UAINASTRAN User’s Reference Manual

1 Advanced CAE Applications for ProfessionalsSoftware that works for s Reference Manualfor Version ANALYTICS, ND-001 1993-1999 UNIVERSAL ANALYTICS, , California USAAll Rights ReservedFirst Edition, February 1991 Second Edition December 1992 Third Edition, April 1994 Fourth Edition, September 1995 Fifth Edition, December 1997 Sixth Edition, March 1999 Restricted Rights Legend:The use, duplication, or disclosure of the information contained in this document is subject to therestrictions set forth in your Software License Agreement with Universal Analytics, Inc. Use, duplica-tion, or disclosure by the Government of the United States is subject to the restrictions set forth inSubdivision (b)(3)(ii) of the Rights in Technical Data and Computer Software clause, 48 information contained herein is subject to change without notice.

2 Universal Analytics Inc. doesnot warrant that this document is free of errors or defects and assumes no liability or responsibility toany person or company for direct or indirect damages resulting from the use of any informationcontained ANALYTICS, Del Amo Blvd., Suite 370 Torrance, CA 90503 Tel: (310) 214-2922 FAX: (310) 214-3420 FOREWORDThe UAI/NASTRAN User s Reference Manual has been designed to provide you with all of thedetailed information necessary for you to create finite element models and perform analyses whichencompass a wide variety of analytical disciplines. The Manual includes eight CONTROL CONTROL PLOTTING PLOTTING DATA MATRIX ABSTRACTIONC hapter 1 provides you with information needed to execute UAI/NASTRAN on your host 2, 3, 4, 5, and 6 describe the different command structures which select analysis methods,control substructuring procedures, define boundary and loading conditions, and request graphicaloutput.

3 All of the detailed Bulk Data entries used to define analysis models is found in Chapter 8 provides you with descriptions of the DMAP modules that you may use to modify thestandard UAI/NASTRAN analyses and to import and export data to and from companion to this volume is the UAI/NASTRAN User s Guide. The Guide provides you withdetailed information on the modeling and analytical disciplines of the system. It includes descrip-tions of finite elements , hints to improve your modeling practices, examples of Bulk Data use andmany test problems and their solutions. It is strongly recommended that you review the User sGuide thoroughly before using a UAI/NASTRAN capability which is new to is a registered trademark of the National Aeronautics and Space AdministrationUser s Reference ManualUAI//NASTRANi This page is intentionally s Reference ManualiiUAI/NASTRANVERSION RELEASE NOTESThis section summarizes the specific input file differences between UAI/NASTRAN Version andprevious versions of the program.

4 This discussion is limited to a description of input data differ-ences, using the User s Reference Manual format. A more comprehensive discussion of new fea-tures and differences with respect to earlier versions of UAI/NASTRAN is presented in the ReleaseNotes section of the User s DOCUMENTATIONAs part of UAI s ongoing modernization program, all UAI/NASTRAN manuals, as well as those forother UAI software products, continue to be delivered in Adobe Portable Document File (PDF)format. This allows them to be used online with any computer having the Adobe Acrobat Reader(Version or higher). This reader is also delivered with our insure prompt updates to all documentation, any changes and enhancements may be down-loaded from UAI s Web site at TRACKINGB eginning with Version , the documentation has been slightly modified so that each page ofspecific commands and data entries has a revision date on it.

5 The two forms are: New: ,indicating that the page is new with the current release; and Rev: , which indicates that thepage has been modified for the current FEATURESV ersion contains several new features as well as many minor enhancements and bug correc-tions. These features include:+A new feature to perform automatic modal reductions, including Craig-Bampton, andautomatic static reduction. This feature allows models to be exported in the form ofDMIG Bulk Data entries. The exported models may then be use to couple structuralmodels from different sources. See Chapter 6 of the User s Guide for s Reference ManualUAI//NASTRANiii+ARCHIVE Database. Extensions have been added to the ARCHIVE database. Theseallow DMAP data block entities to be exported to, and imported from, DMAP solutionsequences.

