THE EFFECT OF AIRDROP IMPACT ON COMPLEX STRUCTURES

Abstract

The accelerations and displacements in a complex structure subjected to an impact loading are computed by treating the structure as a lumped parameter system. A mathematical model of the system consists basically of discrete masses linked by weightless, elastic beams with the appropriate stiffnesses, areas, and moment of inertia properties. By specifying a proper set of independent coordinates through which the motion of these lumped masses are uniquely described, and by writing equations of motion in terms of these coordinates, a set of equations is derived which represents the motion of any part of the model during impact. Using the Runge-Kutta numerical method, and a digital computer, these equations are solved. A physical model of the lumped parameter system was built and cusioned with paper honeycomb. Displacements and accelerations at some points in this model were measured and compared with computed results. Agreement is satisfactory.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1969
Accession Number
AD0711555

Entities

People

  • E. A. Ripperger
  • Song Fong Jan

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Engineered Resilient Systems

DTIC Thesaurus Topics

  • Computer Programs
  • Computers
  • Differential Equations
  • Digital Computers
  • Displacement
  • Equations
  • Equations Of Motion
  • Frequency
  • Inertia
  • Mass
  • Mathematical Models
  • Measurement
  • Mechanics
  • Models
  • Moment Of Inertia
  • Runge Kutta Method
  • Stiffness

Fields of Study

  • Physics

Readers

  • Structural Dynamics.
  • Systems Analysis and Design