中置客车发动机进排气系统性能优化及试验研究

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1、AbstractInordertomeetthecomfortandincreasinglystrictnoiseregulationsofthecar,wemustrealizeeffectivenoisereducationfortheairintakeandexhaustsystemofthecar’Sengine．Howeverthestudyoftheoptimizationforairintakeandexhaustsystemofthecar’Sengineandit’Snoisereducationwere

2、notfull，largelyinfluencetheairintakeandexhaustsystemofthecar’Senginetoelevate．DFA6846MAastheIndependentresearchanddevelopmentnewmodelsofDONGFENGStationwagoncompany’Spassengercars，thenoisewasbigwhenit’Sacceleratingandituptoabove88dB(A)oftheoutsideofthecar,seriously

3、influencethepeoplearoundandtheenvironmentandalsonottoreachtherequestofNationalregulationswhichpointthatifthenoisewasmorethan76dB(A)wasnotreachtherequestoftheHigh．1evelbuses．Astheairintakeandexhaustsystemofthecar’Senginewasthemainsourseofthenoise，wemusttakesomemeas

4、urestoreducethenoiseoftheairintakeandexhaustsystemforthecar’Sengine．Theadvancedelectronicandcomputertechnologyandtherapiddevelopmentofmodernnumericalsimulationdesignmethodinengineeringfieldsuccessfullysolvingpracticalproblemsprovidedanewwayofthinkingforhowtostudyt

5、hevehicleengineintakeandexhaustsystemtoimprovetheoverallperformanceofpassengerengineandinreducingnoisesystem．Therefore，thisarticlewasonthebasisofoptimizetheintakeandexhaustsystemoftheDFA6846MAforthepurposeofimprovingvehicleengineexhaustsystemperformanceandreducing

6、thenoise．Weadopted“Systemarrangement．Modeloptimizationdesign-Experimentalstudy”etc．themethodsoftheoreticalanalysisandexperimentalresearchcombined．Themainjobandinnovationswereasfollows．(1)Pipingacousticstheorywasusedtoanalysisthegenerateofnosieattheaperturesofintak

7、eandexhaustsystem，weproposedtheoptimizationstrategyandprovidedthetheorybasisofhowtoimprovethepowerandtheeconomyofthevehicleandhowtoreducevehicleinandoutside’Snoise．(2)GT-powermodeloftheengine’sairintakesystemwasestablished，analysisthevelocityandthepressureoftheair

8、intakesystem，andgettheinfluencefactorsofemptyfilter’Sstructuralparameterstotheairintakesystem’Sperformance．Experimentresultsshowthatthenoisewasreducedaf