Method of Structural-Parametric Synthesis of Configuration Multi-Mode Object

Abstract

The complexity of modern objects with a reconfigurable structure leads to the need to take into account various factors of their interaction with the environment and is associated with an increase in the number of their constituent elements and subsystems, as well as, accordingly, a rapid increase in the number of internal connections, and manifests itself in such aspects as structural complexity, complexity of functioning, complexity of choice of behavior, complexity of modeling and complexity of development. These systems operate in conditions of significant uncertainty associated with a change in the content of the goals and objectives facing the object, the impact of disturbing factors from the external environment and having a targeted and / or non-targeted character. These aspects of the complexity of the system are associated not only with the uncertain effects of the external environment, but also with many different modes (types) of functioning, corresponding to the multiplicity of tasks being solved and the multiplicity of indicators of the quality of their solution. As a rule, systems with a fixed structure, usually tuned to a steady (some given) mode, do not provide the best control quality in other modes. Therefore, the multi-mode and uncertainty of the operating conditions necessitate solving the problem of analysis and synthesis of the configuration and reconfiguration of the objects under consideration, based on intelligent approaches. At the same time, at the stages of creating and designing objects with a tunable structure, such interconnected sets of modes of operation and structures should be synthesized, and, possibly, such a level of redundancy should be introduced into these sets, taking into account space-time, technical and technological restrictions, under which at the stage of their application for the intended purpose, it would be possible to respond flexibly to all design and off-design contingencies that cause structural changes in the object. From a formal point of view, the solution to these problems is possible within the framework of such an important class of modern scientific and technical problems as the problems of multi-criteria structural-functional synthesis of configurations of multi-mode objects at various stages of their life cycle. This article presents a method for solving these problems, based on the concept of the parametric genome of complex multi-mode objects proposed by the authors. The application of this concept makes it possible to store in a concentrated form the explicit and implicit knowledge of experts about the interaction of elements and subsystems of an object when performing various combinations of the implementation of operating modes, as well as to quickly calculate optimistic and pessimistic estimates of indicators of structural and functional reliability of homogeneous / heterogeneous, monotonous / non-monotonic, equivalent /unequal multi-mode objects. With a multi-criteria choice of the required number of non-dominated variants of configurations of a multi-mode object, evenly distributed in the set of effective (Pareto) alternatives, a combination of the method of interval lexicographic ordering (successive concessions) and an operator decision rule was proposed. At the same time, in order to conduct a detailed analysis of the possibility of implementing an object of joint or separate activation of operating modes with an equivalent or unequal intensity of their use, a fuzzy-possibility representation of a generalized indicator of structural and functional reliability in the form of a trapezoidal number and determining its center of gravity was proposed. The results of applying the developed method of structural-parametric synthesis of configurations of a multi-mode object with a tunable structure are presented on the example of the motion control system of the small spacecraft "Aist-2D".