伝達関数モデル

アプリ

Identify models of dynamic systems from measured data

関数

`tfest`	Estimate transfer function
`idtf`	Transfer function model with identifiable parameters
`pem`	Prediction error minimization for refining linear and nonlinear models

`delayest`	Estimate time delay (dead time) from data
`getpvec`	Obtain model parameters and associated uncertainty data
`setpvec`	Modify values of model parameters
`getpar`	Obtain attributes such as values and bounds of linear model parameters
`setpar`	Set attributes such as values and bounds of linear model parameters
`tfdata`	伝達関数データにアクセスする
`init`	Set or randomize initial parameter values

tfestOptions Option set for tfest

例および操作のヒント

Estimate Transfer Function Models in the System Identification App

This topic shows how to estimate transfer function models in the System Identification app.

Estimate Transfer Function Models at the Command Line

This topic shows how to estimate transfer function models at the command line.

Estimate Transfer Function Models by Specifying Number of Poles

This example shows how to identify a transfer function containing a specified number of poles for given data.

Estimate Transfer Function Models with Transport Delay to Fit Given Frequency-Response Data

This example shows how to identify a transfer function to fit a given frequency response data (FRD) containing additional phase roll off induced by input delay.

Estimate Transfer Function Models With Prior Knowledge of Model Structure and Constraints

This example shows how to estimate a transfer function model when the structure of the expected model is known and apply constraints to the numerator and denominator coefficients.

Estimate Transfer Functions with Delays

This example shows how to estimate transfer function models with I/O delays.

Estimate Transfer Function Models with Unknown Transport Delays

This example shows how to estimate a transfer function model with unknown transport delays and apply an upper bound on the unknown transport delays.

Troubleshoot Frequency-Domain Identification of Transfer Function Models

Improve frequency-domain model estimation by preprocessing data and applying frequency-dependent weighting filters.

概念

What are Transfer Function Models?

Transfer function models describe the relationship between the inputs and outputs of a system using a ratio of polynomials. The model order is equal to the order of the denominator polynomial. The roots of the denominator polynomial are referred to as the model poles. The roots of the numerator polynomial are referred to as the model zeros.

Data Supported by Transfer Function Models

Characteristics of estimation data for transfer function identification.

Transfer Function Structure Specification

Specify the values and constraints for the numerator, denominator and transport delays.

Specifying Initial Conditions for Iterative Estimation of Transfer Functions

Specify how initial conditions are handled during model estimation in the app and at the command line.

Identifying State-Space Models with Separate Process and Measurement Noise Descriptions

An identified linear model is used to simulate and predict system outputs for given input and noise signals. The input signals are measured while the noise signals are only known via their statistical mean and variance. The general form of the state-space model, often associated with Kalman filtering, is an example of such a model, and is defined as:

注目の例

熱交換器向け伝達関数モデルの推定

この例では、測定信号データから伝達関数を推定する方法を示します。

スクリプトを開く

昇圧コンバーター向け伝達関数モデルの推定

この例では、周波数応答データから伝達関数を推定する方法を示します。

スクリプトを開く

System Identification Toolbox ドキュメンテーション

サポート

MATLAB、Simulink、その他の製品をお試しください

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