6 See DMAP Chapter of this Manual .+Equivalent Beam Forces. New feature for computing equivalent beam forces(moments, shears, axial loads and torques) for sets of solid elements . See Chapter 5 ofthe User s Guide.+Mode Tracking in Design Optimization. A new capability in Design Optimizationallows the automatic tracking of modes. This is important during the redesignprocedure to capture "mode swapping" as the design changes. See Chapter 26 of theUser s following sections describe new features and modifications to UAI/NASTRAN input CONTROL PACKETCOMMANDSTATDESCRIPTIONAPPROACHREVC larification of the use of the various feature for:- defining groups of database entities- assigning groups to selected eBase databases. SECONVERTREVR equests execution of a new version of the MSC/NASTRANS uperelement feature to select or deselect the inclusion of MPC and RigidElement data in the CONTROL PACKETCOMMANDSTATDESCRIPTIONCOMBINEREVE nhanced to allow the new MATCH option for automaticallycombining GRID points with identical identification useful in conjunction with the SECONVERT CONTROL PACKETCOMMANDSTATDESCRIPTIONAUTOREDUCENE WNew Command for automatic Guyan reduction of a model .

7 (See also NLREDUCE)AUTOSPCREVNew feature to select or deselect the application of AUTOSPC toboth the g-set and n-set for nonlinear to allow multiple direct input damping s Reference ManualivUAI/NASTRANCOMMANDSTATDESCRIPTIO NBMFORCENEWNew feature for computing equivalent beam forces (moments,shears, axial loads and torques) for collections of solid for use with AUTOREDUCE and NLREDUCECASEREVNew features to select automatic Guyan reduction or Craig-Bampton modal feature to export a reduced model as direct matrix input atgrid points (DMIG).FORCEREVE xtended to support the enhanced feature to compute forces atelement integration to describe the use of the EQUIL ibrium option and itsrelationship to using initial to allow multiple direct input stiffness to allow multiple direct input mass name for automatic reduction of nonlinear models.

8 Inprevious versions, was to describe the enhancements for computing layer strainin composite material for Geometric Nonlinear analyses, andextension to allow strains to be calculated at the extreme fibers ofplate elements , or as strains and curvatures at the midsurface ofthe to describe the enhancements for computing layer stressin composite material for Geometric Nonlinear to support new OUPTUT2 interfaces with FEMAP to support the enhanced feature for computing strainsat element integration points, and typographic to support the enhanced feature for computing stressesat element integration s Reference ManualUAI//NASTRANvBULK DATA PACKETBULK DATA ENTRYSTATDESCRIPTIONACCELACCEL1 REVE xpanded description of orientation for use with AUTOREDUCE and feature for defining collections of solid elements forcomputing equivalent beam forces (moments, shears, axial loadsand torques).

9 CGAPREVC larification of coordinate system to include mode to include modal damping as a design for damping computations (Lanczos)EIGR (Givens)REVM odified to allow specification of mass orthogonality testparameter, E, in the Configuration description of orientation to allow computation of free-free surface description of orientation and expanded description of orientation to reflect the secant modulus solution description of orientation of use of enforced that allow integer and real sets to be specified in the BulkData set operations on integer sets defined by SETI Bulk Dataentries. Both Union and Intersection are to Reference only TABLED1 Bulk data of use of enforced s Reference ManualviUAI/NASTRANDMAP MODULESMODULE NAMESTATDESCRIPTIONDBINDBOUTDBPARMREVNew modules used to import and export eBase entities whenusing DMAP sequences.

10 These are often used in conjunction withthe new Executive Control command s Reference ManualUAI//NASTRANviiThis page is intentionally s Reference ManualviiiUAI/NASTRANTABLE OF CONTENTSFOREWORD .. iRELEASE NOTES .. iiiTABLE OF CONTENTS .. ixLIST OF FIGURES .. xiiiLIST OF TABLES .. xv1. EXECUTING THE PROGRAM .. OVERVIEW .. Executing UAI/NASTRAN .. The UAI/NASTRAN Configuration and Preference Files .. Executive Control Commands .. Dynamic Memory .. The eBase Database .. The INCLUDE Files .. UAI/NASTRAN Import/Export Files .. Host Computer Dependencies .. UNIX-BASED COMPUTERS .. Executing UAI/NASTRAN .. UAI/NASTRAN File Names .. ASSIGN and INCLUDE Command Parameters .. Site Definition of Automatic ASSIGN Commands .. The eShell Program.