In recent years, John O'Callahan has been actively involved in research in the MACL mainly in the areas of

• Development of model reduction schemes such as
  • Improved Reduction System (IRS)
  • Dynamic Condensation
  • System Equivalent Reduction Expansion (SEREP)
• Development of vector expansion techniques such as
  • Dynamic expansion
  • Guyan and IRS expansion
  • SEREP and SEREPa expansion
• Development of improved models based on measured modal data such as
  • Analytical Model Improvement - AMI
  • Stiffness Skyline Optimization - SSO
  • Mass and Stiffness Skyline Optimization - MSSO
  
  

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