NEi Software

Announcing NEi Nastran V9.2 Performance Enhancements

2008-11-04T14:20:00.000-08:00

NEi Nastran V9.2 Released 11/4/08

PERFORMANCE ENHANCEMENTS

• Improved nonlinear surface contact performance especially for models where previously a reduced SFACT was required to obtain convergence.

• Improved nonlinear analysis performance for models with large displacement effects enabled and linear materials.

• Added PCGLSS solver support for direct linear and nonlinear transient response analysis.

• Improved overall performance in all solutions.

Linear Analysis Enhancements

• Increased the tolerance for surface weld detection in Automated Surface Contact Generation (ASCG).

• Increased the allowable gap size for Automated Surface Contact Generation (ASCG) when a weld or offset weld type is specified.

• Improved linear contact analysis accuracy and robustness.

• Added PARAM, ADAPTLNCONTACT which controls the adaptive stiffness update method used in linear contact. When set to ON, each contact segment will adjust stiffness on each iteration to maintain a fixed penetration of 1 percent of the contact segment reference length dimension. When set to OFF, stiffness is not adjusted individually. The AUTO setting will use ON for contact segments with initial gap openings that are 10 percent of the contact segment reference length dimension.

• Added SPCD support for static load combination via the LOAD Bulk Data entry.

• Enhanced linear buckling analysis for models with quad elements. Nonlinear Analysis Enhancements

• Added nonlinear database restart via PARAM, NLINDATABASE from a nonlinear static to a nonlinear transient response analysis. The nonlinear database establishes the initial conditions including stress and strain state for the nonlinear transient response solution.

• Added PARAM, NLINDATALOADSF for specifying the initial load scale factor to be used when performing a nonlinear database restart (PARAM, NLINDATABASE, FETCH).

• Added PARAM, SLINEFACENORMTOL for specifying contact face normal tolerance and PARAM, SLINEEDGENORMTOL for specifying contact edge normal tolerance in Automated Surface Contact Generation (ASCG).

• Added PARAM, HPNLMATREDORD which controls the use of reduced order integration in hyperelastic material nonlinear analysis. When set to ON, the volumetric hyperelastic terms will use a one point integration.

• Added PARAM, NITERSUPDATE for specifying the number of iterations to freeze slide line and surface contact status when two successive solution divergences occur. NEi Nastran V9.2 is a major upgrade with over 85 customer driven enhancements. Major features include nonlinear composite progressive ply failure analysis, concrete material model, direct enforced motion, bolt preload, improved overall performance in all solutions, as well as enhanced rigid element features. The NEi Nastran Editor now has a new look and feel, and many enhancements have been included such as visualization support for various entities, automatic dynamic plots during nonlinear analysis, and transparent max/min labels.

Announcing NEi Nastran V92

• Added PARAM, SLINEOPENKSFACT for specifying the slide line and surface contact open gap stiffness scale factor.

• Added PARAM, SLINESTABOPTION for specifying the type of solution stabilization to be used when a model contains slide line or surface contact and the solution diverges. All options are active for PARAM, NITRERSUPDATE iterations only. When SLINESTABOPTION is set to 1, the contact status will be frozen. When set to 2, the open gap stiffness scale factor, PARAM, SLINEOPENKSFACT will be multiplied by 1.0E+07. When set to 3, the contact unload tolerance is multiplied by 1.0E+07.

• Changed the definition of PARAM, SLINEPROTOL. Previously this model parameter was designed to move a protruding contact surface onto the contact plane. This typically resulted in poor convergence and singularity errors so a zero value was recommended. Now, instead of moving the contact plane down, the datum is simply reset to zero. Doing this should minimize hot spots on curved contact surfaces.

• Changed the default for PARAM, SPARSEITERMETHOD for nonlinear analysis. Previously, the DIRECT method was forced for nonlinear analysis when no enforced displacements were specified. Now, the PCGLSS will select the either ITERATIVE or DIRECT based on model characteristics.

• Added the UPDATE option to the NLINDATABASE model parameter, which performs both a nonlinear database FETCH and STORE.

