7. Updating of technical data documentation and supply of prototypes to be launched. A particularly important trend out of the tasks set forth is the one for developing of construction principles and creation of the ground-testing complexes for large-sized space-based engineering structures. Principles for formation and shaping of structures in external conditions. The space structure shape formation is a principal criterion for implementation of the engineering task. The shape formation process has many constraints and it is not entirely dependent upon the parameters required for the large space structure. There are many constraints however, the basic ones are as follows: • the size of the structures to be launched is limited • structures must be light-weight • shape construction processes should include a certain level of automation • open-space work of astronauts, robots or manipulators should be minimized. Optimizing tasks to be done in space is still a complex and time-consuming process. On choosing a shape formation process for a specific structure, the following possibilities (for shape formation) should be considered: • a collapsible one • a collapsible-transformable one • a transformable-collapsible one • a technological one • a solely transformable one. In most cases, an optimal combination of the different techniques will be applicable depending upon the specific task. In this direction, theoretical studies on transformable systems have been conducted to classify logical foundations for the shape formation processes with the purpose of creating a mathematical simulation and geometrical systematization of the shape formation as well as for determining the physical factors of the process (see Medzmariashvili E., Transformable systems, USSR Academy Science. Tbilisi, 1990 ). Development of the structure classes The following types of structures have been developed at the level of invention, draft designs and operating prototypes • new efficient classes of structures for a large space antenna operating within the centimeter to meter wave range, with the aerial reflector diameter of 30 m. 50 m or more • concentrators with high-precision surfaces up to 13 m in diameter
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