PRFAR

PRFAR

PRFAR, Lab, Option, PHI1, PHI2, NPH1, THETA1, THETA2, NTHETA, VAL1, VAL2, VAL3, VAL4, VAL5, LDSTEP, SUBSTEP, FREQB, FREQE, --, LogOpt
Prints acoustic far field parameters.

POST1: Special Purpose

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

Lab

Parameters to print:

PRES	—	Acoustic parameters
PROT	—	Acoustic parameters with the y-axis rotated extrusion
PLAT	—	Acoustic parameters radiated by a vibrating structural panel

Option

Print option, based on the specified print parameter type:

Lab Option

`Lab`	`Option`
PRES, PROT, or PLAT	SUMC -- Maximum pressure (default) PHSC -- Pressure phase angle SPLC -- Sound pressure level SPAC – A-weighted sound pressure level (dBA) DGCT -- Acoustic directivity PSCT -- Maximum scattered pressure TSCT -- Target strength PWL -- Sound power level

PRES, PROT, or PLAT

SUMC -- Maximum pressure (default)

PHSC -- Pressure phase angle

SPLC -- Sound pressure level

SPAC – A-weighted sound pressure level (dBA)

DGCT -- Acoustic directivity

PSCT -- Maximum scattered pressure

TSCT -- Target strength

PWL -- Sound power level

The following arguments PHI1, PHI2, NPHI, THETA1, THETA2, and NTHETA are used only when Option = SUMC, PHSC, SPLC, SPAC, DGCT, PSCT, and TSCT:

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 Option = SUMC, PHSC, SPLC, SPAC, DGCT, PSCT, or TSCT.

VAL2

When Option = SPLC or SPAC: Reference rms sound pressure. Defaults to 2x10^-5 Pa.

When Option = PWL: Reference sound power. Defaults to 1x10^-12 watts.

VAL3

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

When Lab = PROT: Angle of the y-axis rotated extrusion model (no default)

VAL4

Mass density of acoustic fluid; used only when Lab = PLAT.

VAL5

Sound speed in acoustic fluid; used only when Lab = PLAT.

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 (FREQB to FREQE) for the defined load step(s) and substeps (SUBSTEP = ALL). If a SUBSTEP value is specified, FREQB is invalid.
Central frequency of octave bands, used when LogOpt = OB1, OB2, OB3, OB6, OB12, or OB24 and FREQE is blank.

FREQE

Ending frequency of the frequency range (FREQB to FREQE) for the defined load step(s) and sub-steps (SUBSTEP = ALL). If blank, FREQE is set to FREQB. If a SUBSTEP value is specified, FREQE is invalid.

--

Unused field.

LogOpt

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

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.

Notes

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

Printing 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 SF,MXWF command.

Menu Paths

This command cannot be accessed from a menu.