• Added support for nonlinear composite Progressive Ply Failure Analysis (PPFA) via the NLCOMPPLYFAIL model parameter. When set to ON, composite plies that fail the user specified failure theory will be reduced in material stiffness based on reduction scale factors specified on MAT1 and MAT8 Bulk Data entries. Support is provided for PPFA in nonlinear static and transient solution sequences.

• Added support for concrete materials in nonlinear solutions via the CONCRETE Bulk Data entry.

• Changed how PARAM, LGDISP is set in Automated Impact Analysis (AIA). The new behavior is that if PARAM, LGDISP is set to OFF or 0, it will be set to 1. All other settings will be retained.

• Enhanced surface contact grid point repositioning phase to now check if a repositioned grid will result in a singular element.

• Added subcase selectable contact via the CONTACTSET Case Control command. With this feature users can specify different contact regions and types for each subcase.

• Changed default for PARAM, SLINEOFFSETTOL to the MAXAD value specified on the CONTACTGEN Case Control command, if specified.

• Added an AUTO setting for PARAM, SLINEOFFSETTOL which is normalized to the model reference dimension. AUTO is not used when the CONTACTGEN Case Control command is specified in the model.

• Enhanced checking of MATS1 Bulk Data entry table data. A new check has been added when the TYPE field is set to NLELAST to check that the referenced table contains the origin.

Dynamic Analysis Enhancements

• Added PARAM, EIGENFLEXFREQ which specifies the threshold for defining the first flexible mode. Eigenvalues with a frequency greater than this value will be considered flexible modes.

• Added PCGLSS solver support for direct linear and nonlinear transient response analysis.

• Removed the license requirement for a DDAM Phase 2 analysis. When LICENSECODE is set to 01, a DDAM Phase 2 analysis can be performed without a license (dongle or network).

• Added direct enforced motion using the SPCD Bulk Data entry to all linear dynamic response solutions.

• Added an AUTO option to PARAM, RESVEC to enable residual vector generation for modal response solutions with direct enforced motion via the SPCD Bulk Data entry.

• Improved DDAM analysis performance for models where printed element results data was requested (PRINT specified on STRESS, STRAIN, GPSTRESS, or GPSTRAIN Case Control command). Announcing NEi Nastran V92

• Added scaled mode shape output for DDAM analysis via the TRSLDDAMDATA directive.

• Added support for models in metric units for DDAM analysis via PARAM, UNITS.

• Changed the TRSLLOADDATA directive when inertial relief is enabled to now translate load data after accelerations are applied.

• Enhanced DDAM tabular output by removing data for last mode in Modal Effective Weight and Peak Modal Response tables when the modal weight was less than 1%. Previously the data for this mode was included to show that modes including and past this mode had modal effective masses less than 1% and were excluded.

• Enhanced 3-Phase DDAM analysis by no longer requiring a DDAMDAT Bulk Data entry in the Model Input File when running the third phase.

• Added a new METHOD field to the DDAMDAT Bulk Data entry which allows either DDS-072 or NRL-1396 response spectra generation methods to be specified. Also, changed the default minimum G value to 1.0 for DDS-072.

• Added PARAM, ADDPSDAFREQ which when set to ON will add frequencies from TABRND1 entries referenced in the Case Control of a random response solution. Composite Analysis Enhancements

• Added an individual composite laminate ply interlaminar shear allowable in the SB field of MAT8 and MAT12 Bulk Data entries. The new SB field allows the specification of different bond material shear allowables from one ply to the next. This is especially useful for sandwich materials. Thermal Analysis Enhancements

• Added better support for thermal stress analysis in plane strain models. Previously the z-direction or through thickness stress generated when thermal loads were applied was ignored. Now the invariant stresses include the z-direction stress. Element Enhancements

• Enhanced hex element spurious mode control for non-parabolic hex elements with PARAM, HEXINODE set to OFF.

• Added PARAM, TETINODE which when set to ON will add an internal node to parabolic tet elements making them more accurate when highly distorted and in the areas where surface contact is present.

• Added support for plane strain elements in material nonlinear solutions.

• Added thermal expansion support for rigid elements (RBE2). When a coefficient of thermal expansion is specified on the RBE2 Bulk Data entry and the RIGIDELEM2ELAS model parameter is set to ON or AUTO a new rigid element will be used capable of rigid thermal expansion.

