NISA Software

A trusted FEA tool with flexible purchase options.

Learn More

Case Studies

View an array of industry related NISA Case Studies

Case Studies

NISA Support

Find out more about NISA support or request support.


Proven Finite Element Tools for Geomagic Design - A full-featured, simulation solution for linear static and eigenvalue analysis.

PreSys and NISA, advanced finite element analysis tools, are now combined for use by Alibre users.  This full-featured package allows users to automatically convert Alibre CAD data into finite element models, define material and loading constraints and perform a design simulation.  This type of analysis allows engineers to identify potential problems and improve product designs, reducing product development time and cost, while improving performance.
PreSys, a Pre/Post-Processor with a strong heritage, allows the user to create even the most complex finite element models easily. It is a full-featured, core solution that can be used on its own or with a variety of available add-on applications. The system offers advanced automeshing tools to provide the highest quality mesh with little CAD data preparation on imported or created geometries.  All required analysis data can be created via intuitive forms.
The solver engine, NISA is one of the most comprehensive engineering analysis suites available and has been an engineer’s favorite for more than 40 years.  It is capable of extremely accurate linear static and eigenvalue analyses.


  • An Intuitive, Customizable GUI
  • High Performance Graphics
  • A Scripting Interface
  • A Tree Structure Layout for Model Data
  • Easy Import/Export of Geomagic Design Data
  • Complete Post Processing of Simulation Results

Linear Static Analysis

Static Analysis Features:
  • Selection of Efficient Solvers
  • Buckling Analysis
  • Interia Relief
  • Rigid Links & MPC
  • Interlaminar Shear & Edge Effects for Composite Elements
  • Multiple Load Cases
Material Properties
  • Isotropic or Orthotropic, Temperature Dependent
  • Layer & Sandwich Composite Material 
  • Various Composite Failure Criteria
Boundary Conditions
  • Specified Nodal Displacement (Zero/Non-zero; Translation or Rotation)
  • Coupled Displacement; Multipoint Constraints
  • Concentrated Force, Moment, Pressure Load, Thermal Load
  • Gravity, Linear/Angular Acceleration
  • Moving Load
Printed & Graphical Output
  • Displacements, Stresses & Strains at Elements & Nodes
  • Principle Stresses & Their Directions
  • Von Mises, Maximum Shear & Octahedral Shear Stresses
  • Averaged & Unaveraged Nodal Stresses, Element Stresses at Gauss Points & Centroid
  • Buckling Load Forms & Mode Shapes


Linear Dynamic Analysis

Eigenvalue Analysis
  • Natural Frequencies, Mode Shapes
  • Modal Stresses & Strain Energy
  • Multiple Eigenvalue Extraction Algorithms
  • Extraction of Zero Frequencies (Rigid Body Modes) & Coincident Frequencies
Modal Dynamic Analysis
  • Viscous, Structural, Proportional & Material Damping
  • Capabilities to Handle Rigid Body Modes
  • Transient Dynamic Analysis
    • Time Dependent Ground Excitations,  Nodal Forces & Pressure Loading
    • Nonzero Initial Displacements
    • Time History & Snapshot Output for Results
    • Generation of Floor Response Spectra
  • Frequency Response Analysis
    • Frequency Dependent Harmonic Ground Excitation, Nodal Force & Pressure Loading
    • Point-to-point Transfer Function Calculation
  • Random Vibration Analysis
    • Stationary & Non-stationary Input
    • Auto PSD & Complex Cross PSD Input
    • Numerical or Exact Integration of the PSDs to Compute the Covariance Matrices
    • PSD & RMS Response Output
  • Shock (Response) Spectrum Analysis (Seismic)
    • Multi-directional Displacement, Velocity or Acceleration Spectra Input
    • Modal Combination Rules
    • Absolute Sum
    • Square Root of Sum of Square or RMS Sum
    • Peak RMS or NRL Sum
    • Complete Quadratic Combination (CQC) Sum
    • Automated Mode Selection & Spectra Computation by U.S. Navy DDAM Method
    • Missing Mass Correction


Diffusor simulation image PreSys™ Environment for NISA Users
The user-friendly PreSys™ environment, developed by sister company Engineering Technology Associates, Inc. (ETA), is now available to NISA users world-wide.

