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A special class of large-sized space systems is formed by transformable structures that have different configurations in transport and operating states. Transformable large-sized space structures are delivered into orbits in a folded transport state and after that they are deployed into operating position. Now problems of the mathematical modeling of deployment dynamics of such systems attract a great interest of scientists. When the structure is transformed, impact dynamic loads arise in the system elements. To ensure a smooth «controlled» opening of the transformable structures and to exclude the dynamic impact loads in their constructed elements, it is proposed to use force actuators made of material with a shape memory effect. Now, to create mechanisms with elements made of the materials with the shape memory effect, the role of experimental methods is very important. Preliminary experimental studies of the force actuator made of such material as titanium nickelide were carried out. Deformation and force characteristics of the actuator obtained in these studies prove the possibility to use it for reliable deployment of the promising transformable space structures. Based on the fulfilled theoretical and experimental studies, the mathematical model describing the force actuator functionality is proposed.

The paper presents an approach to assessing structural states of space vehicles (complex organizational and technical objects) with support of taking decisions on their life cycle control. The analysis of the subject area showed the need to apply the new intellectual information technology presented in the article to the design of both the information system of a complex organizational and technical object, and the related systems for monitoring structural states and decision support as part of such an information system. We consider a version of a generalized computational model as a theoretical basis of this technology. The version discussed is a unified knowledge representation model that integrates a number of methods and approaches of the Artificial Intelligence theory and makes it possible to construct imitation-analytical polymodel complexes for monitoring states and controlling complex organizational and technical objects. The article shows that applying this technology allows comprehensive assessment of the technical state and reliability of the monitored object. The article also provides a brief overview of the software complex that solves the problems of estimating the structural states of space vehicles. The software complex is implemented on the basis of the examined intellectual information technology.

The prospects for the development of radio astronomy, solar energy, space communications, exploration of the Earth’s surface and other planets from space are currently associated with the creation of fundamentally new large-sized space structures. The inevitable complication of the design schemes of promising large-sized systems due to the increase in their operational functionality requires the development of mathematical models that adequately describe the mechanical properties of structures. When designing large-sized systems, the scheme of which allows for automatic configuration change of the structure, it is necessary to take into account shock loads. They inevitably arise when the working state of the structure fixes in orbit upon completion of the process of its opening. To ensure smooth, reliable and shock-free opening of large-sized space structures, it is proposed to use force actuators with active elements made of titanium nickelide material with a shape memory effect. During the tests of the active elements, the main parameters of the force actuator were determined: the generated force, the actuation time and the length of the working stroke. The length of the working stroke was determined by the change in the relative elongation of the active element of the force actuator during its heating. The conducted experimental and theoretical studies are aimed at developing a mathematical model of the functioning of an active element made of titanium nickelide with a shape memory effect for the opening of a space structure with transformable configuration.

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