• Added a new large displacement/rotation rigid element (RBE2). When PARAM, LGDISP is set to ON or 1 and the RIGIDELEM2ELAS model parameter is set to ON or AUTO and the RIGIDELEMTYPE model parameter set to BAR, a new rigid element capable of large displacement/rotation will be used.

• Improved accuracy and robustness of offset welded contact when connecting shell elements to other shell or solid elements.

• Changed the default for the MID2 and MID3 fields on the PSHELL Bulk Data entry to MID1 when MID1 is a nonlinear material.

• Increased the integration order for parabolic hex elements that reference linear materials in nonlinear analysis. Announcing NEi Nastran V92

• Changed the behavior of HEXINODE when set to ON to now force an internal node when the hex element is parabolic in nonlinear analysis. Previously, parabolic hex elements in nonlinear analysis had the internal disabled. The internal node option increases accuracy when a coarse mesh is used.

• Added support for the UM field on RBE3 Bulk Data entries.

• Modified ASCG and AECG to skip element faces with surface contact already defined.

• Enhanced PARAM, AUTOFIXRIGIDSPC to now include slave degrees of freedom connected to other slaves. Results Enhancements

• Added PARAM, GPRSLTAVEMETHOD which specifies how shell element corner results are averaged to determine grid point values. When set to INVARIANT, all element corner result measures are calculated first and then averaged including invariant stress and strain. When set to DIRECT, only direct stress and strain is averaged and invariant results are determined from the averaged direct values.

• Added an Original Sequence column in the Real Eigenvalue output table when the MODESET Case Control command is specified. The Original Sequence lists the original mode numbers before the modal set is reduced.

• Added eigenvalue rigid body strain energy output.

• Added contact force and stress output to linear contact analysis. Other Enhancements

• Added MSC option to OPTIMIZESETTINGS directive to use initialization directive and model parameter and settings more compatible with MSC Nastran.

• Changed the logic when selecting the PCGLSS solver (DECOMPMETHOD = AUTO) to consider solver memory requirements or model size (DECOMPAUTOSIZE) versus requiring both conditions to be met.

• Enhanced network licensing by eliminating the delay between analysis start and license checkout. Previously licenses were checked out after model translation resulting in a significant delay depending on translation time.

• The Model Input File can now have a .BDF extension when specified on the Nastran command line. In this case the Translated Bulk Data File will default to a .DAT extension to avoid conflicts.

• Added the AUTO option for PARAM, KRIGIDELEM. The AUTO option will generate an appropriate KRIGIDELEM setting based on the largest Young's modulus specified in the model.

• Added PARAM, RIGIDELEMCORD which when set to ON or AUTO will allow rigid or interpolation elements or MPC equations which are linked to be in separate coordinate systems through internally generated collocated spring elements whose stiffness is specified by PARAM, KRIGIDELEM. The OFF setting provides the previous behavior which internally forces the dominant coordinate system at all connected points.

• Added the OUTSTRNSETID directive for specifying the setid for STRAIN Bulk Data entries exported with the TRSLSTRNDATA directive.

• Case is now preserved in Case Control TITLE, SUBTITLE, and LABEL commands. Lower case characters will not be automatically converted to upper case.

• Added support for the CLAN method on EIGC Bulk Data entries.

• Added an element id field to the CONTACTGENERATE Case Control command. Announcing NEi Nastran V92

• Added bolt preload via the BOLT and BOLTFOR Bulk Data entries and the BOLTLD Case Control command. Bolt preloads can also be specified directly on PBAR, PBARL, PBEAM, and PBEAML properties and CBAR and CBEAM element connection Bulk Data entries. Support is provided for all static, prestress, buckling and direct transient solutions. Editor Enhancements

• Editor Graphical User Interface now has a new look and feel.

• The Parameters/Directives tree on the left-hand side has been categorized into Basic and Advanced.

• Added support for the visualization of many entities including CDAMPi, CBUSH, CBUSH1D and CELASi.

• Dynamic plots are automatically generated during nonlinear analysis when the “Nonlinear Options/Generate Intermediate Results” and “Nonlinear Options/Load and Display Intermediate Results” options are checked. They have their own dynamics plots settings in the Default Settings dialog.

