THEORY OF HIGH-SPEED-IMPACT ATTENUATION BY GAS BAGS
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC
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A theory is developed for the one-dimensional motion of a cylindrical gas bag used as an impact cushion. The effect of shock waves in the gas as well as stress in the bag skin is considered. The applicability of the theory to landings both in an atmosphere and on the moon is discussed and the regime of validity of the theory is presented. The use of a series expansion for computing shock-wave properties in the analysis, the strong shock approximation, and the exact shock relations are compared and discussed. The regime of physical parameters for which both the wave model and the series expansion are valid is presented. The method of application of the theory to impact problems is outlined.
- Safety Engineering