User`s guide

Simulating Model Output
Block
Description
IDNLHW Model
Simulate
idnlhw model in Simulink.
IDNLGREY Model Simulate nonlinear ODE (idnlgrey model object)
in Simulink.
After importing the model into Simulink, use the block parameter dialog box
to specify the initial conditions for simulating that block, as described in
“Specifying Initial Conditions for Simulation” on page 11-7. For information
about conguring each block, see the corresponding reference pages.
Specifying Initial Conditions for Simulation
For accurate simulation of a l inear or a nonlinear m odel, you can use default
initial conditions or specify the initial conditions for simulation using the
block parameters d ialog box.
Tip Double-click the block after adding it your Simulink model to open the
block parameters d ialog box.
Specifying Initial States of L inear Models
For linear models, the defa ult initial states are the states computed during
model estimation and stored by the
InitialStates model p roperty. For
idarx and id poly models, the defau lt initia l states are 0. For idproc, idss,
and
idgrey models, the InitialState s model p roperty can be nonzero values
after model estimation.
Because
idss an d idgrey models are state-space models, the denition of
initial states corresponds to the standard denition of states for state-space
representation. For
idproc, idpoly,andidar x models, the states are the
states of the corresponding state-spac e model. For example, suppose you have
the following
idpoly model:
m1=idpoly([1 2 1],[2 2]);
The initial states o f the previous model correspond to those o f the equivalent
state-space model:
11-7