• Added Gravity load symbol when there is a GRAV card in the Bulk Data file (appears as a green symbol at the bottom right-hand corner of the model view.

• Added display symbol for enforced displacements.

• Max/min labels are set to transparent so the model can be seen behind the labels

NEi and the NEi logo are trademarks of NEi Software, Inc. NASTRAN is a registered trademark of NASA.

Copyright © NEi Software, Inc. 2008. All rights reserved. USA HEADQUARTERS NEi Software 5555 Garden Grove Blvd., Ste 300, Westminster, CA 92683-1886, USA Phone: 1.714.899.1220 Fax: 1.714.899.1369 E-mail: info@neisoftware.com Website: www.neinastran.com

EUROPE SmartCAE Piazza della Gualchierina, 9 59100 Prato, ITALY Phone: +39.0.574.404.642 Fax: +39.0.574.401.265 E-mail: info@smartcae.com Website: www.smartcae.com

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NEi Software Nastran Model Contest - Enter by December 1, 2008

2008-10-28T11:05:00.000-07:00

Got a Nastran model that you are proud of? Enter it into the 2008 NEi Software Finite Element Analysis Model Competition. Send us an image or model file of your part or structure for the chance to win an American Express gift card (250 USD), along with industry recognition for your talent and expertise. Entry will be judged by the NEi Software executive staff for analysis quality, innovation and depiction of NEi Nastran, Femap, NEi Fusion or NEi Works capabilities.

Submit one or more images or models (include your name and phone number) by 12/1/08 to contest@neisoftware.com or mail to NEi Software, 5555 Garden Grove Blvd, Suite 300, Westminster, CA 92683. Preferred format is high resolution jpg, tif or nas file. All photos & files submitted may be used for NEi Software promotions. The winner will be announced in our January NEi Newsletter.

Femap with NEi Nastran

2008-10-09T09:20:00.000-07:00

What is Femap?

FEMAP® by Siemens PLM Software is a professional level pre- and postprocessor used for preparing models and viewing the results of engineering analyses for structural, thermal, or fluid problems. Femap can import geometry from all major CAD systems and can use a wide variety of solvers including finite element analysis (FEA) and computation fluid dynamics (CFD). Femap runs on Microsoft Windows.

Why Femap?
Femap is a premier digital prototyping tool because of its extensive capabilities, high level of performance, and long term industry proven reputation in the following key areas of finite element modeling and post processing:
1. CAD Neutral. Imports all major CAD files with wide functionality for geometry clean up and feature suppression.
Solid Edge
SolidWorks
CATIA
Pro/Engineer
Autodesk
NX Unigraphics
I-deas

2. Solver Independent. Compatible with a full complement of highly regarded implicit and explicit FEA and CFD solvers including NEi, NX, and MSC Nastran, LS Dyna, Maya TMG-Flow and TMG Thermal, Abaqus, and ANSYS. Provides solutions to linear and nonlinear structural stress, deformation, modal analysis, thermal, heat transfer, impact, crash, fluid flow, multiphysics, aeroelasticity, optimization, and rotor dynamics engineering problems
Industry proven with an excellent reputation among knowledgeable FE analysts who have experience with a wide variety of CAE vendor software and tools

NEi, NX, MSC Nastran
TMG
LS-DYNA
ANSYS
ABAQUS
Sinda

Solver Independent

3. High quality, sophisticated meshing capabilities. Full control over the meshing process for all geometry types with the ability to work around deficient geometry. Example 1: Surface meshing API utility allows interactive mesh editing for surface tri meshing prior to solid tet meshing. Example 2: semi automatic hex meshing tools subdivide solid into meshable regions.
4. Range of Modeling Functionality -- Beams, Shells, Solids, Assemblies, and Composites.
Beams can be created directly as FE entities or meshed from curve geometry. Section properties calculated and fully displayed to easily identify orientation and offsets. Shells maintain accuracy and keep model size down for thin plate type structures. Mid plane extraction on geometry and shell meshing provides greater accuracy with smaller models than one element through a solid. Simulate assemblies and the interaction between members with easy automatic assembly detection, linear or nonlinear contact with or without friction, or glued contact, spot weld elements, and full access to manual connection definition. Easy contact visualization with selective transparency. Full support for composite materials with easy entry, view, organization, and manipulation of plies.
5. Real World Fidelity through Accurate Choice of Loads and Boundary Conditions
Apply loads and boundary conditions to geometry and the FE mesh, data mapping onto the structure from other sources, loads represented as functions.

