_s#_a.frf file

The _s#_a.frf file is an OptiStruct ASCII format results file.

File Creation

This file is only created for frequency response subcases. Creation of this file is controlled by the I/O Option OUTPUT.

File Contents

Result
Description
Acceleration
Acceleration results from frequency response analyses.
Output is controlled by the I/O Option ACCELERATION.

File Format

If the real and imaginary format was selected on the ACCELERATION card, the file starts with the following header:
Frequency"REA | X Trans"IMA | X Trans"REA | Y Trans"IMA | Y Trans"REA | Z Trans"IMA | Z Trans
If the phase and magnitude format was selected on the ACCELERATION card, the file starts with the following header:
Frequency"PHA | X Trans"MAG | X Trans"PHA | Y Trans"MAG | Y Trans"PHA | Z Trans"MAG | Z Trans
In either case the results are grouped by node with results for different nodes separated by a blank line. The format of each line after the header is:
Frequency X-rl/ph X-im/mag Y-rl/ph Y-im/mag Z-rl/ph Z-im/mag
Data
Description
Frequency
Frequency at which results are calculated.
X-rl/ph
Is either the real component in the x-direction or the phase angle in the x-direction component.
X-im/mag
Is either the imaginary component in the x-direction or the magnitude in the x-direction component.
Y-rl/ph
Is either the real component in the y-direction or the phase angle in the y-direction component.
Y-im/mag
Is either the imaginary component in the y-direction or the magnitude in the y-direction component.
Z-rl/ph
Is either the real component in the z-direction or the phase angle in the z-direction component.
Z-im/mag
Is either the imaginary component in the z-direction or the magnitude in the z-direction component.

Comments

  1. The # in the file name is the user-defined subcase ID from which these results are obtained.
  2. The _freq.mvw HyperView script file automatically creates plots for the results contained in this file.