.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

  1. The I/O Option Previously Supported Results controls the frequency of output for analytical results during an optimization.
  2. 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.