1、 I 摘摘 要要 发动机排气噪声是汽车噪声的主要声源之一，控制排气噪声最有效的途径是在排气系 统上使用排气消声器。此次设计针对 75kW 起车电站的噪声分析而设计出适合 75kW 汽车 电站的消声系统。 通过分析柴油机排气噪声频率，结合消声器的消声原理和低噪声电站的特点，找出复 合式消声器设计参数的选择方法。 本文在初步掌握数值分析方法的基础上，应用数值仿真分析方法研究常用消声器的消 声性能和规律，进而分析复合式消声器的消声性能，也查阅了大量隔音墙原理，参照有关 知识提出了切实可行的改进方案，从而设计出适合 75kW 低噪声汽车电站的消声系统。 关键词：关键词：隔音墙；排气；噪声；消声器 II
2、 Abstract Automobile engine (diesel engine) exhaust noise is one of the main noise source of automobile noise, control the exhaust noise is the most effective way to use the exhaust system exhaust muffler. Design and high attenuation performance, low resistance losses of exhaust muffler currently ex
3、haust noise control has become an important issue Muffler is one kind has the liner or special structure form, can effectively reduce the noise of airflow control pipe. The noise control technology, muffler is a most extensive application of noise reduction equipment. Through analyzing diesel exhaus
4、t noise frequency, and combined with the muffler attenuation principle and the characteristics of low noise power station, this design impedance composite muffler . Based on the preliminary master numerical analysis method, on the basis of the application of numerical simulation analysis method commonly used the muffler attenuation performance and laws, and then analyzes composite muffler attenuation performance, and proposes practicable improvement scheme, thus designed for 75kw low noise au
