Structural Dynamics

This section lists some of our capabilities under the general heading of “Structural Dynamics”. Our structural dynamic expertise includes:

• Component finite element model (FEM) reductions to dynamic math model (DMM):
  • Fixed-interface (Hurty/Craig-Bampton)
  • Free-interface (Rubin, Rubin-MacNeal)
  • Mixed-interface (Majed-Henkel: ASD developed/default in NASTRAN)
  • Modal
  • Interface stiffness/mass loaded(Benfield-Hruda)
• Component DMM output transformation matrix (OTM) generation:
  • Mode-acceleration method
• Component-modal synthesis (CMS):
  • Analytical integration of component DMMs/OTMs
  • Includes CMS of component damping matrices
• FEM and DMM checks:
  • Multi-level stiffness, damping, and mass balance checks, mass properties, 1G checks, effective modal mass, frequencies, and rigid body OTM checks
• Transient dynamic analysis
• Nonlinear transient dynamic analysis
  • Includes the impact of friction, deadbands, snubbers, bumpers, multi-linear springs (straps, foam, ...), contact/re-contact, isolation, nonlinear dampers, ...
• Frequency-domain analysis
• Random vibration analysis
• Shock-response spectra analysis
• Base-drive analysis:
  • Time-domain
  • Frequency-domain
  • Random vibration analysis
• Multi-body, large angle, analyses:
  • Mechanisms
  • Flexible body simulations
• Rotordynamic analyses:
  • Lateral analysis including gyroscopic, gravity, shaft bow, hydrodynamic bearings, bearing damping/stiffness, fluid-structure interaction, ...
  • Torsional analysis including transient start-up, shut-down, short-circuit, mal-synchronization, ...
• Aeroelastic analysis:
  • Static aeroelastic response
  • Flutter
• Monte Carlo and structural parametric variational analyses