Studies to model closed loop phase front control to better estimate error budget and performance under transient conditions are required as a necessary part of this development. 5. Large Space Structures All documents examined concur that the status of technology in this area falls far short of that required for the deployment of operational SPS assemblies. A partial list of the requirements or considerations that must be addressed, together with references discussing them, can be outlined as follows: Requirements/Considerations _____Ref.____ • Material technology status E4,A4,A11,A12 (metals & composites) • Fastening/joining techniques E4,A11 • Thermal torques, especially at E4,A4,A11 eclipse • Gravity gradient torques E6,A4,A11,A12 • Micrometeorite protection A12 • Current-carrying structural A9,A11 members • Radiation damage potential A9,A12 • Alignment/adjustment provisions E4,A11 • Electromagnetic bending forces A2 • Effect of thruster forces A2,A4 • Docking loads E4,A4 • Variations during assembly of A4 mass, eg, stiffness, etc. • Maintenance provisions E4,E9,A4 • Construction approach E4,E5,E7,E9,A2, A4,A9,A11,A12,A13 In addition to such rather specific requirements/considerations as these, at least two more generalized requirements effect all large structures. These are (1) from an operational viewpoint, minimum mass per area is desirable, which is a somewhat different requirement from that of launch (maximum mass/volume) (Ref. A4 and A9); and (2) analysis of the structural
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