低噪声汽车电站的消声系统设计

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1、摘摘摘摘要要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

2、站的消声系统。关键词关键词：关键词：：：隔音墙；排气；噪声；消声器IAbstractAutomobileengine(dieselengine)exhaustnoiseisoneofthemainnoisesourceofautomobilenoise,controltheexhaustnoiseisthemosteffectivewaytousetheexhaustsystemexhaustmuffler.Designandhighattenuationperformance,lowresistanc

3、elossesofexhaustmufflercurrentlyexhaustnoisecontrolhasbecomeanimportantissueMufflerisonekindhasthelinerorspecialstructureform,caneffectivelyreducethenoiseofairflowcontrolpipe.Thenoisecontroltechnology,mufflerisamostextensiveapplicationofnoisereductionequ

4、ipment.Throughanalyzingdieselexhaustnoisefrequency,andcombinedwiththemufflerattenuationprincipleandthecharacteristicsoflownoisepowerstation,thisdesignimpedancecompositemuffler.Basedonthepreliminarymasternumericalanalysismethod,onthebasisoftheapplicationo

5、fnumericalsimulationanalysismethodcommonlyusedthemufflerattenuationperformanceandlaws,andthenanalyzescompositemufflerattenuationperformance,andproposespracticableimprovementscheme,thusdesignedfor75kwlownoiseautopowerstationimpedancecompositemuffler..keyw

6、ords：：：skeleton;materials;noise;andtheabsorptionII目目目目录录录录摘要............................................................................................................................................I1绪论..................................................

7、............................................................................................11.1汽车发展历史......................................................................................................................11.1.1世界汽车发展史.....................

8、....................................................................................11.1.2中国汽车发展史.........................................................................................................31.2汽车设计理论与设计技术.....