3.4.2 Structural Assembly A preliminary assembly sequence for the MPTS antenna follows. This assembly flow is based on the rectangular grid general arrangement, (see Fig. 3.2-1). Major functional blocks are identified in the order in which they are assembled. A top level operations analysis is presented for the following structure assembly methods: • Using manned free flying manipulator modules • Using remote controlled free flying manipulator modules • EVA using remote controlled logistics modules. The analysis has led to the following indicators: • Assembly using remote controlled manipulator modules offers the most cost effective approach • EVA assembly with remote controlled logistics modules could be cost competitive • Manned manipulator assembly tends not to be effective because of the high propellant consumption of the free flyers. 3.4.2.1 MPTS Assembly Functional Flow 3.4.2.1.1 Level 2 Assembly Flow - Figure 3.4-9 is a breakdown of the assembly steps for the MPTS antenna structure. Assembly starts with installation of the rotary joint using the SSPS central mast as a point of departure. The rotary joint to antenna interface structure assembly follows using the elevation rotary joint structure as an assembly base. Assembly of the primary and secondary structure is performed working radially from the center of the antenna. Installation of the waveguides and electronics follows. 3.4.2.1.2 Level 3 Assembly Flow - Figures 3.4-10 through 3.4-12 are more detailed definition of sequences for assembly of the rotary joints, interface structure, and antenna primary and secondary structure. Assembly of the rotary joints appears to represent the most complex assembly operation due to the number of unique installations (gears, flex harnesses, etc.). Assembly of the antenna itself along with waveguides and electronics, is a repetitive operation and should not pose difficult problems.
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