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便携式车内噪声舒适度测试仪的研究与设计的中期报告AbstractTheresearchanddesignofaportablecarinteriornoisecomforttestinginstrumentisaprojectaimedatimprovingthecomfortandsafetyofcardriving.Thereportpresentedhereisthemidtermreportforthisprojectanddescribestheprogressmadesofarinaccomplishingtheobjectivesoftheproject.IntroductionTheprojectaimstodesignanddevelopaportablecarinteriornoisecomforttestinginstrumentthatcanbeusedtomeasurethelevelofnoiseinsideacarandevaluatethecomfortabilityofthecarinterior.Theinstrumentshouldbeabletomeasuretheacousticenvironmentofacarinterior,includingthenoiselevel,thefrequencyspectrum,andthesoundpressurelevel.Theinstrumentshouldalsobeportable,easytouseandreliable.MethodsTheprojectstartedwithresearchonthedesignanddevelopmentofcarinteriornoisetestinginstruments,relevantstandards,andtherequirementsofdifferentnoisetestingscenarios.Aftertheliteraturereview,ageneraldesignframeworkwasformulatedfortheproject,withdetailedrequirementsandspecificationsforeachcomponentoftheinstrument.Thenextstepwastodesignthehardwareandsoftwareofthetestinginstrument.Thehardwaredesignincludestheselectionofsensors,dataacquisitioncards,filters,andamplifiers,whilethesoftwaredevelopmentincludesthedesignofsignalprocessingalgorithms,userinterfaces,anddataloggingsystems.ResultsThehardwaredesignofthetestinginstrumenthasbeencompleted,andthecomponentshavebeenselectedbasedontheprojectrequirements.Theselectedsensorsincludeasoundlevelmeter,amicrophone,andaccelerometers,whichareusedtomeasurethenoiselevel,thefrequencyspectrum,andthevibrationofthecarbody,respectively.Thedataacquisitioncardischosentoensurereliableandhigh-qualitydataacquisitionwithnoisereductionandfilteringcapabilities.Thesoftwaredevelopmentisinprogress,andthesignalprocessingalgorithmsforthecollecteddataarebeingdeveloped.Agraphicaluserinterfaceisalsobeingdesignedtoenableuserstocontrolandmonitorthetestinginstrument.ConclusionTheprojectisprogressingwell,withthehardwaredesigncompletedandsoftwaredevelopmentunderway.Thetestinginstrumentisexpec
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