6. Broad Range of Analysis Types and Engineering Disciplines
In addition to handling basic analysis types like linear statics, modal, buckling, and steady state heat transfer, Femap can support many advanced type solutions and analysis capabilities in various solvers.
Full Advanced Dynamics Capabilities
Dynamic analysis is a very important part of product verification. Femap can perform transient response, frequency response, random analysis, response spectra generation and analysis, complex modes, Dynamic Design Analysis Method (DDAM). Plus includes full modeling functionality with mass and damping elements, loading functions, and post processing of results.
Advanced Nonlinear Capabilities.
Model large deflections, nonlinear material properties, contact, impact or crash with implicit and explicit types of analysis.
Advanced Thermal Capabilities
Conduction, convection, and radiation with steady state and transient heat transfer analysis. Thermal couplings and boundary conditions, convection correlation, temperature mapping and duct flow.
Fluid Flow Capabilities
Analyze fluid flow as well as fluid cooling effects in thermal analysis and fluid-structure interaction. Fans, vents, flow surfaces and high speed flow.
Rotor Dynamics Capabilities
Determine dynamic behavior of parts that rotate at high speeds.
7. Full Complement of Post Processing and Visualization Tools
Allows complete, in-depth exploration of results including free body diagrams, beam diagrams, data tables, graphs, contour plots, and animations.
8. Customization and automation of simulation tasks.
9. Ease of Use.
Windows native with a flexible analysis process. The user is not forced into a strict series of actions. Work through the menu, model information tree or both.
10. Best Price for Functionality.

Who Uses Femap?
Femap is for product design and development professionals who need to do more effective analysis and have moved beyond the capabilities found in typical in-CAD simulation software or more limited FEA products. They need a CAE tool that provides them with more functionality, more control over they analysis process, and provides more accurate results. They have moved from simple parts to assemblies and more complex systems. They have moved from being primarily involved in CAD design with occasional need for validation to more involvement with engineering and analysis. They have climbed the FEA learning curve and are ready for the next level of analysis.

Femap with NEi Nastran
Integrating tightly with NEi Nastran, this combination provides significant additional functionality for Nastran users. This includes advanced capabilities for composites engineering and analysis with tools for advanced failure criteria for first ply failure like Puck and LARC02 and Progressive Ply Failure Analysis (PPFA™) for simulation of behavior beyond first ply failure. Automated Impact Analysis (AIA™) provides sophisticated simulation for drop tests and implicit impact studies. Productivity tools like Automated Surface Contact Generation (ASCG™) and Automated Edge Contact Generation (AECG™) help in industries with models having large shell like structures as found in ship building and automotive. See 16 Things that NEi Nastran has that Other Nastrans Do Not for a full itemization of distinctive features.

For more information on Femap with NEi Nastran, visit NEi Software or email info@neisoftware.com

Noran Engineering is now NEi Software

2008-08-25T16:46:00.000-07:00

Because of your close association with the company, we wanted to inform you directly of the change to our company name. The change was driven by the need to clearly communicate to many new users in our rapidly growing technical and business audience that our focus and primary business is software -- development, marketing, sales, training, and support of Nastran based engineering analysis, simulation, and virtual test software.
This is a very exciting time for us. You will be seeing press releases and news items in the next couple of days announcing the new company name. The following link will take you to the press release that is being issued along with the new company logo that accompanies the name change.

http://www.nenastran.com/newnoran/pressReleaseImage

To those of you who have a long familiarity with the Noran Engineering name, we know you will see the change as another sign of the continuing growth and success we are having. More and more engineers and managers are recognizing that NEi's constant innovation and commitment to responsive support translates directly to benefits for their analysis capabilities, a better product development process, and an improvement to their company's competitive position. We thank you for your support and look forward to working with you as NEi Software.