排氣消聲器仿真計算與優(yōu)化設計.pdf

1、廣西大學碩士學位論文排氣消聲器仿真計算與優(yōu)化設計姓名：羅振華申請學位級別：碩士專業(yè)：動力機械及工程指導教師：黃錦成20080628SIMULATIoNANDoPTIMIZ√～TIoNDESIGNoFMUFFLERABSTRACTInthispaperweresearchthemufflerproducedbyGuilinMufflerFactoryfor6DF2—26dieselengineTheanalysisoftestresult

2、sshowsthat，theexhaustnoisehasbeenreducedfrom120dB(A)to105dB(A)，whichmeansthepowerlossratioofthisengineismorethan44％BasedonthebasictheoryofnoisecontrolandoptimaldesignGTPoweractualizesthesimulation，experimentationandoptim

3、izationofthetargetmuffleWesetupagoalsystemofnoisereducingof6DF2—26dieselengineAfterthat，westudythesimulationofnoisereducecapacitythroughbothFourTerminalNetworkMethodandGTPowerAccordingtotheexperimentalresults，wefindthatt

4、hesimulationofthetwomeanscanbothreflectthetendencyofnoisereducingeffectivelyinallconditionsComparedtoFourTerminalNetworkMethod，thesimulationofGTPowerseemstobemuchfasterandpreciseByprogramminginsertionlossbytheestablishme

5、ntofsoundmathematicalmodelsdetailedanalysisofthesimpleexpansionofthecalculationofintubateandexpansionofsounddevicesthanexpansion，theexpansionofthelengthtailpipelength，suchasstructuralparameterswithinintubatedlengthofthei

6、mpactofnoiseonacousticperformanceof；Hemuhuoziresonanceandperforationofresearchandanalysisonthestructuralresonancenoiseparametersresonanceofsize，puncturewoundsonthecross—sectionalareaandperforationratesofsoundeffectssuchl

7、aws；Inaddition，accordingontheresultsofanalysis，thepaperhasmodifiedthestructureofmuffleandsimulatedthemuffletoconfirmtheoptimisticdirectionFinallyonthepremiseofconsideringthereductionofmufflernoiseandpressureloss，theoptim

8、umdesignofsomestructuralparametersofonetypeofmufflerisaccomplishedAftertheoptimumdesign，theperformanceoftheexhaustmufflerisimprovedAccordingtotheexperimentalresultsoftheoptimizedmufflertheextentofnoiseeliminationinallfre