Pneumatic protection applied to an airbag for para-gliders
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Revised: 19 November 1997
Accepted: 19 November 1997
Published online: 15 February 1998
We present a theory of pneumatic protection based on the laws of thermodynamics, elasticity and fluid mechanics. A general pneumatic protection system is made up of several communicating compartments, the differences in pressure of the compartments generating a transfer of mass and energy between them. The transfer offers interesting possibilities to improve the performance of the system. An example of this type of protection in aerial sport is the airbag for para-gliders, it is used in this paper to illustrate the theory. As the pressure in the airbag depends uniquely on its volume, the geometric model in the theory can be simplified. Experiments carried out with crash-test dummies equipped with sensors have confirmed the theoretical predictions.
PACS: 89.20.+a – Industrial and technological research and development / 44.60.+k – Thermodynamic processes (phenomenology, experimental techniques) / 47.27.-i – Turbulent flows, convection and heat transfer
© EDP Sciences, 1998