Air Cushion Landing System Stability Study.

Abstract

An analysis of an inelastic ACLS plunge mode dynamic model is presented. The ACLS has unrestrained side elements and frozen end elements. The model exhibits unstable behavior at certain operating conditions for which the side elements are in contact with the ground. A linear analysis showed this instability to be due mainly to the altitude sensitivities of the cushion to atmosphere airflows and the attendant influence on the dynamic pressure forces on the vehicle. The model instability can be alleviated by isolating side and end elements so that they are all unrestrained and by simultaneously venting the air cushion directly to atmosphere. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1981
Accession Number
ADA097744

Entities

People

  • Thomas D. Burton

Organizations

  • Washington State University

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Flow
  • Aircrafts
  • Altitude
  • Atmospheres
  • Differential Equations
  • Equations
  • Flow Rate
  • Frequency
  • Geometry
  • Instability
  • Phase Shift
  • Resonant Frequency
  • Sensitivity
  • Shape
  • Two Dimensional
  • Vehicle Equipment
  • Vehicles

Readers

  • Aerodynamics/Aeronautics.
  • Structural Dynamics.