Mechanical APDL Structural Analysis Guide

4.8.3.1. Points to Remember

• The .RFRQ and .DB files from the harmonic solution, and the .MODE,.EMAT,.LMODE,.ESAV, and
  .MLV files from the modal solution must be available.


• The database must contain the same model for which the harmonic solution was calculated.

The procedure for the expansion pass follows:

4.8.3.2. Expanding the Modes

1. Reenter the ANSYS solution processor.
   Command(s):/SOLU
   GUI: Main Menu> Solution

Note

You must explicitly leave SOLUTION (using the FINISH command) and reenter (/SOLU)

before performing the expansion pass.

2. Activate the expansion pass and its options. ANSYS offers these options for the expansion pass:

Table 4.5: Expansion Pass Options

Com- GUI Path

mand

Option

Main Menu> Solution> Analysis Type> Expansion-

Pass

Expansion Pass On/Off EXPASS

Main Menu> Solution> Load Step Opts> Expansion-

Pass> Single Expand> Range of Solu's

No. of Solutions to Expand NUMEXP

Main Menu> Solution> Load Step Opts> Expansion-

Pass> Singe Expand> By Time Freq

Single Solution to Expand EXPSOL

Main Menu> Solution> Load Step Opts> Expansion-

Pass> Singe Expand> Range of Solu's

Phase Angle for Expansion HREXP

Main Menu> Solution> Analysis Type> Analysis

Options

Nodal Solution Listing HROUT

Format

Each of these options is explained in detail below.

• Option: Expansion Pass On/Off (EXPASS)

Choose ON.

• Option: Number of Solutions to Expand (NUMEXP,NUM)

Specify the number. This number of evenly spaced solutions will be expanded over a frequency

range (specified next). For example,NUMEXP,4,1000,2000 specifies four solutions in the frequency

range 1000 to 2000 (that is, expanded solutions at 1250, 1500, 1750, and 2000).

• Option: Single Solution to Expand (EXPSOL)

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Mode-Superposition Harmonic Analysis