genfrd
Generalized frequency response data (FRD) model
Description
Use a generalized FRD (genfrd
) model to represent a system having
both tunable control design blocks and a fixed numerical component expressed as
frequency-response data. genfrd
models keep track of how the tunable
blocks interact with the fixed frequency-response component. For more information about
generalized models with tunable components, see Generalized Models.
Creation
To construct a genfrd
model:
Use model interconnection commands such as
feedback
,series
,parallel
, orconnect
, or model arithmetic operators such as+
or*
, to combine a numericfrd
model with tunable control design blocks or other models containing control design blocks. For an example, see Connect Numeric Frequency-Response Data Model to Tunable Block.Use the
frd
command to sample agenss
model at a specified set of frequencies. For an example, see Sample Frequency Response of Generalized State-Space Model.Use the
genfrd
command to sample any numeric LTI model at specified frequencies. For an example, see Convert Numeric LTI Model to Generalized frd Model.
Syntax
Description
fsys = genfrd(
converts a static model or dynamic system model to a generalized FRD model and sets the
value of the sys
,frequency
)Frequency
property of fsys
. If
sys
is not an frd
model object, genfrd
computes the frequency response
at each point in frequency
. If sys
is an
frd
model, frequency
must match the values in
sys.Frequency
.
frdsys = genfrd(
further specifies the units of sys
,frequency
,frequencyunit
)Frequency
and sets the
FrequencyUnit
property of fsys
.
frdsys = genfrd(
further specifies the sys
,frequency
,frequencyunit
,timeunit
)TimeUnit
property of fsys
.
This syntax is useful when you convert a static model to genfrd
form
because the static model has no associated time unit.
Input Arguments
Properties
Object Functions
The following lists contain a representative subset of the functions you can use with
genfrd
models. In general, many functions applicable to generalized
state-space (genss
) models are also applicable to genfrd
models. genfrd
models do not work with any time-domain analysis functions.
Examples
Version History
Introduced in R2011a