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Developing Improved Civil Aircraft Arresting Systems (2009) / Chapter Skim
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Pages 137-143

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From page 137...
... 12.3.2. Tire and Arrestor Simulations As with the glass foam material evaluation, the arrestor models were constructed in LS-DYNA using the deformable FEM tire models and SPH arrestor beds (Figure 12-4)
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From page 138...
... 12.3.2.1. Arrestor Bed Models The arrestor bed models were constructed using halfsymmetry to reduce computation time.
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From page 139...
... Aircraft Landing Gear Tire Designation Included in Evaluation Main Gear H29x9.0-15 Included CRJ-200 Nose Gear R18x4.4 - Main Gear H44.5x16.5-21 Included B737-800 Nose Gear H27x7.7-15 - Main Gear H49x19-22 - B747-400 Nose Gear H49x19-22 - Table 12-1. FEM tire library for glass foam arrestor models.
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From page 140...
... Metamodel Method The output from the batch simulations was extracted and assembled automatically by LS-OPT, where metamodels were constructed for the drag and vertical load forces. Metamodeling is analogous to fitting a curve through experimental data except that it is applied to multi-dimensional data sets.
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From page 141...
... reflected similar trends. The right hand image of Figure 12-8 shows an interesting behavior: for the linear gradient material, the response becomes insensitive to the arrestor bed depth, becoming essentially flat in the depth-wise direction.
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From page 142...
... 12.4.6. Summary of Metamodel Analysis The metamodel analysis explored linear, quadratic, and exponential depth-varying material profiles using stratified arrestor bed models.
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From page 143...
... In practice, this methodology could be readily implemented using a glass foam block material, with minimal impact on anticipated cost, construction methods, or maintenance needs. Finally, Chapter 11 demonstrated that the exponentially depth-varying aggregate foam material could achieve performance leveling between aircraft.
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Key Terms

  • aggregate foam
  • glass foam
  • arrestor models
  • anticipated cost
  • emas arrestor

  • batch simulations
  • material model
  • arrestor bed
  • foam material
  • bed model

  • exit speed
  • foam arrestor
  • bed models
  • penetration depth
  • design exit

  • candidate arrestor
  • landing gear
  • batch simulation
  • rigid plane
  • prescribed vertical

  • simulation times
  • drag load
  • main gear
  • tire models
  • nose gear

  • arrestor candidate
  • arrestor model
  • similar trend


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