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Data based modeling of nonlinear dynamic systems using System Identification Toolbox


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Data based modeling of nonlinear dynamic systems using System Identification Toolbox



01 Sep 2010 (Updated )

Perspectives on nonlinear identification using a throttle valve modeling example.

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Using an engine throttle valve modeling example, this demo shares some perspectives on creation of nonlinear models of dynamic systems from the measurements of its input and outputs. It describes useful workflows for approaching the task of data-based modeling using System Identification Toolbox™ . Two modeling approaches are described:

1. Black box modeling: case where you cannot derive the exact mathematical representation of the system from physical considerations; the form of the model as well as the values of its coefficients is extracted from data.

2. Grey-box modeling: the equations of motion relating the input and output variables are known, but the values of various physical constants in the equations are unknown; the data is then used to find the values of those unknowns only.

The emphasis is on the black box modeling approach. It is shown that even though no a priori knowledge of model structure is required, it is often helpful to have some intuition about the nature of the system and to use this knowledge to fine-tune the configuration of model structures.


* MATLAB files for command line demo (see throttledemo.m)

Required Products Optimization Toolbox
System Identification Toolbox
MATLAB release MATLAB 7.10 (R2010a)
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09 Oct 2011 Mr Smart  
03 Sep 2010

zip content update

06 Sep 2010

Title change

07 Sep 2010


15 Nov 2010

update zip content

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