轿车柴油发动机及整车配装的nvh试验分析

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1、中文摘要从国际汽车发展趋势来看，轿车动力柴油化已成为轿车发展的趋势，人们逐步认识到柴油机轿车是当今保持汽车大批量、低成本生产中解决环保与节能双重压力的最实际、最有效的手段之一。本论文研究的丰要目的是使搭载广西玉柴机器股份有限公司的YC4W-3l柴油机的天津一汽夏利汽车股份有限公司Vela轿车的NVH特性满足高级轿车有关标准。本文对汽车NVH性能研究主要从汽车加速行驶车外噪声、匀速行驶车内噪声、行驶平顺性、定置噪声等方面进行评价。以YC4W-31柴油机为主要研究对象，进行整机噪声、排气噪声测试评价，噪声源分析，并与丰田8A汽油机整机噪声测试结果进行比较分析；对YC4

2、W-31柴油机的噪声分析为进一步控制柴油机整机噪声提出了改进的方向和目标。对搭载YC4W-31柴油机的Vela轿车进行改进研究，对排气消声器进行设计与产品试验，对动力总成悬置系统(包括悬置点位置、悬置刚度和阻尼等参数)进行优化设计，使整车能够满足NVH性能的要求。本文同时对搭载丰田5A的Vela轿车和搭载柴油机的Jetta轿车NVH性能测试结果进行比较分析。通过研究工作可知，柴油动力Vela轿车的加速行驶车外噪声、行驶平顺性满足国标要求，柴油机噪声及整车配装还有大量改进工作需要继续研究。关键词：柴油机轿车NVHABSTRACTFromtheintemational

3、automobiledevelopment,thedieselpowercarshavebecomethevehicle’Strend．Peoplehavegraduallycometorealizethatproducingdieselcarsisoneofthemostpracticalandmosteffectivemeanstoreduceenvironmentalpressuresandenergyconservationpressuresinconditionofvehiclemass，low-costproduction．TheNVHcharacte

4、risticsofVelawithYC4W一31dieselengineofGuangxiYuchaiEngineCo．Ltd．，producedbyTianjinYiqiXialiAutomobileCo．Ltd．，hasbeenstudiedinthepapertobeinaccordwiththestandardsofhigh-rankingsedans．ThispapermainlystudiessuchvehicleNVHpropertiesasthenoiseoutsidetheacceleratedCar,thenoiseinsidetheavera

5、ge·drivingCar,itsfidecomfortandthesetnoise．DieseltoYC4W-31isselectedasthemainresearchobject．Thepaperdoesresearchonitspieceofnoise，exhaustnoiseevaluationandthesourcesofnoise，andmakescomparativeanalysisoftestresultsofToyota8AGasolineEngineNoise．YC4W一31NoiseAnalysisofDieselEnginegivesUSt

6、hedirectionandgoalinfurtherimprovingnoisecontr01．ThepaperalsostudiesonhowtoimproveVelaofdieselcarscarryingYC4W一31，designsandteststheexhaustmufflerproducts，givestheoptimaldesignforthepowermountingsystem(includingthemountposition，mountstiffnessanddampingparameters)andmakesthevehiclemeet

7、therequirementsforNVHperformance．ThispaperfinallyanalyzesonthedifferencebetweenNVHperformancetestresultsoftheVelacarrying5AToyotaandJettacarscarryingdiesel．Throughresearch，wecanseethatthenoiseoutsidetheacceleratedCaranditsridingoftheDieselEngineVelameetthenationalstandard．However,alot

8、ofwor