**PLFAR**,
* Lab*,

`Option`

`PHI1`

`PHI2`

`NPH1`

`THETA1`

`THETA2`

`NTHETA`

`VAL1`

`VAL2`

`VAL3`

`VAL4`

`VAL5`

`LDSTEP`

`SUBSTEP`

`FREQB`

`FREQE`

`PlotType`

`LogOpt`

Compatible Products: – | – | – | Enterprise | Ent PP | Ent Solver | –

`Lab`

Parameters to plot :

**PRES**—

Acoustic parameters

**PROT**—

Acoustic parameters with the y-axis rotated extrusion

**PLAT**—

Acoustic parameters radiated by a vibrating structural panel

`Option`

Plot option, based on the specified plot parameter type:

`Lab`

`Option`

PRES, PROT, *or*PLATSUMC -- Maximum pressure in Cartesian coordinate system plot (default)

SUMP -- Maximum pressure in polar coordinate system plot

PHSC -- Pressure phase angle in Cartesian coordinate system plot

PHSP -- Pressure phase angle in polar coordinate system plot

SPLC -- Sound pressure level in Cartesian coordinate system plot

SPLP -- Sound pressure level in polar coordinate system plot

SPAC – A-weighted sound pressure level in Cartesian coordinate system plot (dBA)

SPAP – A-weighted sound pressure level in polar coordinate system plot (dBA)

DGCT -- Acoustic directivity in Cartesian coordinate system plot

DGPL -- Acoustic directivity in polar coordinate system plot

PSCT -- Maximum scattered pressure in Cartesian coordinate system plot

PSPL -- Maximum scattered pressure in polar coordinate system plot

TSCT -- Target strength in Cartesian coordinate system plot

TSPL -- Target strength in polar coordinate system plot

PWL -- Sound power level

The following arguments PHI1, PHI2, NPHI, THETA1, THETA2, and NTHETA are used only when

= SUMC, SUMP, PHSC, PHSP, SPLC, SPLP, SPAC, SPAP, DGCT, DGPL, PSCT, PSPL, TSCT, and TSPL:`Option`

`PHI1, PHI2`

Starting and ending φ angles (degrees) in the spherical coordinate system. Defaults to 0.

`NPHI`

Number of divisions between the starting and ending φ angles for data computations. Defaults to 0.

`THETA1, THETA2`

Starting and ending θ angles (degrees) in the spherical coordinate system. Defaults to 0 for a 3-D model and 90 for a 2-D extrusion model.

`NTHETA`

Number of divisions between the starting and ending θ angles for data computations. Defaults to 0.

`VAL1`

Radius of the sphere surface. Used only when

= SUMC, SUMP, PHSC, PHSP, SPLC, SPLP, SPAC, SPAP, DGCT, DGPL, PSCT, PSPL, TSCT, or TSPL.`Option`

`VAL2`

When

= SPLC, SPLP, SPAC, or SPAP: Reference rms sound pressure. Defaults to 2x10`Option`

^{-5}Pa.When

= PWL: Reference sound power. Defaults to 1x10`Option`

^{-12}watts.`VAL3`

When

= PRES: thickness of 2-D model extrusion in the z direction (no default).`Lab`

When

= PROT: angle of the y-axis rotated extrusion model (no default).`Lab`

`VAL4`

Mass density of acoustic fluid; used only when

= PLAT.`Lab`

`VAL5`

Sound speed in acoustic fluid; used only when

= PLAT.`Lab`

`LDSTEP`

Specified load step. Defaults to the load step number specified on the

**SET**command, or defaults to 1 if**SET**has not been issued.`n`

—

Load step number.

**ALL**—

All load steps.

`SUBSTEP`

Specified substep. Defaults to the substep number specified on the

**SET**command, or defaults to ALL (all substeps at the specified load step) if**SET**has not been issued.`n`

—

Substep number.

**ALL**—

All substeps.

`FREQB`

Frequency value representing one of the following:

Beginning frequency of the frequency range (

to`FREQB`

) for the defined load step(s) and substeps (`FREQE`

= ALL). If a`SUBSTEP`

value is specified,`SUBSTEP`

is invalid.`FREQB`

Central frequency of octave bands, used when

= OB1, OB2, OB3, OB6, OB12, or OB24 and`LogOpt`

is blank.`FREQE`

`FREQE`

Ending frequency of the frequency range (

to`FREQB`

) for the defined load step(s) and sub-steps (`FREQE`

= ALL). If blank,`SUBSTEP`

is set to`FREQE`

. If a`FREQB`

value is specified,`SUBSTEP`

is invalid.`FREQE`

`PlotType`

Type of plot:

**ANGX**—

x-y chart with angle as the x-axis variable (default).

**FRQX**—

x-y chart with frequency as the x-axis variable.

**CONT**—

Waterfall diagram with a field parameter contour.

`LogOpt`

Octave bands (used only when Option = SPLC, SPLP, SPAC or SPAP):

**OB0**—

Narrow bands (default).

**OB1**—

Octave bands.

**OB2**—

1/2 octave bands.

**OB3**—

1/3 octave bands.

**OB6**—

1/6 octave bands.

**OB12**—

1/12 octave bands.

**OB24**—

1/24 octave bands.

The **PLFAR** command plots pressure far fields and far field parameters as
determined by the equivalent source principle. Use this command to plot pressure and acoustic
parameters. See the **HFSYM** command for the model symmetry and the
**HFANG** command for spatial radiation angles.

Plotting acoustic parameters radiated by a vibrating structural panel
(* Lab* = PLAT) is supported by elements
SOLID185, SOLID186,
SOLID187, SHELL181,
SHELL281, and SOLSH190. The vibration surface
of the panel must be flagged by the

A maximum of ten curves can be plotted on a 2-D chart.

The waterfall diagram displays the field parameter contour with variables (frequency, angle), except for sound power level which has the variables (frequency, rpm). The waterfall diagram is plotted only in Cartesian coordinates.