An Estimate of the Effect of MER (Multiple Ejection Racks) Structural Dynamics on Store Separation

Abstract

Structural flexibility has long been suspected as being a factor affecting the ejection phase dynamic response of stores. After hook opening, in-carriage loads, associated with a released store, and an ejection recoil force deflect the MER beam away from its initial position. This in turn leads to a lower ejection velocity, lower ejection pitch rate, and an induced rolling moment. A theoretical structural dynamic model is based upon 'Bernoulli' pitch and yaw deflections and torsional rotation of the MER beam; wing, pylon, hanger, shoulder pad, and ejector unit deformations are neglected. Detailed development for the present report is confined to the pitch plane bending and store pitch dynamics case. For small pitch angles a linear set of kinematic and dynamic equations for the store ejection phase is obtained. Sample computations are given for two stores and constant aircraft pull-up rates.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1974
Accession Number
AD0779274

Entities

People

  • Leroy Devan

Organizations

  • Naval Surface Warfare Center Dahlgren Division

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Altitude
  • Aluminum Alloys
  • Bombs
  • Carriages
  • Coefficients
  • Computations
  • Coordinate Systems
  • Dynamic Response
  • Eigenvalues
  • Equations
  • Frequency
  • Geometry
  • Lepidoptera
  • Mach Number
  • Resonant Frequency
  • Rotation

Readers

  • Aerodynamics/Aeronautics.
  • Control Systems Engineering.
  • Structural Dynamics.