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Evaluation of the Effect of Pack Shape on Parachute Packing Density

机译:包装形状对降落伞包装密度影响的评估

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The optimum shape of a parachute pack where high pack density is required with no packing-induced damage incurred has long been held to be a right circular cylinder. The pack density possible for any other pack shape is typically lower due to the volume in corners that cannot be packed to the same density. The question frequently arises as to what the maximum pack density would be for a given shape, but to date there has not been a good way to predict it. Evaluations conducted in 1961 for the Apollo program were limited to the pack density attained for two nylon parachute types packed in a right circular cylinder at varying levels of pressure. This data is useful in determining the effect of additional pressure on pack density, but does not include other pack shapes or modern, high-tenacity materials. An investigation was conducted to determine the effect of other pack shapes on parachute packing density. The intent of this effort was to generate a predictive tool to determine a density reduction factor based on pack shape, which will be invaluable for future program planning purposes. Testing consisted of packing a common parachute into various shapes to determine the relationship between the geometric properties of the pack shape and the density of the packed parachute, as a function of packing pressure. This paper describes the tests performed and documents the results of this investigation.
机译:要求高包装密度而又不会引起包装引起的损坏的降落伞包装的最佳形状长期以来一直被认为是正确的圆柱体。由于无法包装成相同密度的边角处的体积,其他任何包装形状可能的包装密度通常都较低。关于给定形状的最大包装密度将经常出现问题,但是迄今为止,尚没有一种很好的方法来对其进行预测。 1961年对Apollo计划进行的评估仅限于在不同压力水平下将两种尼龙降落伞类型装在一个直圆柱中时所达到的装填密度。该数据可用于确定附加压力对包装密度的影响,但不包括其他包装形状或现代的高强度材料。进行了调查以确定其他包装形状对降落伞包装密度的影响。这项工作的目的是生成一个预测工具,以根据包装形状确定密度降低因子,这对于将来的程序规划目的将是无价的。测试包括将普通降落伞包装成各种形状,以确定包装形状的几何特性与包装降落伞的密度之间的关系,该关系是包装压力的函数。本文介绍了执行的测试并记录了调查的结果。

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