station build-up [5]. The specification of appropriate capability to support the construction operation is a significant factor in the integration of this type of tool into the process. The combination of the assembly work platform and the Shuttle have similar functions to the construction base for the SPS (Fig. 7). The mobile transporter is a device that moves around the truss for logistics and manipulation support on the completed station. The transporter is initially used as a major component of the work platform. The RMS provides part of the mobility and astronaut translation aids allow the EVA astronauts access to tasks during assembly. Conclusions Progress in the space program since the SPS studies has shown some benefit from the extensive analysis of construction of large systems. In other instances the effects of detailed implementation of requirements and the influence of operational approaches has modified the course of evolution of construction capabilities. Satellite servicing successes with EVA provided management confidence in the ability to perform construction type tasks on orbit. This confidence biased the assembly of space station toward an EVA-intensive initial approach. Greater emphasis on designing for assembly or construction in addition to function would have provided earlier focus on viable SSF configurations. Future large systems such as a space power facility must bring construction considerations into the program early with equal status to other system requirements. REFERENCES [1] Benson & Jenkins (1981) Satellite Power System Concept Development and Evaluation Program, NASA Technical Memorandum 58233, April, Volume VI.
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