Frequency Domain and Frequency Domain Perturbation

Frequency Domain and Frequency Domain Perturbation

A Frequency Domain study step is used to compute the response of a linear or linearized model subjected to harmonic excitation for one or several frequencies. A Frequency-Domain Perturbation study step is used for studying small oscillations about a biased solution (small-signal analysis).

model.study(stdname).create(fname, "Frequency");

model.study(stdname).create(fname, "Frequencylinearized");

model.study(stdname).feature(fname).set(pname,value);

The following properties are available.

Table 6-122: Properties for Study Settings
Property	Value	Default	Description
linplistsolnum	integer array		List of solutions to use for the linearization point, when linpsolnum is set to from_list.
linpmanualsolnum	solution number		Solution number (index) to use for the linearization point, when linpsolnum is set to manual.
linpmethod	init \| sol	init	Method used for linearization point, which for sol is determined by the current solution (that is, the solution computed by the previous feature in the sequence).
linpsol	zero \| solution object	zero	Linearization point solution.
linpsolnum	all \| auto \| first \| last \| from_list \| interp \| manual \| solution number	current	Linearization point solution to use.
linpt	double		Interpolated point for the linearization point when linpsolnum is set to interp.
loadparameters	String		Load parameter values.
plist	Real vector		Frequencies.
preusesol	no \| yes \| auto	auto	Reuse solution from previous step.
punit	String	Hz	Frequency unit.

Table 6-123: Properties for Results While Solving
Property	Value	Default	Description
plot	on \| off	off	Plot while solving.
plotgroup	String	default	Plot group to use for plot while solving.
probes	Vector of strings		Probes to use when probesel=manual.
probesel	all \| none \| manual	all	Probes to compute.

Table 6-124: Properties for Physics and Variables Selection
Property	Value	Default	Description
activate	String Map		See Physics and Variables Selection
activateCoupling	String Map		See Physics and Variables Selection
activaterom	String Map		See Physics and Variables Selection
disabledcommon	Reference Array		See Physics and Variables Selection
disabledcoordinatesystems	Reference Array		See Physics and Variables Selection
disabledcoupling	Reference Array		See Physics and Variables Selection
disabledpair	Reference Array		See Physics and Variables Selection
disabledphysics	Reference Array		See Physics and Variables Selection
disabledreduced	Reference Array		See Physics and Variables Selection
disabledvariables	Reference Array		See Physics and Variables Selection
disableFrameControl	Reference Array		See Physics and Variables Selection
discretization	String Map		See Physics and Variables Selection
equationform	String Map		See Physics and Variables Selection
equationform_freq	String Map		See Physics and Variables Selection
equationform_freq_src	String Map		See Physics and Variables Selection
reconstructors	String Map		See Physics and Variables Selection
useadvanceddisable	on \| off	off	See Physics and Variables Selection.

Table 6-125: Properties for Values of Dependent Variables
Property	Value	Default	Description
initmethod	init \| sol	init	Method for initial values for variables solved for.
initstudy	String		Reference to study or "zero" for zero solution.
manualsolnum	Vector of integers	[1]	Index to solution for initial value for variables solved for.
notlistsolnum	Vector of integers	[1]	Indices to selected solutions for values for variables not solved for.
notmanualsolnum	Vector of integers	[1]	Indices to solutions for values for variables not solved for.
notsolmethod	init \| sol	init	Method for values for variables not solved for.
notsolnum	auto \| all \| first \| last \| from_list \| interp \| manual \| positive integer	auto	Solution selection for values for variables not solved for.
notstudy	String		Reference to study or "zero" for zero solution.
nott	String		Specify time for interpolated solution of values for variables not solved for.
solnum	auto \| first \| last \| interp \| manual \| positive integer	auto	Solution selection of initial values for variables solved for.
storesel	Vector of strings		Selections defining which field data to store.
t	String		Specify time for interpolated solution of initial value for variables solved for.
useinitsol	on \| off	off	User-controlled initial values for variables solved for.
usesol	on \| off	off	User-controlled values for variables not solved for.
usestoresel	all \| selection	all	Store fields in output.

Table 6-126: Property for Mesh selection
Property	Value	Default	Description
mesh	Vector of strings		Select meshes for geometries. The length of the vector is two times the number of geometries. Example value when two geometries geom1 and geom2 are available is: new String[]{"geom1","mesh1","geom2", "mesh2"}.

Table 6-127: Properties for Study Extensions
Property	Value	Default	Description
awe	on \| off	off	Use asymptotic waveform evaluation.
awefunc	Vector of strings		AWE expressions.
pcontinuation	String		Continuation parameter when pcontinuationmode = manual.
pcontinuationmode	no \| last \| manual	last	Determines if a continuation sweep should be performed for one of the parameters in pname.
pdistrib	on \| off	off	Distribute parametric sweep.
plistarr	Real matrix		List of parameter values. One row of values per parameter name.
pname	Vector of strings		Parameter names.
punit	String		Parameter units.
sweeptype	filled \| sparse	sparse	Sweep type: a filled or a sparse sweep.
useparam	on \| off	off	Auxiliary sweep.

For the adaptation and error estimates settings, see Properties for Mesh Adaptation and Error Estimates.