内燃机机械噪声和燃烧噪声的识别分离

第33卷第5期重庆大学学报Vol.33No.52010年5月JournalofChongqingUniversityMay2010:10002582X(2010)052016206王攀1,邓兆祥1,2,刘永超1,胡亮1(1.重庆大学机械工程学院,重庆400044;2.汽车NVH及安全控制国家重点实验室,重庆400039):2009212201:(CSTC2006BA7013):(19772),,,,NVH(),,,,(E2mail)[e-mail]:针对内燃机噪声识别问题,建立了数学模型并编制了相应的程序,在程序中加入作用全局阈值的小波变换降噪程序,保证程序的抗干扰性后,实现了燃烧噪声和机械噪声的频谱分离和A计权声功率级计算以某CG125型摩托车发动机为例,通过构造包含不同干扰噪声的理论算例仿真识别,验证了程序的准确性和实用性识别结果表明:分离前后的燃烧噪声和机械噪声的频谱吻合良好,A计权声功率级误差均小于0.6dB:机械噪声;燃烧噪声;噪声源识别;气缸压力;小波变换:TB533.2:AIdentificationofcombustionnoiseandmechanicalnoiseininternalcombustionengineWANGPan1,DENGZhao2xiang1,2,LIUYong2chao1,HULiang1(1.CollegeofMechanicalEngineering,ChongqingUniversity,Chongqing400044,P.R.China;2.StateKeyLaboratoryofVehicleNVHandSafetyControl,Chongqing400039,P.R.China)Abstract:Toidentifyinternalcombustionengine(ICengine)noise,amathematicalmodelisestablished,andthecorrespondingprogramisdeveloped.Byintroducingglobalthresholdstodecreasenoiseinthewavelettransformsprogram,theanti2interferenceoftheprogramcanbeguaranteed,thespectrumsofthecombustionnoiseandmechanicalnoiseareseparated,andtheirA2weightedsoundpowerlevelsarefiguredout.TakingaCG125stylemotorcycleengineforanexample,theoreticalexamplesthatincludedifferentinterferentialnoisesareconstructedtosimulatetheidentificationandtovalidatetheaccuracyandpracticabilityoftheprogram.Resultsoftheidentificationshowthatthespectrumsofthecombustionnoiseandmechanicalnoisebeforeandafterseparationareagreedwell;errorsofA2weightedsoundpowerlevelarealllessthan0.6dB.Keywords:mechanicalnoise;combustionnoise;noisesourceidentification;cylinderpressure;wavelettransforms,[1],,,,,,[225],[3][5],,,,,,,,,,()2,,,11.1,,,[6213],:1),(),2)(),1.2,:P1=Pm+H@PC1,(1)P2=Pm+H@PC2(2):P1P22;Pm;PC1PC22;H,(),(1)(2)LWC1=LW1+10lg1-100.1(LW2-LW1)1-100.1(LPY2-LPY1),(3)LWC2=LWC1+LPY2-LPY1,(4)LWm=LW1+10lg[1-100.1(LWc1-LW1)](5):LW1LW22();LPY1LPY22(),;LWc1LWc22();LWm,(),2(),,,A1.3,[8],,,,,[14215]1,:A;w;s;F;M;f:s,F,,,M,,,,,,17第5期王攀,等:内燃机机械噪声和燃烧噪声的识别分离,,,1222MATLAB2()PY1PY2,(6)(7)LPY1LPY2LPY1=20lgPY1P0,(6)LPY2=20lgPY2P0(7):PY1PY2;P0,2.0@10-5Pa,1s,1Hz,,,SURE(Stein),,SURE,(3)(4)(5),LPY1=LPY2=00,LWm=LW1,A(IEC)A,A33.1,,,,3318重庆大学学报第33卷3.2125416b20b(),0.32MPa,,245,:2000Hz,2000~5000Hz,,,5000Hz[16],(8)(9)2LWC1=LPY1-LA,(8)LWC2=LPY2-LA(9)LA,;,;,SURE,616b35619第5期王攀,等:内燃机机械噪声和燃烧噪声的识别分离3.322,2,1,,710,,,,,,71dB(A)10100.69103.07101.74100.14101.99102.551.050.551.080.5212100.69103.07101.25100.32102.35102.720.560.370.720.3516100.69103.07101.08100.50102.40102.860.390.190.670.2141),(),,,,2)20重庆大学学报第33卷3),:[1],,.