, the main acoustic resonance frequencies inside the exhaust silencer are obtained, the sound pressure value and insertion loss of the silencer with different geometric parameters are analyzed and compared, and the geometric parameters and scheme of the silencer are further optimized. The silencing performance of exhaust silencer is evaluated and verified by experimental measurement. The research shows that the resistant exhaust silencer can effectively reduce the noise emission of the engine, reduce fuel consumption and improve the driving safety of the ship. The analysis method and verification method are robust and reliable.