4.1.2.2 Desired Output • Detailed control system design • In-depth stability analysis • Pointing accuracy sensitivity to configuration uncertainties • Full 3-dimensional math-model simulation demonstration. 4.2 STRUCTURAL SYSTEM 4.2.1 Composite Structures and Assembly Techniques The attractive combination of strength and mass properties peculiar to advanced composites makes these materials strong candidates for the antenna structure. High strength, stiffness, and low thermal expansion are desirable properties. The initial studies of the MTPS shows these materials to be cost competitive. 4.2.1.1 Background Up to this time much of the mechanical properties data for advanced composites have been established for short-duration aircraft and spacecraft missions. The antenna structural designs would employ composites in much thinner gauges than has been normally used. Development of mechanical properties in thin sections (5 mil range) must be verified. Durability of organic matrix materials in orbit must be reliably predicted based on sound test data. These verification tests for long-duration life times (30 years) must be initiated as soon as possible. Methods of assembty and manufacture in space must be evaluated to determine overall feasibility of composites to MTPS application. Creep fatigue from thermal cycling in a space environment should be a long-term advanced study for these materials. Bonding methods used to join members in a space environment needs definition. 4.2.1.2 Desired Output • Sufficient data to support design of MTPS structure using thin members in a geosynchronous altitude environment for a 30-year period. This data should determine materials strength degradation due to fatigue, radiation, temperature and outgassing • Methods for manufacture in space. Low cost methods of transporting raw materials to a space-based factory and subsequent automatic manufacture of basic structural elements • Methods of joining and bonding basic structural elements into large structure.
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