and adjusted if necessary, through optical sightings by EVA crewmen. Flat surfaces would be utilized for all common, structural member interfaces to allow members to be shifted during final alignment prior to fastening. i. Electromagnetic Bending Forces The nature of this potential disturbance is not known, and Ref. A2 states only that more information is needed. j. Effect of Thruster Forces Ref. A2 points out the potential for localized bending due to thruster forces, but the issue does not seem to have been addressed elsewhere. In the large structures being considered, the likelihood of some such effect seems certain, particularly as high thrust propulsion mounts are used for orbital transfer. k. Docking Loads Ref. A4 states that docking loads may be a controlling force in the structural design, and that they require "considerations of aerodynamic and structural dynamic responses which are more sensitive and persistent than current experience" (sic). Ref. E4 reports on an analysis of an aluminum structure which, among other factors, considered induced loads from tug/pallet docking. This analysis seems to have indicated that such loads could be accommodated; at least it will be necessary since it will not be possible to add weight for this purpose. 1. Variations During Assembly Ref. A4 states that the dynamics of the assembly process need to be known and allowed for in the design, and that variations during assembly of mass, center of gravity, stiffness, etc., must be considered. This issue was not raised in any other document, although it is clear that problems in this area must be anticipated. m. Maintenance Provisions It is generally recognized that maintenance will be required to achieve the proposed, 30-year lifetime, and Ref. A4 states that techniques and devices need to be developed for maintenance so that it does not
RkJQdWJsaXNoZXIy MTU5NjU0Mg==