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Developing Improved Civil Aircraft Arresting Systems (2009) / Chapter Skim
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Appendix G - Arrestor Prediction Code
Pages 188-194

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From page 188...
... Concept Description At the core of APC is an aircraft suspension model that calculates the dynamic loads and motion of an aircraft as it rolls through an arrestor bed. The arrestor bed exerts loads on both the nose and main gear, and the aircraft responds by pitching forward, bouncing, sinking into the bed, and decelerating to an eventual stop.
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From page 189...
... (MATLAB) Metamodel Data Performance Predictions Tire LoadDeflection Data Aircraft Library Arrestor Design Definition x z Direction of Travel FV,MG FD,MG FD,NG FV,NG Main Gear Wheel/Axle Fuselage Nose Gear Wheel/Axle Strut Strut Tire/Arrestor Interface Tire/Arrestor Interface Wing Mass Main Gear Rut Nose Gear Rut u1u2 u3 u4 u5 u6 x θ (2)
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From page 190...
... G.4.1. Published Manufacturer Data Published aircraft data generally included information regarding aircraft weight, gross dimensions, landing gear strut configurations, and the types of tires used.
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From page 191...
... Sources found during the literature review provided the means to calculate approximate values. Chester outlines a modeling approach for a generalized aircraft of arbitrary size, with a focus on landing gear dynamics and overall airframe response (16)
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From page 192...
... to nose and main gear Overall Aircraft Dimensions Height to CG Published data Supplemented using generalized model Number of struts Wheels per strut Configuration Number of shadowed wheels Published data Mass Travelling weight Generalized model Stiffness Strut Damping Generalized model Diameter Static deflection Static load Maximum deflection Tire Maximum load Published data Drag limit load Main & Nose Gear Load limits Drag ultimate load FAR Part 25 Mass Weight Stiffness Wings Spring properties Damping Not used
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From page 193...
... Metamodel variables and responses. FV FD Main Gear Wheel/Axle Strv Tire/Arrestor Interface RutArrestor Bed x z Direction of Travel Wheel/Tire Mass Variables Responses Included in Metamodels Forward speed Bed depth Penetration depth of tire Vertical load Drag load Neglected in Metamodels Vertical speed Spin rate Braking torque Torque on tire
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From page 194...
... Integrate Over Time Step & Calculate Displacements Output Data & Plot Files Simulation Complete Figure G-4. Simplified process diagram for the arrestor prediction code.
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Key Terms

  • arrestor bed
  • metamodel data
  • landing gear
  • main gear
  • published data

  • arrestor code
  • arrestor material
  • drag load
  • bed depth
  • drag loads

  • vertical speed
  • crushable foam
  • numerical model
  • nose gear
  • load limits

  • arrestor design
  • aircraft model
  • generalized aircraft
  • aircraft arrestor
  • arrestor beds

  • arrestor prediction
  • vertical load
  • vertical loads
  • gear rut
  • generalized model

  • pitching moment
  • dynamics transformed
  • aircraft library
  • dynamic loads
  • radial spring


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