The Graphical User Interface The model and data boards .2-2 The Working Data 2-3 The views The validation Data 2-4 The work flow 2-4 2-4 Workspace Variables 2-5 Help Texts 6 Handling Data 2-7 Getting Input-Output Data into the GUI Taking a Look at the Data 2-10 Preprocessing Data 2-11 Checklist for Data Handling 2-13 Simulating Data 2-13 Estimati 2-15 The basics 2-15 Direct Estimation of the Impulse Response 2-15 Direct Estimation of the Frequency Response 2-16 Estimation of parametric models 2-17 ARX Models ARMAX, Output- Error and box-Jenkins Models 2-23 State-Space Models 2-25 User Defined Model structures 2-26 Examining Models Views and models 2-28 The plot windows 2-29 Frequency Response and Disturbance Spectra Transient Response 2-31 Poles and zeros 2-31 Compare Measured and Model Output 2-32 Residual Analysis 2-32 Text Information LTI Viewer Further Analysis in the maTLAB Workspace 2-34ii Contents 2 The Graphical User Interface The Model and Data Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 The Working Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 The Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 The Validation Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 The Work Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Management Aspects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Workspace Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Help Texts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 Handling Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 Getting Input-Output Data into the GUI . . . . . . . . . . . . . . . . . . 2-8 Taking a Look at the Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Preprocessing Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 Checklist for Data Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Simulating Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Estimating Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 The Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 Direct Estimation of the Impulse Response . . . . . . . . . . . . . . . 2-15 Direct Estimation of the Frequency Response . . . . . . . . . . . . . 2-16 Estimation of Parametric Models . . . . . . . . . . . . . . . . . . . . . . . 2-17 ARX Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20 ARMAX, Output-Error and Box-Jenkins Models . . . . . . . . . . . 2-23 State-Space Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25 User Defined Model Structures . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 Examining Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 Views and Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 The Plot Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 Frequency Response and Disturbance Spectra . . . . . . . . . . . . 2-30 Transient Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Poles and Zeros . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Compare Measured and Model Output . . . . . . . . . . . . . . . . . . . 2-32 Residual Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 Text Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 LTI Viewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34 Further Analysis in the MATLAB Workspace . . . . . . . . . . . . . 2-34