STEADY

Bulk Data Entry Defines the combination of frequency response and linear static subcases used for steady state analysis.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
STEADY ID NSTEPS TTIME
+ SUBID1 FREQ SCALE DPHASE
+ SUBID2 FREQ SCALE DPHASE
+ etc.

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
STEADY 10
11 10.0
12

Definitions

Field Contents SI Unit Example
ID Identification number of the STEADY Bulk Data Entry.

No default (Integer > 0)
NSTEPS Number of time steps for the conversion in time domain.

Default = Total time*Maximum frequency*24 (Integer > 0, or blank)
TTIME Total time for the conversion in time domain.

Default = 1.0/<minimum loading frequency> (Real or Blank)
SUBIDi Index of subcase. 2

No default (Integer > 0)
FREQ The frequency of a frequency response subcase used for steady state analysis. 3

Default = Blank (Real or blank)
SCALE Scaling factor for the displacements in each subcase.

Default = 1.0 (Real or blank)
DPHASE Phase lead for the displacements in each frequency response subcase.

Default = 0.0 (Real or blank)

Comments

  1. This entry is referenced in the subcase section using the STEADY Subcase Information Entry. The ANALYSIS Subcase Information Entry can be set to STEADY for the steady-state analysis subcase.
  2. Subcase type could be either direct or modal frequency response analysis or linear static analysis.
  3. If FREQ is specified, only the results of certain frequencies are used for conversion. If FREQ is blank, the results of all the frequencies are used for conversion. FREQ should be blank for linear static subcases.
  4. Steady state analysis subcases are supported for fatigue analysis. The LCID field of the FATLOAD Bulk Data Entry can point to the subcase ID of a steady state analysis subcase.
  5. The following results are currently supported for Steady State subcases:
    1. Displacement
    2. Stress
    3. Equivalent Radiated Power (ERP). For ERP in steady-state analysis, note that Frequency-dependent ERPRLF with TABLEDi in PANELG is not supported.
    4. Acoustic Pressure, including pressure results from Infinite Elements (IE) and Adaptive Perfectly Matched Layer (APML).
    5. Element Forces.