INVESTIGATIONS ON THE DYNAMIC STABILITY OF PERSONNEL GUIDE SURFACE PARACHUTES

Abstract

In order to investigate the dynamic stability of a parachute the system of the non-linear equations of motion is derived. In contrast to previous contributions this system of differential equations is non linearized, but is integrated by means of electronic computers for a number of examples of personnel guide surface parachutes. The influence of the suspension line length, the effective porosity of the canopy, the weight of the load and the apparent mass on the dynamic behaviour are studied for the examples chosen. The results show that the oscillations of parachutes cannot be described by linearized equations of motion. For instance, only the nonlinear procedure enables the complete description of the velocity oscillations. Furthermore, it becomes evident that frequency and damping depend on amplitude. For some amplitudes the square of the oscillation period is proportional to the length of the suspension lines. With increasing porosity of the canopy the damping increases and the oscillation period decreases.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1963
Accession Number
AD0436670

Entities

People

  • R. Ludwig
  • W. Heins

Organizations

  • AGARD

Tags

Communities of Interest

  • Human Systems
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Forces
  • Aeronautical Engineering
  • Air Masses
  • Analog Computers
  • Computers
  • Differential Equations
  • Equations
  • Equations Of Motion
  • Government Procurement
  • Governments
  • International Relations
  • Measurement
  • National Security
  • Nato
  • Parachutes
  • Trajectories
  • United States

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Aerodynamics/Aeronautics.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems