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Foam materials for impact absorption
 Pilát, Adam ; Grim, Robert (referee) ; Löffelmann, František (advisor)
This diploma thesis discusses the topic of a polymeric foam impact energy attenuation system for emergency recovery parachute landing. It aims to improve the crew safety during emergency landing. The thesis contains research on methods of impact energy attenuation in aerospace. Research on existing use cases of such methods and systems is included. A computational model of foambag is proposed based on study of methods of polymeric foams mechanical characteristics modelling. The computational model is capable of identifying acceptable geometrical configurations of foambag based on inserted foam parameters, aircraft parameters and impact conditions. Experimental measurement of polyurethane foam with short reaction time is conducted. Identified material characteristics are used to improve the mathematic model. Based on the results from the mathematic model using the measured foam characteristics, a conception design is proposed. Important design points are identified and two possible approaches are proposed. The thesis results in conclusion that it is possible to design working energy attenuation system based on polymeric foam. There are however problems that need to be overcome to allow for real-life application of such system. These problems include mainly securing reliable function in any appliable conditions and system maintenance.
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