This offering will allow NISA users to take advantage of PreSys’s streamlined user interface, CAD interoperability and advanced graphics capabilities; thereby improving the overall NISA user experience.

Finite Element Modeling and Analysis Software
An integrated Pre/Post-Processor with a strong heritage, PreSys is a computer aided engineering (CAE) modeling software that will allow you to create even complex finite element models easily. It is a full-featured, core mechanical engineering software solution that can be used on its own or with a variety of available add-on applications.

It also offers a scripting interface to automate processes and interact with 3rd party solutions, as well as a model explorer feature to provide in-depth data navigation.

ship simulation imageRefreshed User Interface, Increased Graphics Speed
When the user opens PreSys for the first time, they will immediately notice the refreshed user interface, with drop-down menus and toolbars.  They also quickly notice the graphics speed and added graphics capabilities of PreSys.  The user interface also allows user to quickly find the tools they need, has fewer levels of menus and is easier to learn.

Fewer Steps & Streamlined Functions
Developers focused not only on packaging the existing tools into the new user interface, but took the opportunity to streamline as many functions as possible. This means that fewer operation steps will be required, and that the users will have a minimum amount of data to enter.  The result is a faster path to your FE analysis.

Model Explorer
A significant change in the software is the addition of the Model Explorer. This essentially adds another dimension to the information available to the user at all times. The Model Explorer allows the user to manipulate all of the entities in the model, and also allows users to access non-graphical data through a Keyword tree. The Keyword tree allows access to editable card images for virtually any entity in the model.

Multiple Models and Integrated Pre & Post
As the needs of the CAE engineer expand, the software tools must expand along with them. Inventium’s products allow users to open and operate on multiple models, as well as opening finite element analysis (fea) simulation results files along with finite element data. This feature provides a unique way for users to get the most out of their software and increase productivity.

Open Architecture / Scripting Access
The Inventium architecture allows the user to capture the process, replay and modify it. This process capture is based on a fundamental capability of the software to execute any function through a scripting interface.

To be truly open and accessible for outside software tools and configurable for processes, each function within the software must be accessible through scripting access. Passing variables or data between software products provides the foundation for parametric design optimization, where the FE modelling software reacts to the results or direction dictated from external software, and automatically updates the model. In this case the design may be ‘driven’ by outside software.

This type of capability, combined with powerful, robust and accurate modelling functions promises to change the way that engineers develop products, and will unlock the potential of optimization software for the use in everyday problems.

Download Brochure    Download PreSys for NISA

cadtranslators2To facilitate the integration of analysis with CAD, NISA Software, Inc. offers a slew of data exchange capabilities. They take one of the two forms: (1) direct CAD system interfaces, implemented by a menu command within a CAD program, and (2) indirect data exchange interfaces, provided by various data translators or built-in commands of DISPLAY III/IV. Data conversion takes place in a manner transparent to the user.

Download Brochurecadtranslators1

governorDYMES is a general purpose program for static, kinematic and dynamic analyses of constrained multibody mechanical systems undergoing large, nonlinear, three-dimensional displacements. DYMES/CONTROL has been integrated with DYMES for controlled mechanical system simulations.


  • Well organized free-format input with excellent readability and flexibility for modification
  • Integrated with DISPLAY III/IV for model creation and graphical results interpretation
  • Enhanced graphics with animation in the post-processor for easy visualization of highly nonlinear motion of complicated mechanisms
  • Sophisticated full vehicle or suspension system modeling
  • Large library of standard and composite joints for modeling mechanical systems
  • Many sophisticated force elements to stimulate cables, springs, dampers, actuators, beams, bushings, etc.
  • DYMES/CONTROL for controlled mechanical system simulation


  • Assembly analysis
  • Redundancy analysis
  • Static equilibrium analysis
  • Quasi-static equilibrium analysis
  • Dynamic analysis
  • Kinematic analysis
  • Inverse dynamic analysis


  • Single-Input, Single-Output (SISO) and Multiple-Input, Multiple-Output (MIMO) control system modeling
  • Actuation of mechanical system according to controller commands
  • Feedback of variables from mechanical system to control system
  • Transfer function matrix generation
  • Vector import and export of control blocks
  • Accessibility of all node and state variables
  • Parameter variation study
  • Pure control system simulation


Download Brochure

NISA Login