Frequency Response Function VI 的"FRF Mode" 是甚麼意思?

當在LabVIEW 裡用Frequency Response Function VI 時，我看到有一個輸入參數是FRF Mode。

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這是甚麼意思? 解答:FrequencyResponseFunctionVI的輸入FRFMode決定FrequencyResponse(Magnitude和Phase)如何被計算。

有三個FRFMode:H1,H2,和H3。

每個模式的資訊如下所示: H1)FrequencyResponseFunction 是 CrossSpectrum和輸入的Autospectrum 的比例:Gxy/Gxx。

基本上，CrossSpectrum是輸入和輸出之間的Power。

Autospectrum是多個即時頻譜(此處為輸入)Magnitude的平均。

更多的資訊對於如何CrossSpectrum和Autospectrum如何計算，隨上述連結。

H1技術提供最佳表現在非共振量測的雜訊上，通常此量測的SNR都很差。

H2)FrequencyResponseFunction  是輸出的Autospectrum和「Backwards」CrossSpectrum:Gyy/Gyx。

如上述所提，Autospectrum是多個即時頻譜(此處為輸出)Magnitude的平均。

「Backwards」CrossSpectrum是輸出與輸入之間的Power。

你可以隨給予的連結尋求更多Autospectrum和CrossSpectrum的資訊。

H2技術提供最佳表現在共振量測的雜訊上。

通常此量測的SNR是最好的。

在一個無雜訊的環境中，H1和 H2技術所得到的結果是一樣的。

H3) FrequencyResponseFunction是H1 和H2的平均。

相關連結: 附加檔案: 報告日期:04/18/2007 最後更新:07/31/2008 文件偏號:48H7P80E RelatedLinks OtherSupportOptions AsktheNICommunity Collaboratewithotherusersinourdiscussionforums SearchtheNICommunityforasolution RequestSupportfromanEngineer Avalidserviceagreementmayberequired,andsupportoptionsvarybycountry. Openaservicerequest Purchaseorrenewsupportservices Thissiteusescookiestoofferyouabetterbrowsingexperience.Learnmoreaboutourprivacystatementandcookiepolicy. Yes,Iaccept Whatdoyouneedourteamofexpertstoassistyouwith? Requestaquote Findtherightproduct Placeanorder Getsupportonaproduct Howcanwehelp? Pleaseenteryourinformationbelowandwe'llbeintouchsoon. Thisfieldisrequired Thisfieldisrequired Thisfieldisrequired Thisfieldisrequired Country Preferredcommunicationmethod Email Phonecall Send Thanks! We'llbeintouchsoon! Whatdoyouneedourteamofexpertstoassistyouwith? Requestaquote Findtherightproduct Placeanorder Getsupportonaproduct Howcanwehelp? Next Pleaseenteryourinformationbelowandwe'llbeintouchsoon. Thisfieldisrequired Thisfieldisrequired Thisfieldisrequired Thisfieldisrequired Country Preferredcommunicationmethod Email Phonecall Send Thanks! We'llbeintouchsoon!