周波数応答モデル

スペクトル解析を使用して得られる周波数応答モデル

"周波数応答モデル" は、周波数値の範囲で評価される線形システムの周波数応答です。このモデルは、周波数応答、サンプル時間、および入出力チャネルの情報を格納する idfrd モデルオブジェクトで表されます。

アプリ

測定データからの動的システムのモデルの同定

Estimate spectral model using time-domain data in the Live Editor (R2021b 以降)

`etfe`	経験的な伝達関数とピリオドグラムの推定
`spa`	スペクトル解析を使用した固定の周波数分解能による周波数応答の推定
`spafdr`	Estimate frequency response and spectrum using spectral analysis with frequency-dependent resolution
`idfrd`	周波数応答データまたはモデル
`getpvec`	モデルパラメーターと、関連する不確かさのデータを取得する
`setpvec`	Modify values of model parameters

What Is a Frequency-Response Model?
A frequency-response model is the frequency response of a linear system evaluated over a range of frequency values. The model is represented by an idfrd model object that stores the frequency response, sample time, and input-output channel information.
Estimate Frequency-Response Models in the App
You must have already imported your data into the app and performed any necessary preprocessing operations. For more information, see データの準備.
Estimate Frequency-Response Models at the Command Line
Estimate frequency-response models using etfe, spa, and spafdr commands.
Selecting the Method for Computing Spectral Models
How to select the method for computing spectral models during estimation in the app and at the command line.
Controlling Frequency Resolution of Spectral Models
Controlling frequency resolution of spectral models during estimation in the app and at the command line.
Spectrum Normalization
The spectrum of a signal is the square of the Fourier transform of the signal. The spectral estimate using the commands spa, spafdr, and etfe is normalized by the sample time T: