USS System
(Not recommended) Import uncertain systems into Simulink
Compatibility
Note
USS System block is not recommended. Use Uncertain State Space block instead.
Description
The USS System block accepts USS and UMAT containing
ureal
and ultidyn
uncertain objects, as well as ureal
and
ultidyn
objects. An instance of the uncertain
system is used in the simulation or linearization. Internally, USS models
are converted to their state space equivalent for evaluation.
Parameters
USS system variable
The uncertain object (USS, UMAT, ureal
, or
ultidyn
) is entered in the USS system
variable.
Initial states (nominal dynamics)
If the nominal value for the USS system variable has states, then the
initial condition for these states is entered in Initial
states (nominal dynamics).
Uncertainty value
The values for the uncertain elements are controlled by the
Uncertainty value
menu. If
Nominal
is selected, then the nominal
value of the uncertain object is used. If you select User
defined
, then you must enter a MATLAB® structure in the User-defined uncertainty
(struct)
dialog box. The field names of the
structure should correspond to the names of the uncertain atoms
within the USS system variable, while the values of the fields are
the values used for the uncertain objects (using the command
usubs
). If some of these values are SS
objects, then these states are referred to as uncertainty
states.
The order of the uncertainty states is determined by the order of
atoms in the Uncertainty property of the USS system variable. The
state dimension is determined by the actual data in the
User-defined uncertainty
structure. Any
extra fields in the User-defined uncertainty
structure are ignored.
User-defined uncertainty (struc)
If User defined
is selected from the
Uncertainty value
pop-up menu, then the
structure data entered in User-defined uncertainty
(struct)
must contain fields corresponding to
every uncertain atom of the USS system variable. Extra fields are
ignored. usimsamp
generates a random instance
of each atom in a Simulink® model. It returns a structure, suitable for entry in
User-defined uncertainty (struct)
.
Initial states (uncertain dynamics)
The initial condition for the uncertainty states is entered in
Initial states (uncertain
dynamics)
.
Version History
Introduced in R2007a