to be used and the equipment required. Analogous estimates use comparisons with past programs. This method requires historical cost data and the exercise of judgment to determine a representative program for comparison and adjustment for varying complexity factors. Parametric estimates use mathematical formulas based on significant variables related to physical or performance characteristics of the system. Since there is no historical data based for space antennas, a combination of grass roots and analogous techniques is required to develop cost estimates. A baseline design is required which is sufficiently detailed to determine the cost drivers and major cost elements. These can then be related to cost data on fabrication, assembly, and erection for large aluminum structures or ground based antennas. 4.4.1.2 Desired Outputs • Baseline design to determine: - Element fabrication method - Joint design - Materials - Assembly and erection procedures - Packaging and delivery techniques - Alignment procedures - Tooling and equipment requirements - Facility requirements • Analysis of cost data for erection of representative aluminum structures • Preliminary plan for manufacture on earth • Analysis of space assembly techniques • Analysis of astronaut capabilities to perform assembly tasks • Analysis of special equipment requirements. 4.4.2 Man's Role in Assembly and Maintenance The Apollo and Skylab programs demonstrated man's capability to work successfully in zero gravity. Future work in space will require teams of men to assemble enormous structures across vast areas over weeks or months. The jobs that man can and must do in the transport, assembly, positioning and maintenance of the MPTS need to be identified. The equipment needed for these jobs and the design of the MPTS to aid job conduct strongly influences the operational concepts selected.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==