無需次路徑建模的振動(dòng)噪聲有源控制.pdf

1、北京機(jī)械工業(yè)學(xué)院碩士學(xué)位論文無需次路徑建模的振動(dòng)噪聲有源控制姓名：王宗鋒申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：控制理論與控制工程指導(dǎo)教師：張奇志20070301摘要AbstractActivenoisecontrol(ANC)basedondestructiveinterferencebetweensoundwavesisaneffectivemethodtocontrollowfrequencynoises，whichhasreceivedmore

2、andmoreattentioninrecentyearsDuetothecomplexityandtimevariationofacousticssystem，adaptivetechnologiesaremainlyusedinactivenoisecontrolfieldsThefeedforwardadaptivecontrolisthemosttypicalstructureofacfivenoisecontr01Inthis

3、thesisallactivenoisecontrolmethodbasedonsimultaneousequationiSdescribedindetailControlarithmeticsbasedOlladaptivefiltersandtheleastmeansquare(LMS)arewidelyusedinactivenoisecontr01Inalloftheactivenoisecontrolalgorithmsbas

4、edonmodelcontrol，thesecondaryacousticpathmustbeestimatedinadvance，andisappliedaStheinitialparametertocontrolnoisesHowevertheapparentdefectoftraditionalmodelcontrolmethodsliesinitsdependenceonthemathematicalmodeloftheseco

5、ndaryacousticpath，thatis，thesemethodscan’tworkwhenthesecondaryacousticpathchangesSimultaneousequationmethodprovidesanewapproachforactivenoisecontrolresearchItdoesn’tdependonthemathematicalmodelofthesecondaryacousticpath，

6、ie，theparametersofthecontrolledsystemdon’tneedtoberecognizedinadvanceAftersettingtwogroupsofparametersoftheadditionalfilterthesimultaneousequationcanbebuiRfromthemeasuredrefefenceanderrorsignals，andthentheparametersofcon

7、trollercanbeconvenientlyobtainedSimulationsofFilteredXLMSandsimultaneousequationmethodhavebeenpresentedinthisthesis，andaccordinglyexperimentshavebeenperformedonthetubesystemandheadsetsystemdesignedinOurlabResultsofsimula

8、tionsandexperimentsshowthatcontroleffectsofthesetwoalgorithmsareequalwhenthesecondaryacousticpathischangeless；controleffectsofsimulationequationarebetterthanthatofFilterxLMSwhenthesecondaryacousticpathchangesKeywords：Act