Abstract
A computer model of a parachute system based upon a six-degree-of-freedom analysis is described. Its current limitations are discussed and an outline of the analysis and computer program is given. This is followed by a brief description of some comparisons made with real drops and the input data currently considered necessary to simulate the behavior of a real parachute. The paper concludes with a look at possible investigations which could lead to improvements to the model. The program is capable of ready adaptation to cope with a parachute system symmetrical about a plane through its longitudinal axis. The main assumptions are: the payload is rigidly connected; the aerodynamic forces on both canopy and payload aie determined solely by the instantaneous angle of attack of the oncoming airstream; the apparent and included inertias of the system are constants, but are dependent upon the direction of the acceleration. A feature of the model, in addition to those just outlined, is an ability to simulate parachute behavior in a turbulent wind.
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