.pch file
The .pch file is a Nastran punch format results file.
File Creation
This file is created when the Nastran or PUNCH formats are chosen. (See documentation for the I/O Option OUTPUT).
File Contents
| Result | Description |
|---|---|
| Acceleration | Acceleration results from
frequency response, acoustic, transient response, and multibody
dynamics analyses. Output is controlled by the I/O Option ACCELERATION. |
| Density | Density results from
topology optimizations. Output is controlled by the I/O Option DENSRES. Note: Density results are
reported as von Mises Strains.
|
| Displacement | Displacement results from
static, frequency response, acoustic, and transient response
analyses. Output is controlled by the I/O Option DISPLACEMENT. |
| Eigenvector | Eigenvector results from
normal modes analyses. Output is controlled by the I/O Option DISPLACEMENT. |
| Element energy loss per cycle | Element energy loss per
cycle and energy loss per cycle density output from frequency
response analysis. Output is controlled by the I/O Option EDE. |
| Element force | Element force results from
static, frequency response, acoustic, and transient response
analyses. Output is controlled by the I/O Option FORCE (or ELFORCE). |
| Element kinetic energy | Element kinetic energy and
kinetic energy density output from frequency response
analysis. Output is controlled by the I/O Option EKE. |
| Element strain energy | Element strain energy and
strain energy density results from static, normal modes and
frequency response analyses. Output is controlled by the I/O Option ESE. |
| Grid point stress | Grid point stress results
for 3D elements from static analysis. Output is controlled by the I/O Option GPSTRESS (or GSTRESS). |
| MPC force | Multi-point force of
constraint results from static, frequency response, acoustic, and
transient response analyses. Output is controlled by the I/O Option MPCFORCE. |
| PSD acceleration | Power spectral density
function of accelerations from random response analysis. 2
Output is controlled by the I/O Options XYPEAK, XYPLOT, and XYPUNCH. |
| PSD displacement | Power spectral density
function of displacements from random response analysis. 2 Output is controlled by the I/O Options XYPEAK, XYPLOT, and XYPUNCH. |
| PSD velocity | Power spectral density
function of velocities from random response analysis. 2 Output is controlled by the I/O Options XYPEAK, XYPLOT, and XYPUNCH. |
| PSD element strain | Power spectral density
function of element strains from random response analysis. 2 Output is controlled by the I/O Options XYPEAK, XYPLOT, and XYPUNCH. |
| PSD element stress | Power spectral density
function of element stresses from random response analysis. 2 Output is controlled by the I/O Options XYPEAK,XYPLOT, and XYPUNCH. |
| RMS element strain | Root mean square value of
element strains from random response analysis. Output is controlled by the I/O Options XYPEAK, XYPLOT, and XYPUNCH. |
| RMS element stress | Root mean square value of
element stresses from random response analysis. Output is controlled by the I/O Options XYPEAK, XYPLOT, and XYPUNCH. |
| SPC force | Single-point force of
constraint results from linear static analysis. Output is controlled by the I/O Option SPCFORCE. |
| Strain | Strain results from
static, frequency response, acoustic, transient response, and
multibody dynamics analyses. Output is controlled by the I/O Option STRAIN. |
| Stress | Stress results from
static, frequency response, acoustic, transient response, and
multibody dynamics analyses. Output is controlled by the I/O Option STRESS (or ELSTRESS). |
| Velocity | Velocity results from
frequency response analyses, acoustic, transient response, and
multibody dynamics. Output is controlled by the I/O Option VELOCITY. |
Comments
- The I/O Option Previously Supported Results controls the frequency of output for analytical results during an optimization.
- Multiple RANDOM Subcase Information Entries with non-unique ID's are allowed in a single model. Therefore, if the plot-type field on the XYPUNCH output request is set to PSDF, then the RANDOM ID will be added to the XYPUNCH headers in the corresponding result sections of the .pch file when multiple RANDOM entries are present in the same deck. If only one RANDOM entry is present, the RANDOM ID is not printed.