subjected to mechanical and electrical tests in the immediate future (Figure 9.10b) [Bemasconi, M. C. 1984]. Figure 9.10 (a) Modularized Inflatable (b) Rigidized Inflatable [Kato et. al. 1989] [Miura et. al. 1986] Relative to other structural concepts, adaptive trusses are new to space structures (Figure 9.11). The basic premise is to vary the geometrical configuration of the truss by automatic extension and contraction of specific members for deployment and arbitrary change. These structures are studied for their application to docking structures, space cranes and the control of the shape of antenna structures. Conclusions As the need of large scale structures becomes a reality in space solar power, there will be the need of further development of deployable high-precision elements. Considerations of packaging efficiency, manner of deployment, and the number of joints in the system are equally important. Efficient packaging will minimize the number of space flights, while reducing the number of hinges and nodes is highly desirable for reliability and accuracy. Many times these systems will conflict with each other, therefore, it is important to have many deployable concepts available for space applications [Natori, Miura, 1985]. Our ability to develop these technologies should not limit the experiments that can be done quicker and cheaper to explore fundamental scientific questions. Nevertheless, construction and manufacturing technologies must be ready when the larger systems call upon them. Table 9.6 Advantages and Disadvantages Advantages of Deployable Structures Disadvantages of Deployable Structures Minimum human interfacing required Decrease in structural stiffness Structures require min. payload area Difficulties in terrestrial testing Easy transport Lack of structural accuracy Membranes require no mechanisms Require high-precision elements
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