[M].:,1999:67271.[2],.[J].,2006,39(4):4542457.GENAN,LIUYUE2HUI.Applicationofindependentcomponentanalysistodecompositionofengineacousticsignals[J].JournalofTianjinUniversity,2006,39(4):4542457.[3],.[J].,2007,36(4):82284.HEKAI,BIFENG2RONG.Experimentalanalysisofcombustionnoiseandmechanicalnoisecontributionformotorcycleengine[J].SmallInternalCombustionandMotorcycle,2007,36(4):82284.[4]BADAOUIME,DANIEREJ,GUILLETF,etal.Separationofcombustionnoiseandpiston2slapindieselengine,PartI:separationofcombustionnoiseandpiston2slapindieselenginebycyclicwienerfiltering[J].MechanicalSystemsandSignalProcessing,2005,19(6):120921217.[5]SERVIEREC,LACOUMEC,BADAOUIME,etal.Separationofcombustionnoiseandpiston2slapindieselengine,PartII:separationofcombustionnoiseandpiston2slapusingblindsourceseparationmethods[J].MechanicalSystemsandSignalProcessing,2005,19(6):121821229.[6]SHUGQ,LIANGXY.Identificationofcomplexdieselenginenoisesourcesbasedoncoherentpowerspectrumanalysis[J].MechanicalSystemsandSignalProcessing,2007,21(1):4052416.[7],.[J].,2004,10(1):56261.WEIHAI2QIAO,SHUGE2QUN.Cylinderpressureandcombustionnoiseofinternalcombustionengine[J].JournalofCombustionScienceandTechnology,2004,10(1):56261.[8],,.[J].,2002,22(3):44248.ZHENGDONG2LIANG,LIZHONG2FU,HUAHONG2XING.Ameasuringmethodforcombustionnoiseandmechanicalnoiseofinternalcombustionengine[J].NoiseandVibrationControl,2002,22(3):44248.[9]ZERVASE.ComparativestudyofsomeexperimentalmethodstocharacterizethecombustionprocessinaSIengine[J].Energy,2005,30(10):180321816.[10]LITAKG,TACCANIR,RADUR,etal.Estimationofanoiselevelusingcoarse2grainedentropyofexperimentaltimeseriesofinternalpressureinacombustionengine[J].Chaos,SolitonsandFractals,2005,23(5):169521701.[11]KAMINSKIT,WENDEKERM,URBANOWICZK,etal.Combustionprocessinasparkignitionengine:dynamicsandnoiselevelestimation[J].Chaos,2004,14(2):4612466.[12]WENDEKERM,LITAKG,CZARNIGOWSKIJ,etal.Nonperiodicoscillationsofpressureinasparkignitionengine[J].InternationalJournalofBifurcationandChaosinAppliedSciencesandEngineering,2004,14(5):180121806.[13]CHOIGM,TANAHASHIM,MIYAUCHIT.Controlofoscillatingcombustionandnoisebasedonlocalflamestructure[J].ProceedingsoftheCombustionInstitute,2005,30(2):180721814.[14],,,.[J].,2008,22(2):1402144.WANGJUN,ZHANGYOU2TONG,WANGXIAN2CHENG,etal.De2noisingofcylinderpressuresignalindieselenginebasedonwavelettransform[J].JournalofTestandMeasurementTechnology,2008,22(2):1402144.[15],.[M].:,2005:16219.[16],,,.[J].,2006,27(4):66269.WEIHAI2QIAO,SHUGE2QUN,LIANGXING2YU,etal.Multi2regressionanalysis