Tailored Dynamic Characteristics for Membrane and Inflatable Structures

The goal of the proposed work is the development of an unified framework ofanalytical and testing tools, proven energy dissipation mechanisms, andsystem level approaches that will enable membrane and inflatable (M/I)structures designers to confidently predict and achieve the desiredstructural dynamic characteristics. In Phase 1, the efforts required toestablish the feasibility of previously undeveloped key portions of thisoverall framework are proposed. These efforts include: 1) the developmentof new membrane material energy dissipation property test methods, 2)demonstrating structural energy dissipation mechanisms for use on M/Istructures as needed, and 3) developing the analytical methodology requiredto accurately predict the response of M/I structures to realisticdisturbance loads. The motivation for this work comes from several areas.First, M/I structures, being optimized for minimal weight through thereduction of load bearing material structures, are highly stressed. Thusany additional dynamic stresses can lead to eventual fatigue failures.Secondly, unknown structural dynamics can lead to control structureinteraction and the possible loss of the spacecraft. Finally, structuraldynamics with long settling times can cause degradation in missionperformance. The proposed efforts will help remove such uncertainties andlead to improved/optimal M/I structure designs.