NESSUS 9.5 Release Notes

June 9 2010

 

NESSUS 9, 9.1, and 9.5 bring many new enhancements. With NESSUS 9.5, the graphical interface has been reworked to greatly simplify the process of setting up and solving a problem. The following list provides an overview of the highlights in these releases.

New Capabilities and Enhancements

New in Version 9.5

  • Simplified outline layout
    • Problem Definition node begins with problem statement definition instead of system definition (now Fault Tree Definition)
    • Fault Tree, Correlations, and Confidence Bounds are now accessed via popup windows instead of separate outline nodes
    • Consolidated "Deterministic Analysis" and "Parameter Variations Analysis"
    • Consolidated probabilistic analysis type and method configurations
    • Simplified procedure for running analyses and viewing results
  • Improved interfaces for generating finite difference step sizes and deterministic input values (parameter variations)
  • Inverse reliability analysis support for RSMGP
  • Additional advanced options for EGRA
  • Fix for triangular distribution

New in Version 9.1

  • Improved distribution editing interface
    • PDF equations displayed in the GUI
    • Short descriptions of distribution parameters in GUI
  • Support for MacOS X
  • Miscellaneous minor bug fixes

New in Version 9

  • New Reliability Analysis Methods
    • ISMPP: Importance sampling at user-defined MPP
    • EGRA: State-of-the-art surrogate-based method designed for extremely expensive response functions. Unlike MPP-based methods, it is not gradient-based
    • RSMGP: Gaussian process surrogate method
  • LHS enhancements (advanced options)
    • Optimal design based on max-min distance criterion
    • 3 correlation reduction methods for small samples
    • Capability to augment (double) sample size while maintaining Latin Hypercube structure
  • Probability distribution modeling
    • New distributions: beta, exponential GEVmax, GEVmin, gamma, Pareto, triangular, uniform
    • Capability to switch between definition in terms of natural parameters or mean & standard deviation

Operating Systems

  • Windows (XP, Vista, 7)
  • Linux
  • Mac OS X