Specific to ejections of humans from aircraft…

SECorp has several multi-body dynamics models which predict the full trajectory (acceleration, velocity, displacement, and loads) of an aircraft ejection system. (All models are currently in use by the USAF and USN, and maintained by SECorp)

  • Models are variable in analysis speed and fidelity (Excel 4-DOF for rapid simulations, AEPS-II for rapid high fidelity simulations, and AEPS-III for full fidelity simulations with an articulated 6-DOF occupant; “SAM” – the SECorp Articulated Manikin)
  • All models are “parametric” (written with a suite of design variables that allow representation of virtually any ejection system, on any aircraft, in any flight condition). These User controls also allow studies of discrepancies from nominal performance.
  • Each model includes a User-expandable library of scenarios (historical combinations of a particular occupant, ejection seat function, aircraft, and flight condition).

EjectSim (Excel-Based 4-DOF)

  • EjectSim works on any common computer (with modern Excel), and performs numerous User-driven automated design studies, while adapting to virtually any seat system.
  • Full aircraft initial state vector (height, speed, AOA, roll, etc.),
  • Seat egress is calculated in 4 Degrees of Freedom (resolving height, range, cross-range, and pitch vectors)
  • Variable occupant mass and aerodynamic properties
  • Variable seat/system designs (AEPS-II, AEPS-5, ESCAPAC, MkXX, etc.)
  • Multiple bodies tracked (aircraft, canopy, seat, parachute extractor, recovered crew, etc.)
  • Multiple seat-stabilizer systems (drogue chutes, STAPAC, DART, etc.)

AEPS-II (ADAMS-Based 6-DOF)

  • AEPS-II operates only in ADAMS software (the current leading professional 6-DOF multi-body dynamics software), and includes…
  • Complex aircraft state vectors and flight controls during ejection simulation, including ground-to-wing contact, landing gear, cable arrest, etc. – with moving carrier platforms
  • Complex seat-to-rail structural interaction with 6 mechanical contacts (“rollers” or “slippers”), with friction and clearance effects
  • Complex phases of canopy jettison, seat catapult, rocket phases and seat stabilization, body emergence into airstream, deployment of main chute extraction system, etc.
  • Fully parametric (with over 200 User-controlled design variables that can represent virtually any ejection system, on any aircraft, in any flight scenario)
  • Occupant is a simplified, semi-rigid manikin (with multiple variables adjusting occupant mass, center of mass, aerodynamics, etc.)

AEPS-III (all features of AEPS-II, plus an articulated 6-DOF manikin “SAM” as the instrumented seat occupant)

For further review… see several demonstrations, below, on YouTube…

For further information on ejection systems, ejection system modeling, or pricing… please contact SECorp

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