nastran manual


Case Control

MENU SEQUENCE:

 


The case control section is used to select loads and constraints for the analysis. It can also affect the output of the analysis (i.e. determining which data is written to files for recovery).

This window has two different parts: Input Data and Output Data.

Input data

Figure 19 – Input data Section

-Consider Acceleration: To consider the gravity effect (weight) of a structure, this option has to be checked.

Output Data

This section controls what output will be calculated and written to the output files. Undesired output types can be turned off.

Figure 20 – Output Section

-Title: Alphanumeric strings introduced in these statements have to start with a letter. These inputs appear at the start of every page of NASTRAN's output file. 

-Format File: These options determine the format that will be used for writing Bulk Data commands. By default, NASTRAN Interface uses Small field format (8 character fields). For an extra precision for some of your models, choose the large field formats (16 character fields). The large field formats produces larger files that are harder to read.

-Displacement, applied loads…These statements are used to make output requests for stresses, forces … as well as the calculated response of degrees of freedom used in the model.

-Output Design: Sets which kind of output file presentation is desired

         -Output Sort: Sets which sort is used for presentation.

·     SORT1: Output will be presented as a tabular listing of nodes for each load, frequency, eigenvalue or time depending on the rigid format. SORT1 is not available in transient problems (where the default is SORT2).

·     SORT2: Output will be presented as a tabular listing of load, frequency, or time for each node. SORT2 is available only in static analysis, transient, and frequency response problems.

-Output Device: Sets the presentation output device.

·     PRINT: A printer

·     NO PRINT: An output file. The output file will not be sent to the   output device.

·     PUNCH: A punch file. (.pch). This output file can be used in post process of GiD. (More information can be found in the Post Process      chapter).

-Complex eigenvalue or frequency response: Sets which kind of representation is desired for complex numbers.

·     PHASE: Requests magnitude and phase (0.0°  phase < 360.0°) on complex eigenvalue or frequency response problems.

·     REAL o IMG: Requests real or imaginary output on complex eigenvalue or frequency response problems.

-Auxiliary Output Points: Defines a series of points along the axis of a bar element (CBAR entry) for stress and force recovery output. A maximum of six internal points can be specified.

Remarks

1. All outputs have the same presentation.

2. An output request for ALL in transient and frequency response problems generally produces large amounts of printout. An alternative to this can be to define a set of parts of the model that are of interest, using output sets condition (For more information see the Advanced Conditions chapter).

Advanced Data

Figure 21 – Advanced Data

 

-Lines per printed page: Sets the number of data lines per printed page.

-Maximum number of output lines: Sets the maximum number of output lines (default 20.000).

-ECHO: Requests echo of Bulk Data Section.

                   Options         Meaning

                   SORT            Sorted echo will be printed

                   UNSORT        Unsorted echo will be printed

BOTH            Both sorted and unsorted echoes will be printed

                   NONE            No echo will be printed

PUNCH          The sorted Bulk Data Section will be punched onto statements