8.58 A suggested organizational chart of this work force is shown in Figure 8.13. These figures are for peak employment. In the first phase of colony construction site assembly, an initial work force of about 50 would be needed, growing over the next several years to the full figure of 140-160 people. The productivity of this work force is quite high. They produce and assemble one 20m x 20m section every 16.9 working hours followed by a Sm x 20m bulkhead in the next 16.9 working hours. This represents a total output of about 118 tons every 33.8 working hours, or an average of 3.49 tons per working hour. Firty-three people work at any one time at peak employment, so this is 65.8 kg per man-hour during actual production. Since the work force is on an 80% duty cycle (production takes place only 80% of the time), this corresponds to an overall productivity of 52.7 kg/man-hour. VIII.9.2: Mass and Power Consumption: Table 8.3 presents a summary of the power consumption and mass of the elements of the colony construction site. VIII.10 CONCLUSIONS A.~D RECOMMENDATIONS 1. Using the procedure_outlined in this chapter, based on current technology, a peak work force of 140-160 people can construct the prototype colony in five years. 2. While a refining process is proposed which seems workable, the refinery process, equipment, and geometry require further study. 3. Existing machine tools are used in the layout of the manufacturing process. Reduction of equipment mass by improved technology is not likely to be significant, since the machines are sized according to accelerations of the work piece and tool to work piece interaction forces. These severe transient stresses and their associated fatigue problems imply that space-applied machines are comparable in mass to their Earth counterparts. 4. The fabrication process (which employs electron beam welding) is the rate limiting step in the overall construction scenario. As a result, the manufacturing facility is not used to its capacity and its output could be expanded to produce other products either
RkJQdWJsaXNoZXIy MTU5NjU0Mg==