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The base version of iSTRDYN is available by download on a time-limited trial basis.

iSTRDYN Features:

iSTRDYN is a revolutionary computer code for the design and analysis of rotor-bearing systems.  Key features of the program can be listed as follows:

  • CAD file import - define geometry (points and lines) from practically any 2D CAD cross section, and even programs like Visio!
  • 2D axisymmetric harmonic finite elements - provides a near exact representation of rotor/structure geometry, and includes radial, axial, and tangential motion for nearly 3D resolution.
  • Bladed elements - represent airfoils, holes, balance rings, etc.  Thickness can be specified using a 2D table or on individual nodes.
  • XML import/export - materials, lubricants, and even complete models can be imported and exported with XML files.
  • Mesh generation - create nodes and elements from points and lines, specifying divisions and biases.  Automatic meshing is available.
  • Profile optimization - any node numbering scheme acceptable as internal numbers automatically reordered at run time to reduce analysis profile.
  • Unlimited problem size - all memory is dynamically allocated so there is no practical limit to how big a model can be.
  • Graphical selection - choosing nodes and elements for application of supports or loads can be done by selection on geometry model.
  • Comprehensive output - all graphical displays and listings can be saved or printed.  Even animated deflections can be written to AVI files.
  • Unit systems - 3 unit systems are supported explicitly - English, SI-meters and SI-millimeters.  All input and output quantities that have units are clearly specified and can be switched between the various systems as desired.  No more consistent unit ambiguity!
  • Complete rotor dynamics:
    • Damped natural frequencies
    • Steady (speed-dependent) response
    • Transient (time-dependent) response
  • Linear heat transfer:
    • Conduction
    • Convection
    • Heat generation
    • Specified nodal temperatures
    • Steady or transient (linked directly to rotor dynamics)
  • Elastostatic stresses:
    • Body forces (rotation, maneuver, and thermal)
    • Modal and forced response (steady and transient)
  • Element and nodal loads:
    • Eccentricity (unbalance, in terms of radial and angular offset)
    • Radial, axial, and tangential nodal forces (frequency & speed dependent)
  • Embedded bearing mechanics:
    • Rolling elements (ball and cylindrical roller), including friction and heat generation
    • Journal (plain and arbitrary geometry), squeeze film, tilt pad, and hydrostatic fluid films with no assumed loads
  • Linear and non-linear supports:
    • Speed-dependent linear (stiffness, damping, and mass coefficients)
    • Piecewise non-linear (force-displacement in radial & axial directions)
    • Frequency response functions
    • Constraints
  • Output Sets - used to organize different runs with a common model into logical output groups, such as different speed/time increments, parameter variations, or loading changes.  View the results separately or combined.
  • Edit functions - copy, paste, undo, and redo, including modeling operations.
  • Expert system - provides input validation, checks for model completeness, provides graphical interface for building and running a model, and will ultimately review results.
  • Help system - both general and context specific

For illustrations of these features, please go to the examples page.  However, the true capabilities of iSTRDYN are best experienced first hand.  Why not download a trial version and see for yourself how it will dramatically improve the design and analysis of your rotating machinery?