Acceleration Output Request
Description: Requests acceleration vector output.
Format:
Example:
ACCELERATION = 25
| Option | Definition | Type | Default |
|---|---|---|---|
| Grid point accelerations will be output to both the Model Results Output File and the results neutral file system. | Character | ✓ | |
| PLOT | Grid point accelerations will be output only to the results neutral file system. | Character | |
| PUNCH | Grid point accelerations will be output additionally to the Model Results Punch File. | Character | |
| REAL or IMAG | Requests complex output in rectangular format (real and imaginary). | Character | ✓ |
| PHASE | Requests complex output in polar format (magnitude and phase). Phase output is in degrees. | Character | |
| ABS | Requests output as absolute displacement (see Remark 2). | Character | ✓ |
| REL | Requests output as relative displacement (see Remark 2). | Character | |
| PSDF | Power spectral density function, RMS, and number of positive crossings output request. | Character | |
| ATOC | Autocorrelation function output request. | Character | |
| RALL | Both PSDF and ATOC will be output. | Character | |
| ALL | Accelerations for all grid points will be output. | Character | ✓ |
| n | Set identification of previously appearing SET command. Only accelerations of grid points whose identification numbers appear on this SET command will be output. | Integer > 0 | |
| NONE | Grid point accelerations will not be output. | Character |
Remarks:
- ACCELERATION results are output in the global coordinate system. (See CD field on the GRID Bulk Data entry in Section 4, Bulk Data.)
- Relative acceleration output is only applicable to modal transient and linear direct transient response solutions. The reference point for relative motion is defaulted to the direct enforced motion input point. When direct enforced motion is not specified, the point with the largest mass in the model is used. The reference point may be specified explicitly using the DYNSOLRELGRID model parameter. See Section 5, Parameters, for more information on DYNSOLRELGRID.